repos/blastem: png.c annotate

annotate png.c @ 2019:81eebbe6b2e3

Fix some bugs in PNG decoder

author	Michael Pavone <pavone@retrodev.com>
date	Sat, 21 Nov 2020 22:55:40 -0800
parents	31effaadf877
children	eb45ad9d8a3f

rev	line source
1532 b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	1 #include <stdint.h>
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	2 #include <stdlib.h>
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	3 #include <stdio.h>
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	4 #include <string.h>
1532 b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	5 #include "zlib/zlib.h"
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	6
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	7 static const char png_magic[] = {0x89, 'P', 'N', 'G', '\r', '\n', 0x1A, '\n'};
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	8 static const char ihdr[] = {'I', 'H', 'D', 'R'};
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	9 static const char plte[] = {'P', 'L', 'T', 'E'};
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	10 static const char idat[] = {'I', 'D', 'A', 'T'};
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	11 static const char iend[] = {'I', 'E', 'N', 'D'};
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	12
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	13 enum {
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	14 COLOR_GRAY,
1532 b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	15 COLOR_TRUE = 2,
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	16 COLOR_INDEXED,
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	17 COLOR_GRAY_ALPHA,
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	18 COLOR_TRUE_ALPHA=6
1532 b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	19 };
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	20
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	21 static void write_chunk(FILE f, const charid, uint8_t *buffer, uint32_t size)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	22 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	23 uint8_t tmp[4] = {size >> 24, size >> 16, size >> 8, size};
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	24 uint8_t warn = 0;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	25 warn = warn \|\| (sizeof(tmp) != fwrite(tmp, 1, sizeof(tmp), f));
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	26 warn = warn \|\| (4 != fwrite(id, 1, 4, f));
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	27 if (size) {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	28 warn = warn \|\| (size != fwrite(buffer, 1, size, f));
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	29 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	30
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	31 uint32_t crc = crc32(0, NULL, 0);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	32 crc = crc32(crc, id, 4);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	33 if (size) {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	34 crc = crc32(crc, buffer, size);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	35 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	36 tmp[0] = crc >> 24;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	37 tmp[1] = crc >> 16;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	38 tmp[2] = crc >> 8;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	39 tmp[3] = crc;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	40 warn = warn \|\| (sizeof(tmp) != fwrite(tmp, 1, sizeof(tmp), f));
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	41 if (warn) {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	42 fprintf(stderr, "Failure during write of %c%c%c%c chunk\n", id[0], id[1], id[2], id[3]);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	43 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	44 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	45
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	46 static void write_header(FILE *f, uint32_t width, uint32_t height, uint8_t color_type)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	47 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	48 uint8_t chunk[13] = {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	49 width >> 24, width >> 16, width >> 8, width,
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	50 height >> 24, height >> 16, height >> 8, height,
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	51 8, color_type, 0, 0, 0
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	52 };
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	53 if (sizeof(png_magic) != fwrite(png_magic, 1, sizeof(png_magic), f)) {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	54 fputs("Error writing PNG magic\n", stderr);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	55 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	56 write_chunk(f, ihdr, chunk, sizeof(chunk));
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	57 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	58
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	59 void save_png24(FILE f, uint32_t buffer, uint32_t width, uint32_t height, uint32_t pitch)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	60 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	61 uint32_t idat_size = (1 + width3) height;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	62 uint8_t *idat_buffer = malloc(idat_size);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	63 uint32_t *pixel = buffer;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	64 uint8_t *cur = idat_buffer;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	65 for (uint32_t y = 0; y < height; y++)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	66 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	67 //save filter type
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	68 *(cur++) = 0;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	69 uint32_t *start = pixel;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	70 for (uint32_t x = 0; x < width; x++, pixel++)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	71 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	72 uint32_t value = *pixel;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	73 *(cur++) = value >> 16;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	74 *(cur++) = value >> 8;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	75 *(cur++) = value;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	76 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	77 pixel = start + pitch / sizeof(uint32_t);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	78 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	79 write_header(f, width, height, COLOR_TRUE);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	80 uLongf compress_buffer_size = idat_size + 5 * (idat_size/16383 + 1) + 3;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	81 uint8_t *compressed = malloc(compress_buffer_size);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	82 compress(compressed, &compress_buffer_size, idat_buffer, idat_size);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	83 free(idat_buffer);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	84 write_chunk(f, idat, compressed, compress_buffer_size);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	85 write_chunk(f, iend, NULL, 0);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	86 free(compressed);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	87 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	88
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	89 void save_png(FILE f, uint32_t buffer, uint32_t width, uint32_t height, uint32_t pitch)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	90 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	91 uint32_t palette[256];
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	92 uint8_t pal_buffer[256*3];
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	93 uint32_t num_pal = 0;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	94 uint32_t index_size = (1 + width) * height;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	95 uint8_t *index_buffer = malloc(index_size);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	96 uint8_t *cur = index_buffer;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	97 uint32_t *pixel = buffer;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	98 for (uint32_t y = 0; y < height; y++)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	99 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	100 //save filter type
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	101 *(cur++) = 0;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	102 uint32_t *start = pixel;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	103 for (uint32_t x = 0; x < width; x++, pixel++, cur++)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	104 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	105 uint32_t value = (*pixel) & 0xFFFFFF;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	106 uint32_t i;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	107 for (i = 0; i < num_pal; i++)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	108 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	109 if (palette[i] == value) {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	110 break;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	111 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	112 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	113 if (i == num_pal) {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	114 if (num_pal == 256) {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	115 free(index_buffer);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	116 save_png24(f, buffer, width, height, pitch);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	117 return;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	118 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	119 palette[i] = value;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	120 num_pal++;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	121 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	122 *cur = i;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	123 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	124 pixel = start + pitch / sizeof(uint32_t);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	125 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	126 write_header(f, width, height, COLOR_INDEXED);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	127 cur = pal_buffer;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	128 for (uint32_t i = 0; i < num_pal; i++)
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	129 {
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	130 *(cur++) = palette[i] >> 16;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	131 *(cur++) = palette[i] >> 8;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	132 *(cur++) = palette[i];
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	133 }
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	134 write_chunk(f, plte, pal_buffer, num_pal * 3);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	135 uLongf compress_buffer_size = index_size + 5 * (index_size/16383 + 1) + 3;
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	136 uint8_t *compressed = malloc(compress_buffer_size);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	137 compress(compressed, &compress_buffer_size, index_buffer, index_size);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	138 free(index_buffer);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	139 write_chunk(f, idat, compressed, compress_buffer_size);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	140 write_chunk(f, iend, NULL, 0);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	141 free(compressed);
b505083dcd87 Added png screenshot support Michael Pavone <pavone@retrodev.com> parents: diff changeset	142 }
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	143
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	144 typedef uint8_t (filter_fun)(uint8_t cur, uint8_t *last, uint8_t bpp, uint32_t x);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	145 typedef uint32_t (pixel_fun)(uint8_t cur, uint8_t *last, uint8_t bpp, uint32_t x, filter_fun);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	146
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	147 static uint8_t filter_none(uint8_t cur, uint8_t last, uint8_t bpp, uint32_t x)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	148 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	149 return *cur;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	150 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	151
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	152 static uint8_t filter_sub(uint8_t cur, uint8_t last, uint8_t bpp, uint32_t x)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	153 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	154 if (x) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	155 return cur + (cur - bpp);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	156 } else {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	157 return *cur;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	158 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	159 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	160
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	161 static uint8_t filter_up(uint8_t cur, uint8_t last, uint8_t bpp, uint32_t x)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	162 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	163 if (last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	164 return cur + last;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	165 } else {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	166 return *cur;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	167 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	168 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	169
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	170 static uint8_t filter_avg(uint8_t cur, uint8_t last, uint8_t bpp, uint32_t x)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	171 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	172 uint8_t prev = x ? *(cur - bpp) : 0;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	173 uint8_t prior = last ? *last : 0;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	174 return *cur + ((prev + prior) >> 1);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	175 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	176
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	177 static uint8_t paeth(uint8_t a, uint8_t b, uint8_t c)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	178 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	179 int32_t p = a + b - c;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	180 int32_t pa = abs(p - a);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	181 int32_t pb = abs(p - b);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	182 int32_t pc = abs(p - c);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	183 if (pa <= pb && pa <= pc) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	184 return a;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	185 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	186 if (pb <= pc) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	187 return b;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	188 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	189 return c;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	190 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	191
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	192 static uint8_t filter_paeth(uint8_t cur, uint8_t last, uint8_t bpp, uint32_t x)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	193 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	194 uint8_t prev, prev_prior;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	195 if (x) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	196 prev = *(cur - bpp);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	197 prev_prior = *(last - bpp);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	198 } else {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	199 prev = prev_prior = 0;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	200 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	201 uint8_t prior = last ? *last : 0;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	202 return *cur + paeth(prev, prior, prev_prior);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	203 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	204
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	205 static uint32_t pixel_gray(uint8_t cur, uint8_t last, uint8_t bpp, uint32_t x, filter_fun filter)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	206 {
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	207 uint8_t value = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	208 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	209 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	210 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	211 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	212 return 0xFF000000 \| value << 16 \| value << 8 \| value;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	213 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	214
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	215 static uint32_t pixel_true(uint8_t cur, uint8_t last, uint8_t bpp, uint32_t x, filter_fun filter)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	216 {
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	217 uint8_t red = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	218 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	219 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	220 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	221 }
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	222 uint8_t green = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	223 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	224 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	225 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	226 }
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	227 uint8_t blue = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	228 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	229 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	230 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	231 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	232 return 0xFF000000 \| red << 16 \| green << 8 \| blue;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	233 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	234
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	235 static uint32_t pixel_gray_alpha(uint8_t cur, uint8_t last, uint8_t bpp, uint32_t x, filter_fun filter)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	236 {
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	237 uint8_t value = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	238 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	239 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	240 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	241 }
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	242 uint8_t alpha = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	243 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	244 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	245 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	246 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	247 return alpha << 24 \| value << 16 \| value << 8 \| value;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	248 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	249
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	250 static uint32_t pixel_true_alpha(uint8_t cur, uint8_t last, uint8_t bpp, uint32_t x, filter_fun filter)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	251 {
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	252 uint8_t red = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	253 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	254 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	255 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	256 }
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	257 uint8_t green = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	258 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	259 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	260 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	261 }
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	262 uint8_t blue = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	263 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	264 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	265 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	266 }
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	267 uint8_t alpha = *cur = filter(cur, *last, bpp, x);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	268 (*cur)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	269 if (*last) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	270 (*last)++;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	271 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	272 return alpha << 24 \| red << 16 \| green << 8 \| blue;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	273 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	274
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	275 static filter_fun filters[] = {filter_none, filter_sub, filter_up, filter_avg, filter_paeth};
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	276
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	277 #define MIN_CHUNK_SIZE 12
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	278 #define MIN_IHDR_SIZE 0xD
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	279 #define MAX_SUPPORTED_DIM 32767 //chosen to avoid possibility of overflow when calculating uncompressed size
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	280 uint32_t load_png(uint8_t buffer, uint32_t buf_size, uint32_t width, uint32_t height)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	281 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	282 if (buf_size < sizeof(png_magic) \|\| memcmp(buffer, png_magic, sizeof(png_magic))) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	283 return NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	284 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	285 uint32_t cur = sizeof(png_magic);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	286 uint8_t has_header = 0;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	287 uint8_t bits, color_type, comp_type, filter_type, interlace;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	288 uint8_t *idat_buf = NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	289 uint8_t idat_needs_free = 0;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	290 uint32_t idat_size;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	291 uint32_t *out = NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	292 uint32_t *palette = NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	293 while(cur + MIN_CHUNK_SIZE <= buf_size)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	294 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	295 uint32_t chunk_size = buffer[cur++] << 24;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	296 chunk_size \|= buffer[cur++] << 16;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	297 chunk_size \|= buffer[cur++] << 8;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	298 chunk_size \|= buffer[cur++];
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	299 if (!memcmp(ihdr, buffer + cur, sizeof(ihdr))) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	300 if (chunk_size < MIN_IHDR_SIZE \|\| cur + MIN_IHDR_SIZE > buf_size) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	301 return NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	302 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	303 cur += sizeof(ihdr);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	304 *width = buffer[cur++] << 24;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	305 *width \|= buffer[cur++] << 16;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	306 *width \|= buffer[cur++] << 8;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	307 *width \|= buffer[cur++];
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	308 *height = buffer[cur++] << 24;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	309 *height \|= buffer[cur++] << 16;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	310 *height \|= buffer[cur++] << 8;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	311 *height \|= buffer[cur++];
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	312 if (width > MAX_SUPPORTED_DIM \|\| height > MAX_SUPPORTED_DIM) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	313 return NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	314 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	315 bits = buffer[cur++];
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	316 if (bits != 8) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	317 //only support 8-bits per element for now
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	318 return NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	319 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	320 color_type = buffer[cur++];
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	321 if (color_type > COLOR_TRUE_ALPHA \|\| color_type == 1 \|\| color_type == 5) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	322 //reject invalid color type
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	323 return NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	324 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	325 comp_type = buffer[cur++];
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	326 if (comp_type) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	327 //only compression type 0 is defined by the spec
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	328 return NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	329 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	330 filter_type = buffer[cur++];
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	331 interlace = buffer[cur++];
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	332 if (interlace) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	333 //interlacing not supported for now
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	334 return NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	335 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	336 cur += chunk_size - MIN_IHDR_SIZE;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	337 has_header = 1;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	338 } else {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	339 if (!has_header) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	340 //IHDR is required to be the first chunk, fail if it isn't
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	341 break;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	342 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	343 if (!memcmp(plte, buffer + cur, sizeof(plte))) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	344 //TODO: implement paletted images
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	345 } else if (!memcmp(idat, buffer + cur, sizeof(idat))) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	346 cur += sizeof(idat);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	347 if (idat_buf) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	348 if (idat_needs_free) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	349 idat_buf = realloc(idat_buf, idat_size + chunk_size);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	350 } else {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	351 uint8_t *tmp = idat_buf;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	352 idat_buf = malloc(idat_size + chunk_size);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	353 memcpy(idat_buf, tmp, idat_size);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	354 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	355 memcpy(idat_buf + idat_size, buffer + cur, chunk_size);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	356 idat_size += chunk_size;
2019 81eebbe6b2e3 Fix some bugs in PNG decoder Michael Pavone <pavone@retrodev.com> parents: 1592 diff changeset	357 idat_needs_free = 1;
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	358 } else {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	359 idat_buf = buffer + cur;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	360 idat_size = chunk_size;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	361 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	362 cur += chunk_size;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	363 } else if (!memcmp(iend, buffer + cur, sizeof(iend))) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	364 if (!idat_buf) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	365 break;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	366 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	367 if (!palette && color_type == COLOR_INDEXED) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	368 //indexed color, but no PLTE chunk found
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	369 return NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	370 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	371 uLongf uncompressed_size = width *height;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	372 uint8_t bpp;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	373 pixel_fun pixel;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	374 switch (color_type)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	375 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	376 case COLOR_GRAY:
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	377 uncompressed_size *= bits / 8;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	378 bpp = bits/8;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	379 pixel = pixel_gray;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	380 break;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	381 case COLOR_TRUE:
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	382 uncompressed_size = 3 bits / 8;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	383 bpp = 3 * bits/8;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	384 pixel = pixel_true;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	385 break;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	386 case COLOR_INDEXED: {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	387 uint32_t pixels_per_byte = 8 / bits;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	388 uncompressed_size = (width / pixels_per_byte) *height;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	389 if (*width % pixels_per_byte) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	390 uncompressed_size += *height;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	391 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	392 bpp = 1;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	393 break;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	394 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	395 case COLOR_GRAY_ALPHA:
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	396 uncompressed_size *= bits / 4;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	397 bpp = bits / 4;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	398 pixel = pixel_gray_alpha;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	399 break;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	400 case COLOR_TRUE_ALPHA:
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	401 uncompressed_size *= bits / 2;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	402 bpp = bits / 2;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	403 pixel = pixel_true_alpha;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	404 break;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	405 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	406 //add filter type byte
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	407 uncompressed_size += *height;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	408 uint8_t *decomp_buffer = malloc(uncompressed_size);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	409 if (Z_OK != uncompress(decomp_buffer, &uncompressed_size, idat_buf, idat_size)) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	410 free(decomp_buffer);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	411 break;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	412 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	413 out = calloc(width *height, sizeof(uint32_t));
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	414 uint32_t *cur_pixel = out;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	415 uint8_t *cur_byte = decomp_buffer;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	416 uint8_t *last_line = NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	417 for (uint32_t y = 0; y < *height; y++)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	418 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	419 uint8_t filter_type = *(cur_byte++);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	420 if (filter_type >= sizeof(filters)/sizeof(*filters)) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	421 free(out);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	422 out = NULL;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	423 free(decomp_buffer);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	424 break;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	425 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	426 filter_fun filter = filters[filter_type];
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	427 uint8_t *line_start = cur_byte;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	428 for (uint32_t x = 0; x < *width; x++)
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	429 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	430 *(cur_pixel++) = pixel(&cur_byte, &last_line, bpp, x, filter);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	431 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	432 last_line = line_start;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	433 }
1592 31effaadf877 Fix some memory errors (mostly leaks) identified by valgrind Michael Pavone <pavone@retrodev.com> parents: 1569 diff changeset	434 free(decomp_buffer);
1569 0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	435 } else {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	436 //skip uncrecognized chunks
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	437 cur += 4 + chunk_size;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	438 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	439 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	440 //skip CRC for now
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	441 cur += sizeof(uint32_t);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	442 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	443 if (idat_needs_free) {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	444 free(idat_buf);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	445 }
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	446 free(palette);
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	447 return out;
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI Michael Pavone <pavone@retrodev.com> parents: 1532 diff changeset	448 }

Mercurial > repos > blastem

annotate png.c @ 2019:81eebbe6b2e3