| 1 | /* |
| 2 | * (C) GraÅžvydas "notaz" Ignotas, 2008-2011 |
| 3 | * |
| 4 | * This work is licensed under the terms of any of these licenses |
| 5 | * (at your option): |
| 6 | * - GNU GPL, version 2 or later. |
| 7 | * - GNU LGPL, version 2.1 or later. |
| 8 | * See the COPYING file in the top-level directory. |
| 9 | */ |
| 10 | |
| 11 | #include <stdio.h> |
| 12 | #include <stdlib.h> |
| 13 | #include <string.h> |
| 14 | #include <png.h> |
| 15 | #include "readpng.h" |
| 16 | #include "lprintf.h" |
| 17 | |
| 18 | int readpng(void *dest, const char *fname, readpng_what what, int req_w, int req_h) |
| 19 | { |
| 20 | FILE *fp; |
| 21 | png_structp png_ptr = NULL; |
| 22 | png_infop info_ptr = NULL; |
| 23 | png_bytepp row_ptr = NULL; |
| 24 | int ret = -1; |
| 25 | |
| 26 | if (dest == NULL || fname == NULL) |
| 27 | { |
| 28 | return -1; |
| 29 | } |
| 30 | |
| 31 | fp = fopen(fname, "rb"); |
| 32 | if (fp == NULL) |
| 33 | { |
| 34 | lprintf(__FILE__ ": failed to open: %s\n", fname); |
| 35 | return -1; |
| 36 | } |
| 37 | |
| 38 | png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
| 39 | if (!png_ptr) |
| 40 | { |
| 41 | lprintf(__FILE__ ": png_create_read_struct() failed\n"); |
| 42 | fclose(fp); |
| 43 | return -1; |
| 44 | } |
| 45 | |
| 46 | info_ptr = png_create_info_struct(png_ptr); |
| 47 | if (!info_ptr) |
| 48 | { |
| 49 | lprintf(__FILE__ ": png_create_info_struct() failed\n"); |
| 50 | goto done; |
| 51 | } |
| 52 | |
| 53 | // Start reading |
| 54 | png_init_io(png_ptr, fp); |
| 55 | png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_PACKING, NULL); |
| 56 | row_ptr = png_get_rows(png_ptr, info_ptr); |
| 57 | if (row_ptr == NULL) |
| 58 | { |
| 59 | lprintf(__FILE__ ": png_get_rows() failed\n"); |
| 60 | goto done; |
| 61 | } |
| 62 | |
| 63 | // lprintf("%s: %ix%i @ %ibpp\n", fname, (int)png_get_image_width(png_ptr, info_ptr), (int)png_get_image_height(png_ptr, info_ptr), png_get_bit_depth(png_ptr, info_ptr)); |
| 64 | |
| 65 | switch (what) |
| 66 | { |
| 67 | case READPNG_BG: |
| 68 | { |
| 69 | int height, width, h; |
| 70 | unsigned short *dst = dest; |
| 71 | if (png_get_bit_depth(png_ptr, info_ptr) != 8) |
| 72 | { |
| 73 | lprintf(__FILE__ ": bg image uses %ibpc, needed 8bpc\n", png_get_bit_depth(png_ptr, info_ptr)); |
| 74 | break; |
| 75 | } |
| 76 | width = png_get_image_width(png_ptr, info_ptr); |
| 77 | if (width > req_w) |
| 78 | width = req_w; |
| 79 | height = png_get_image_height(png_ptr, info_ptr); |
| 80 | if (height > req_h) |
| 81 | height = req_h; |
| 82 | |
| 83 | for (h = 0; h < height; h++) |
| 84 | { |
| 85 | unsigned char *src = row_ptr[h]; |
| 86 | int len = width; |
| 87 | while (len--) |
| 88 | { |
| 89 | #ifdef PSP |
| 90 | *dst++ = ((src[2]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[0] >> 3); // BGR |
| 91 | #else |
| 92 | *dst++ = ((src[0]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[2] >> 3); // RGB |
| 93 | #endif |
| 94 | src += 3; |
| 95 | } |
| 96 | dst += req_w - width; |
| 97 | } |
| 98 | break; |
| 99 | } |
| 100 | |
| 101 | case READPNG_FONT: |
| 102 | { |
| 103 | int x, y, x1, y1; |
| 104 | unsigned char *dst = dest; |
| 105 | if (png_get_image_width(png_ptr, info_ptr) != req_w || png_get_image_height(png_ptr, info_ptr) != req_h) |
| 106 | { |
| 107 | lprintf(__FILE__ ": unexpected font image size %dx%d, needed %dx%d\n", |
| 108 | (int)png_get_image_width(png_ptr, info_ptr), (int)png_get_image_height(png_ptr, info_ptr), req_w, req_h); |
| 109 | break; |
| 110 | } |
| 111 | if (png_get_bit_depth(png_ptr, info_ptr) != 8) |
| 112 | { |
| 113 | lprintf(__FILE__ ": font image uses %ibpp, needed 8bpp\n", png_get_bit_depth(png_ptr, info_ptr)); |
| 114 | break; |
| 115 | } |
| 116 | for (y = 0; y < 16; y++) |
| 117 | { |
| 118 | for (x = 0; x < 16; x++) |
| 119 | { |
| 120 | /* 16x16 grid of syms */ |
| 121 | int sym_w = req_w / 16; |
| 122 | int sym_h = req_h / 16; |
| 123 | for (y1 = 0; y1 < sym_h; y1++) |
| 124 | { |
| 125 | unsigned char *src = row_ptr[y*sym_h + y1] + x*sym_w; |
| 126 | for (x1 = sym_w/2; x1 > 0; x1--, src+=2) |
| 127 | *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4); |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | break; |
| 132 | } |
| 133 | |
| 134 | case READPNG_SELECTOR: |
| 135 | { |
| 136 | int x1, y1; |
| 137 | unsigned char *dst = dest; |
| 138 | if (png_get_image_width(png_ptr, info_ptr) != req_w || png_get_image_height(png_ptr, info_ptr) != req_h) |
| 139 | { |
| 140 | lprintf(__FILE__ ": unexpected selector image size %ix%i, needed %dx%d\n", |
| 141 | (int)png_get_image_width(png_ptr, info_ptr), (int)png_get_image_height(png_ptr, info_ptr), req_w, req_h); |
| 142 | break; |
| 143 | } |
| 144 | if (png_get_bit_depth(png_ptr, info_ptr) != 8) |
| 145 | { |
| 146 | lprintf(__FILE__ ": selector image uses %ibpp, needed 8bpp\n", png_get_bit_depth(png_ptr, info_ptr)); |
| 147 | break; |
| 148 | } |
| 149 | for (y1 = 0; y1 < req_h; y1++) |
| 150 | { |
| 151 | unsigned char *src = row_ptr[y1]; |
| 152 | for (x1 = req_w/2; x1 > 0; x1--, src+=2) |
| 153 | *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4); |
| 154 | } |
| 155 | break; |
| 156 | } |
| 157 | |
| 158 | case READPNG_24: |
| 159 | { |
| 160 | int height, width, h; |
| 161 | unsigned char *dst = dest; |
| 162 | if (png_get_bit_depth(png_ptr, info_ptr) != 8) |
| 163 | { |
| 164 | lprintf(__FILE__ ": image uses %ibpc, needed 8bpc\n", png_get_bit_depth(png_ptr, info_ptr)); |
| 165 | break; |
| 166 | } |
| 167 | width = png_get_image_width(png_ptr, info_ptr); |
| 168 | if (width > req_w) |
| 169 | width = req_w; |
| 170 | height = png_get_image_height(png_ptr, info_ptr); |
| 171 | if (height > req_h) |
| 172 | height = req_h; |
| 173 | |
| 174 | for (h = 0; h < height; h++) |
| 175 | { |
| 176 | int len = width; |
| 177 | unsigned char *src = row_ptr[h]; |
| 178 | dst += (req_w - width) * 3; |
| 179 | for (len = width; len > 0; len--, dst+=3, src+=3) |
| 180 | dst[0] = src[2], dst[1] = src[1], dst[2] = src[0]; |
| 181 | } |
| 182 | break; |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | |
| 187 | ret = 0; |
| 188 | done: |
| 189 | png_destroy_read_struct(&png_ptr, info_ptr ? &info_ptr : NULL, (png_infopp)NULL); |
| 190 | fclose(fp); |
| 191 | return ret; |
| 192 | } |
| 193 | |
| 194 | int writepng(const char *fname, unsigned short *src, int w, int h) |
| 195 | { |
| 196 | png_structp png_ptr = NULL; |
| 197 | png_infop info_ptr = NULL; |
| 198 | png_bytepp row_pointers; |
| 199 | int i, j, ret = -1; |
| 200 | FILE *f; |
| 201 | |
| 202 | f = fopen(fname, "wb"); |
| 203 | if (f == NULL) { |
| 204 | lprintf(__FILE__ ": failed to open \"%s\"\n", fname); |
| 205 | return -1; |
| 206 | } |
| 207 | |
| 208 | row_pointers = calloc(h, sizeof(row_pointers[0])); |
| 209 | if (row_pointers == NULL) |
| 210 | goto end1; |
| 211 | |
| 212 | for (i = 0; i < h; i++) { |
| 213 | unsigned char *dst = malloc(w * 3); |
| 214 | if (dst == NULL) |
| 215 | goto end2; |
| 216 | row_pointers[i] = dst; |
| 217 | for (j = 0; j < w; j++, src++, dst += 3) { |
| 218 | dst[0] = (*src & 0xf800) >> 8; |
| 219 | dst[1] = (*src & 0x07e0) >> 3; |
| 220 | dst[2] = (*src & 0x001f) << 3; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | /* initialize stuff */ |
| 225 | png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
| 226 | if (png_ptr == NULL) { |
| 227 | fprintf(stderr, "png_create_write_struct() failed"); |
| 228 | goto end2; |
| 229 | } |
| 230 | |
| 231 | info_ptr = png_create_info_struct(png_ptr); |
| 232 | if (info_ptr == NULL) { |
| 233 | fprintf(stderr, "png_create_info_struct() failed"); |
| 234 | goto end3; |
| 235 | } |
| 236 | |
| 237 | if (setjmp(png_jmpbuf(png_ptr)) != 0) { |
| 238 | fprintf(stderr, "error in png code\n"); |
| 239 | goto end4; |
| 240 | } |
| 241 | |
| 242 | png_init_io(png_ptr, f); |
| 243 | |
| 244 | png_set_IHDR(png_ptr, info_ptr, w, h, |
| 245 | 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, |
| 246 | PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); |
| 247 | |
| 248 | png_write_info(png_ptr, info_ptr); |
| 249 | png_write_image(png_ptr, row_pointers); |
| 250 | png_write_end(png_ptr, NULL); |
| 251 | |
| 252 | ret = 0; |
| 253 | |
| 254 | end4: |
| 255 | // png_destroy_info_struct(png_ptr, &info_ptr); // freed below |
| 256 | end3: |
| 257 | png_destroy_write_struct(&png_ptr, &info_ptr); |
| 258 | end2: |
| 259 | for (i = 0; i < h; i++) |
| 260 | free(row_pointers[i]); |
| 261 | free(row_pointers); |
| 262 | end1: |
| 263 | fclose(f); |
| 264 | return ret; |
| 265 | } |
| 266 | |