annotate png.c @ 2208:3809a0bd680e

Fix a couple of Z80 debugger issues
author Michael Pavone <pavone@retrodev.com>
date Sat, 27 Aug 2022 22:02:09 -0700
parents 81eebbe6b2e3
children eb45ad9d8a3f
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1 #include <stdint.h>
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2 #include <stdlib.h>
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3 #include <stdio.h>
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4 #include <string.h>
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5 #include "zlib/zlib.h"
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6
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7 static const char png_magic[] = {0x89, 'P', 'N', 'G', '\r', '\n', 0x1A, '\n'};
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8 static const char ihdr[] = {'I', 'H', 'D', 'R'};
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9 static const char plte[] = {'P', 'L', 'T', 'E'};
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10 static const char idat[] = {'I', 'D', 'A', 'T'};
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11 static const char iend[] = {'I', 'E', 'N', 'D'};
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12
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13 enum {
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14 COLOR_GRAY,
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15 COLOR_TRUE = 2,
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16 COLOR_INDEXED,
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17 COLOR_GRAY_ALPHA,
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18 COLOR_TRUE_ALPHA=6
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19 };
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20
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21 static void write_chunk(FILE *f, const char*id, uint8_t *buffer, uint32_t size)
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22 {
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23 uint8_t tmp[4] = {size >> 24, size >> 16, size >> 8, size};
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24 uint8_t warn = 0;
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25 warn = warn || (sizeof(tmp) != fwrite(tmp, 1, sizeof(tmp), f));
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26 warn = warn || (4 != fwrite(id, 1, 4, f));
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27 if (size) {
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28 warn = warn || (size != fwrite(buffer, 1, size, f));
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29 }
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30
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31 uint32_t crc = crc32(0, NULL, 0);
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32 crc = crc32(crc, id, 4);
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33 if (size) {
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34 crc = crc32(crc, buffer, size);
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35 }
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36 tmp[0] = crc >> 24;
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37 tmp[1] = crc >> 16;
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38 tmp[2] = crc >> 8;
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39 tmp[3] = crc;
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40 warn = warn || (sizeof(tmp) != fwrite(tmp, 1, sizeof(tmp), f));
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41 if (warn) {
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42 fprintf(stderr, "Failure during write of %c%c%c%c chunk\n", id[0], id[1], id[2], id[3]);
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43 }
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44 }
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46 static void write_header(FILE *f, uint32_t width, uint32_t height, uint8_t color_type)
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47 {
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48 uint8_t chunk[13] = {
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49 width >> 24, width >> 16, width >> 8, width,
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50 height >> 24, height >> 16, height >> 8, height,
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51 8, color_type, 0, 0, 0
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52 };
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53 if (sizeof(png_magic) != fwrite(png_magic, 1, sizeof(png_magic), f)) {
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54 fputs("Error writing PNG magic\n", stderr);
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55 }
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56 write_chunk(f, ihdr, chunk, sizeof(chunk));
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57 }
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58
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59 void save_png24(FILE *f, uint32_t *buffer, uint32_t width, uint32_t height, uint32_t pitch)
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60 {
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61 uint32_t idat_size = (1 + width*3) * height;
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62 uint8_t *idat_buffer = malloc(idat_size);
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63 uint32_t *pixel = buffer;
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64 uint8_t *cur = idat_buffer;
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65 for (uint32_t y = 0; y < height; y++)
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66 {
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67 //save filter type
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68 *(cur++) = 0;
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69 uint32_t *start = pixel;
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70 for (uint32_t x = 0; x < width; x++, pixel++)
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71 {
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72 uint32_t value = *pixel;
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73 *(cur++) = value >> 16;
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74 *(cur++) = value >> 8;
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75 *(cur++) = value;
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76 }
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77 pixel = start + pitch / sizeof(uint32_t);
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78 }
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79 write_header(f, width, height, COLOR_TRUE);
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80 uLongf compress_buffer_size = idat_size + 5 * (idat_size/16383 + 1) + 3;
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81 uint8_t *compressed = malloc(compress_buffer_size);
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82 compress(compressed, &compress_buffer_size, idat_buffer, idat_size);
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83 free(idat_buffer);
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84 write_chunk(f, idat, compressed, compress_buffer_size);
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85 write_chunk(f, iend, NULL, 0);
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86 free(compressed);
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87 }
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88
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89 void save_png(FILE *f, uint32_t *buffer, uint32_t width, uint32_t height, uint32_t pitch)
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90 {
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91 uint32_t palette[256];
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92 uint8_t pal_buffer[256*3];
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93 uint32_t num_pal = 0;
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94 uint32_t index_size = (1 + width) * height;
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95 uint8_t *index_buffer = malloc(index_size);
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96 uint8_t *cur = index_buffer;
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97 uint32_t *pixel = buffer;
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98 for (uint32_t y = 0; y < height; y++)
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99 {
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100 //save filter type
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101 *(cur++) = 0;
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102 uint32_t *start = pixel;
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103 for (uint32_t x = 0; x < width; x++, pixel++, cur++)
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104 {
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105 uint32_t value = (*pixel) & 0xFFFFFF;
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106 uint32_t i;
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107 for (i = 0; i < num_pal; i++)
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108 {
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109 if (palette[i] == value) {
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110 break;
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111 }
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112 }
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113 if (i == num_pal) {
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114 if (num_pal == 256) {
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115 free(index_buffer);
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116 save_png24(f, buffer, width, height, pitch);
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117 return;
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118 }
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119 palette[i] = value;
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120 num_pal++;
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121 }
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122 *cur = i;
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123 }
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124 pixel = start + pitch / sizeof(uint32_t);
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125 }
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126 write_header(f, width, height, COLOR_INDEXED);
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127 cur = pal_buffer;
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128 for (uint32_t i = 0; i < num_pal; i++)
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129 {
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130 *(cur++) = palette[i] >> 16;
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131 *(cur++) = palette[i] >> 8;
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132 *(cur++) = palette[i];
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133 }
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134 write_chunk(f, plte, pal_buffer, num_pal * 3);
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135 uLongf compress_buffer_size = index_size + 5 * (index_size/16383 + 1) + 3;
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136 uint8_t *compressed = malloc(compress_buffer_size);
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137 compress(compressed, &compress_buffer_size, index_buffer, index_size);
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138 free(index_buffer);
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139 write_chunk(f, idat, compressed, compress_buffer_size);
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140 write_chunk(f, iend, NULL, 0);
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141 free(compressed);
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142 }
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144 typedef uint8_t (*filter_fun)(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x);
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145 typedef uint32_t (*pixel_fun)(uint8_t **cur, uint8_t **last, uint8_t bpp, uint32_t x, filter_fun);
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146
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147 static uint8_t filter_none(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x)
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148 {
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149 return *cur;
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150 }
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151
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diff changeset
152 static uint8_t filter_sub(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x)
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153 {
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diff changeset
154 if (x) {
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diff changeset
155 return *cur + *(cur - bpp);
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156 } else {
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diff changeset
157 return *cur;
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diff changeset
158 }
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Michael Pavone <pavone@retrodev.com>
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diff changeset
159 }
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Michael Pavone <pavone@retrodev.com>
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diff changeset
160
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diff changeset
161 static uint8_t filter_up(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x)
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diff changeset
162 {
0ec89dadb36d Add code for loading PNG images. Added 360 controller image. WIP work on gamepad mapping UI
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diff changeset
163 if (last) {
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diff changeset
164 return *cur + *last;
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165 } else {
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diff changeset
166 return *cur;
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Michael Pavone <pavone@retrodev.com>
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167 }
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diff changeset
168 }
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Michael Pavone <pavone@retrodev.com>
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diff changeset
169
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diff changeset
170 static uint8_t filter_avg(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x)
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171 {
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diff changeset
172 uint8_t prev = x ? *(cur - bpp) : 0;
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173 uint8_t prior = last ? *last : 0;
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174 return *cur + ((prev + prior) >> 1);
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175 }
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diff changeset
176
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Michael Pavone <pavone@retrodev.com>
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diff changeset
177 static uint8_t paeth(uint8_t a, uint8_t b, uint8_t c)
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178 {
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diff changeset
179 int32_t p = a + b - c;
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180 int32_t pa = abs(p - a);
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181 int32_t pb = abs(p - b);
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182 int32_t pc = abs(p - c);
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183 if (pa <= pb && pa <= pc) {
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diff changeset
184 return a;
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185 }
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Michael Pavone <pavone@retrodev.com>
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186 if (pb <= pc) {
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diff changeset
187 return b;
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188 }
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Michael Pavone <pavone@retrodev.com>
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diff changeset
189 return c;
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Michael Pavone <pavone@retrodev.com>
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diff changeset
190 }
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Michael Pavone <pavone@retrodev.com>
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diff changeset
191
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Michael Pavone <pavone@retrodev.com>
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diff changeset
192 static uint8_t filter_paeth(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x)
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diff changeset
193 {
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diff changeset
194 uint8_t prev, prev_prior;
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Michael Pavone <pavone@retrodev.com>
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diff changeset
195 if (x) {
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diff changeset
196 prev = *(cur - bpp);
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diff changeset
197 prev_prior = *(last - bpp);
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diff changeset
198 } else {
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diff changeset
199 prev = prev_prior = 0;
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Michael Pavone <pavone@retrodev.com>
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diff changeset
200 }
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Michael Pavone <pavone@retrodev.com>
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diff changeset
201 uint8_t prior = last ? *last : 0;
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diff changeset
202 return *cur + paeth(prev, prior, prev_prior);
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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>
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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>
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diff changeset
206 {
2019
81eebbe6b2e3 Fix some bugs in PNG decoder
Michael Pavone <pavone@retrodev.com>
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diff changeset
207 uint8_t value = **cur = filter(*cur, *last, bpp, x);
1569
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Michael Pavone <pavone@retrodev.com>
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diff changeset
208 (*cur)++;
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Michael Pavone <pavone@retrodev.com>
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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>
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diff changeset
210 (*last)++;
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Michael Pavone <pavone@retrodev.com>
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diff changeset
211 }
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Michael Pavone <pavone@retrodev.com>
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diff changeset
212 return 0xFF000000 | value << 16 | value << 8 | value;
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Michael Pavone <pavone@retrodev.com>
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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>
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diff changeset
214
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Michael Pavone <pavone@retrodev.com>
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diff changeset
215 static uint32_t pixel_true(uint8_t **cur, uint8_t **last, uint8_t bpp, uint32_t x, filter_fun filter)
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Michael Pavone <pavone@retrodev.com>
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diff changeset
216 {
2019
81eebbe6b2e3 Fix some bugs in PNG decoder
Michael Pavone <pavone@retrodev.com>
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diff changeset
217 uint8_t red = **cur = filter(*cur, *last, bpp, x);
1569
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Michael Pavone <pavone@retrodev.com>
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diff changeset
218 (*cur)++;
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Michael Pavone <pavone@retrodev.com>
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diff changeset
219 if (*last) {
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Michael Pavone <pavone@retrodev.com>
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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>
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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) {
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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>
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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>
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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
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diff changeset
275 static filter_fun filters[] = {filter_none, filter_sub, filter_up, filter_avg, filter_paeth};
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diff changeset
276
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diff changeset
277 #define MIN_CHUNK_SIZE 12
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diff changeset
278 #define MIN_IHDR_SIZE 0xD
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diff changeset
279 #define MAX_SUPPORTED_DIM 32767 //chosen to avoid possibility of overflow when calculating uncompressed size
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diff changeset
280 uint32_t *load_png(uint8_t *buffer, uint32_t buf_size, uint32_t *width, uint32_t *height)
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diff changeset
281 {
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diff changeset
282 if (buf_size < sizeof(png_magic) || memcmp(buffer, png_magic, sizeof(png_magic))) {
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diff changeset
283 return NULL;
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parents: 1532
diff changeset
284 }
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diff changeset
285 uint32_t cur = sizeof(png_magic);
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diff changeset
286 uint8_t has_header = 0;
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diff changeset
287 uint8_t bits, color_type, comp_type, filter_type, interlace;
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diff changeset
288 uint8_t *idat_buf = NULL;
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diff changeset
289 uint8_t idat_needs_free = 0;
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diff changeset
290 uint32_t idat_size;
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diff changeset
291 uint32_t *out = NULL;
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diff changeset
292 uint32_t *palette = NULL;
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diff changeset
293 while(cur + MIN_CHUNK_SIZE <= buf_size)
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diff changeset
294 {
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diff changeset
295 uint32_t chunk_size = buffer[cur++] << 24;
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diff changeset
296 chunk_size |= buffer[cur++] << 16;
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diff changeset
297 chunk_size |= buffer[cur++] << 8;
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diff changeset
298 chunk_size |= buffer[cur++];
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diff changeset
299 if (!memcmp(ihdr, buffer + cur, sizeof(ihdr))) {
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diff changeset
300 if (chunk_size < MIN_IHDR_SIZE || cur + MIN_IHDR_SIZE > buf_size) {
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diff changeset
301 return NULL;
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Michael Pavone <pavone@retrodev.com>
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diff changeset
302 }
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diff changeset
303 cur += sizeof(ihdr);
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diff changeset
304 *width = buffer[cur++] << 24;
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diff changeset
305 *width |= buffer[cur++] << 16;
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diff changeset
306 *width |= buffer[cur++] << 8;
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diff changeset
307 *width |= buffer[cur++];
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diff changeset
308 *height = buffer[cur++] << 24;
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diff changeset
309 *height |= buffer[cur++] << 16;
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diff changeset
310 *height |= buffer[cur++] << 8;
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diff changeset
311 *height |= buffer[cur++];
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diff changeset
312 if (*width > MAX_SUPPORTED_DIM || *height > MAX_SUPPORTED_DIM) {
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diff changeset
313 return NULL;
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Michael Pavone <pavone@retrodev.com>
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diff changeset
314 }
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Michael Pavone <pavone@retrodev.com>
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diff changeset
315 bits = buffer[cur++];
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diff changeset
316 if (bits != 8) {
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diff changeset
317 //only support 8-bits per element for now
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diff changeset
318 return NULL;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
319 }
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
320 color_type = buffer[cur++];
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
321 if (color_type > COLOR_TRUE_ALPHA || color_type == 1 || color_type == 5) {
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diff changeset
322 //reject invalid color type
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
323 return NULL;
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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++];
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parents: 1532
diff changeset
326 if (comp_type) {
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
327 //only compression type 0 is defined by the spec
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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++];
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
331 interlace = buffer[cur++];
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diff changeset
332 if (interlace) {
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parents: 1532
diff changeset
333 //interlacing not supported for now
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
334 return NULL;
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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;
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parents: 1532
diff changeset
337 has_header = 1;
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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) {
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
340 //IHDR is required to be the first chunk, fail if it isn't
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
341 break;
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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
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parents: 1532
diff changeset
344 //TODO: implement paletted images
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
345 } else if (!memcmp(idat, buffer + cur, sizeof(idat))) {
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parents: 1532
diff changeset
346 cur += sizeof(idat);
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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
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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
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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
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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
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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;
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parents: 1532
diff changeset
372 uint8_t bpp;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
373 pixel_fun pixel;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
374 switch (color_type)
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
375 {
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
376 case COLOR_GRAY:
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
377 uncompressed_size *= bits / 8;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
378 bpp = bits/8;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
379 pixel = pixel_gray;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
380 break;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
381 case COLOR_TRUE:
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parents: 1532
diff changeset
382 uncompressed_size *= 3 * bits / 8;
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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: {
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
387 uint32_t pixels_per_byte = 8 / bits;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
388 uncompressed_size = (*width / pixels_per_byte) * *height;
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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:
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
396 uncompressed_size *= bits / 4;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
397 bpp = bits / 4;
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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;
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Michael Pavone <pavone@retrodev.com>
parents: 1532
diff changeset
400 case COLOR_TRUE_ALPHA:
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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;
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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 }