readpng.c

   1 /*
   2  * (C) Gražvydas "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  *  - MAME license.
   9  * See the COPYING file in the top-level directory.
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <png.h>
  16 #include "readpng.h"
  17 #include "lprintf.h"
  18
  19 int readpng(void *dest, const char *fname, readpng_what what, int req_w, int req_h)
  20 {
  21         FILE *fp;
  22         png_structp png_ptr = NULL;
  23         png_infop info_ptr = NULL;
  24         png_bytepp row_ptr = NULL;
  25         int ret = -1;
  26
  27         if (dest == NULL || fname == NULL)
  28         {
  29                 return -1;
  30         }
  31
  32         fp = fopen(fname, "rb");
  33         if (fp == NULL)
  34         {
  35                 lprintf(__FILE__ ": failed to open: %s\n", fname);
  36                 return -1;
  37         }
  38
  39         png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
  40         if (!png_ptr)
  41         {
  42                 lprintf(__FILE__ ": png_create_read_struct() failed\n");
  43                 fclose(fp);
  44                 return -1;
  45         }
  46
  47         info_ptr = png_create_info_struct(png_ptr);
  48         if (!info_ptr)
  49         {
  50                 lprintf(__FILE__ ": png_create_info_struct() failed\n");
  51                 goto done;
  52         }
  53
  54         // Start reading
  55         png_init_io(png_ptr, fp);
  56         png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_PACKING, NULL);
  57         row_ptr = png_get_rows(png_ptr, info_ptr);
  58         if (row_ptr == NULL)
  59         {
  60                 lprintf(__FILE__ ": png_get_rows() failed\n");
  61                 goto done;
  62         }
  63
  64         // lprintf("%s: %ix%i @ %ibpp\n", fname, (int)info_ptr->width, (int)info_ptr->height, info_ptr->pixel_depth);
  65
  66         switch (what)
  67         {
  68                 case READPNG_BG:
  69                 {
  70                         int height, width, h;
  71                         unsigned short *dst = dest;
  72                         if (info_ptr->pixel_depth != 24)
  73                         {
  74                                 lprintf(__FILE__ ": bg image uses %ibpp, needed 24bpp\n", info_ptr->pixel_depth);
  75                                 break;
  76                         }
  77                         height = info_ptr->height;
  78                         if (height > req_h)
  79                                 height = req_h;
  80                         width = info_ptr->width;
  81                         if (width > req_w)
  82                                 width = req_w;
  83
  84                         for (h = 0; h < height; h++)
  85                         {
  86                                 unsigned char *src = row_ptr[h];
  87                                 int len = width;
  88                                 while (len--)
  89                                 {
  90 #ifdef PSP
  91                                         *dst++ = ((src[2]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[0] >> 3); // BGR
  92 #else
  93                                         *dst++ = ((src[0]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[2] >> 3); // RGB
  94 #endif
  95                                         src += 3;
  96                                 }
  97                                 dst += req_w - width;
  98                         }
  99                         break;
 100                 }
 101
 102                 case READPNG_FONT:
 103                 {
 104                         int x, y, x1, y1;
 105                         unsigned char *dst = dest;
 106                         if (info_ptr->width != req_w || info_ptr->height != req_h)
 107                         {
 108                                 lprintf(__FILE__ ": unexpected font image size %dx%d, needed %dx%d\n",
 109                                         (int)info_ptr->width, (int)info_ptr->height, req_w, req_h);
 110                                 break;
 111                         }
 112                         if (info_ptr->pixel_depth != 8)
 113                         {
 114                                 lprintf(__FILE__ ": font image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth);
 115                                 break;
 116                         }
 117                         for (y = 0; y < 16; y++)
 118                         {
 119                                 for (x = 0; x < 16; x++)
 120                                 {
 121                                         /* 16x16 grid of syms */
 122                                         int sym_w = req_w / 16;
 123                                         int sym_h = req_h / 16;
 124                                         for (y1 = 0; y1 < sym_h; y1++)
 125                                         {
 126                                                 unsigned char *src = row_ptr[y*sym_h + y1] + x*sym_w;
 127                                                 for (x1 = sym_w/2; x1 > 0; x1--, src+=2)
 128                                                         *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4);
 129                                         }
 130                                 }
 131                         }
 132                         break;
 133                 }
 134
 135                 case READPNG_SELECTOR:
 136                 {
 137                         int x1, y1;
 138                         unsigned char *dst = dest;
 139                         if (info_ptr->width != req_w || info_ptr->height != req_h)
 140                         {
 141                                 lprintf(__FILE__ ": unexpected selector image size %ix%i, needed %dx%d\n",
 142                                         (int)info_ptr->width, (int)info_ptr->height, req_w, req_h);
 143                                 break;
 144                         }
 145                         if (info_ptr->pixel_depth != 8)
 146                         {
 147                                 lprintf(__FILE__ ": selector image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth);
 148                                 break;
 149                         }
 150                         for (y1 = 0; y1 < req_h; y1++)
 151                         {
 152                                 unsigned char *src = row_ptr[y1];
 153                                 for (x1 = req_w/2; x1 > 0; x1--, src+=2)
 154                                         *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4);
 155                         }
 156                         break;
 157                 }
 158
 159                 case READPNG_24:
 160                 {
 161                         int height, width, h;
 162                         unsigned char *dst = dest;
 163                         if (info_ptr->pixel_depth != 24)
 164                         {
 165                                 lprintf(__FILE__ ": image uses %ibpp, needed 24bpp\n", info_ptr->pixel_depth);
 166                                 break;
 167                         }
 168                         height = info_ptr->height;
 169                         if (height > req_h)
 170                                 height = req_h;
 171                         width = info_ptr->width;
 172                         if (width > req_w)
 173                                 width = req_w;
 174
 175                         for (h = 0; h < height; h++)
 176                         {
 177                                 int len = width;
 178                                 unsigned char *src = row_ptr[h];
 179                                 dst += (req_w - width) * 3;
 180                                 for (len = width; len > 0; len--, dst+=3, src+=3)
 181                                         dst[0] = src[2], dst[1] = src[1], dst[2] = src[0];
 182                         }
 183                         break;
 184                 }
 185         }
 186
 187
 188         ret = 0;
 189 done:
 190         png_destroy_read_struct(&png_ptr, info_ptr ? &info_ptr : NULL, (png_infopp)NULL);
 191         fclose(fp);
 192         return ret;
 193 }
 194
 195 int writepng(const char *fname, unsigned short *src, int w, int h)
 196 {
 197         png_structp png_ptr = NULL;
 198         png_infop info_ptr = NULL;
 199         png_bytepp row_pointers;
 200         int i, j, ret = -1;
 201         FILE *f;
 202
 203         f = fopen(fname, "wb");
 204         if (f == NULL) {
 205                 lprintf(__FILE__ ": failed to open \"%s\"\n", fname);
 206                 return -1;
 207         }
 208
 209         row_pointers = calloc(h, sizeof(row_pointers[0]));
 210         if (row_pointers == NULL)
 211                 goto end1;
 212
 213         for (i = 0; i < h; i++) {
 214                 unsigned char *dst = malloc(w * 3);
 215                 if (dst == NULL)
 216                         goto end2;
 217                 row_pointers[i] = dst;
 218                 for (j = 0; j < w; j++, src++, dst += 3) {
 219                         dst[0] = (*src & 0xf800) >> 8;
 220                         dst[1] = (*src & 0x07e0) >> 3;
 221                         dst[2] = (*src & 0x001f) << 3;
 222                 }
 223         }
 224
 225         /* initialize stuff */
 226         png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 227         if (png_ptr == NULL) {
 228                 fprintf(stderr, "png_create_write_struct() failed");
 229                 goto end2;
 230         }
 231
 232         info_ptr = png_create_info_struct(png_ptr);
 233         if (info_ptr == NULL) {
 234                 fprintf(stderr, "png_create_info_struct() failed");
 235                 goto end3;
 236         }
 237
 238         if (setjmp(png_jmpbuf(png_ptr)) != 0) {
 239                 fprintf(stderr, "error in png code\n");
 240                 goto end4;
 241         }
 242
 243         png_init_io(png_ptr, f);
 244
 245         png_set_IHDR(png_ptr, info_ptr, w, h,
 246                 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
 247                 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
 248
 249         png_write_info(png_ptr, info_ptr);
 250         png_write_image(png_ptr, row_pointers);
 251         png_write_end(png_ptr, NULL);
 252
 253         ret = 0;
 254
 255 end4:
 256 //      png_destroy_info_struct(png_ptr, &info_ptr); // freed below
 257 end3:
 258         png_destroy_write_struct(&png_ptr, &info_ptr);
 259 end2:
 260         for (i = 0; i < h; i++)
 261                 free(row_pointers[i]);
 262         free(row_pointers);
 263 end1:
 264         fclose(f);
 265         return ret;
 266 }
 267