2 Copyright (C) 2006 Serge "(515)" Ziryukin, Forest "LordHavoc" Hale
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 See the GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to:
18 Free Software Foundation, Inc.
19 59 Temple Place - Suite 330
20 Boston, MA 02111-1307, USA
24 //[515]: png implemented into DP ONLY FOR TESTING 2d stuff with csqc
25 // so delete this bullshit :D
27 //LordHavoc: rewrote most of this.
31 #include "image_png.h"
33 static void (*qpng_set_sig_bytes) (void*, int);
34 static int (*qpng_sig_cmp) (const unsigned char*, size_t, size_t);
35 static void* (*qpng_create_read_struct) (const char*, void*, void*, void*);
36 static void* (*qpng_create_info_struct) (void*);
37 static void (*qpng_read_info) (void*, void*);
38 static void (*qpng_set_expand) (void*);
39 static void (*qpng_set_gray_1_2_4_to_8) (void*);
40 static void (*qpng_set_palette_to_rgb) (void*);
41 static void (*qpng_set_tRNS_to_alpha) (void*);
42 static void (*qpng_set_gray_to_rgb) (void*);
43 static void (*qpng_set_filler) (void*, unsigned int, int);
44 static void (*qpng_read_update_info) (void*, void*);
45 static void (*qpng_read_image) (void*, unsigned char**);
46 static void (*qpng_read_end) (void*, void*);
47 static void (*qpng_destroy_read_struct) (void**, void**, void**);
48 static void (*qpng_set_read_fn) (void*, void*, void*);
49 static unsigned int (*qpng_get_valid) (void*, void*, unsigned int);
50 static unsigned int (*qpng_get_rowbytes) (void*, void*);
51 static unsigned char (*qpng_get_channels) (void*, void*);
52 static unsigned char (*qpng_get_bit_depth) (void*, void*);
53 static unsigned int (*qpng_get_IHDR) (void*, void*, unsigned long*, unsigned long*, int *, int *, int *, int *, int *);
54 static char* (*qpng_get_libpng_ver) (void*);
56 static dllfunction_t pngfuncs[] =
58 {"png_set_sig_bytes", (void **) &qpng_set_sig_bytes},
59 {"png_sig_cmp", (void **) &qpng_sig_cmp},
60 {"png_create_read_struct", (void **) &qpng_create_read_struct},
61 {"png_create_info_struct", (void **) &qpng_create_info_struct},
62 {"png_read_info", (void **) &qpng_read_info},
63 {"png_set_expand", (void **) &qpng_set_expand},
64 {"png_set_gray_1_2_4_to_8", (void **) &qpng_set_gray_1_2_4_to_8},
65 {"png_set_palette_to_rgb", (void **) &qpng_set_palette_to_rgb},
66 {"png_set_tRNS_to_alpha", (void **) &qpng_set_tRNS_to_alpha},
67 {"png_set_gray_to_rgb", (void **) &qpng_set_gray_to_rgb},
68 {"png_set_filler", (void **) &qpng_set_filler},
69 {"png_read_update_info", (void **) &qpng_read_update_info},
70 {"png_read_image", (void **) &qpng_read_image},
71 {"png_read_end", (void **) &qpng_read_end},
72 {"png_destroy_read_struct", (void **) &qpng_destroy_read_struct},
73 {"png_set_read_fn", (void **) &qpng_set_read_fn},
74 {"png_get_valid", (void **) &qpng_get_valid},
75 {"png_get_rowbytes", (void **) &qpng_get_rowbytes},
76 {"png_get_channels", (void **) &qpng_get_channels},
77 {"png_get_bit_depth", (void **) &qpng_get_bit_depth},
78 {"png_get_IHDR", (void **) &qpng_get_IHDR},
79 {"png_get_libpng_ver", (void **) &qpng_get_libpng_ver},
84 dllhandle_t png_dll = NULL;
88 =================================================================
92 =================================================================
99 Try to load the PNG DLL
102 qboolean PNG_OpenLibrary (void)
104 const char* dllnames [] =
110 #elif defined(MACOSX)
114 "libpng.so", // FreeBSD
124 if (! Sys_LoadLibrary (dllnames, &png_dll, pngfuncs))
126 Con_Printf ("PNG support disabled\n");
130 Con_Printf ("PNG support enabled\n");
142 void PNG_CloseLibrary (void)
144 Sys_UnloadLibrary (&png_dll);
149 =================================================================
153 =================================================================
156 #define PNG_LIBPNG_VER_STRING "1.2.4"
158 #define PNG_COLOR_MASK_PALETTE 1
159 #define PNG_COLOR_MASK_COLOR 2
160 #define PNG_COLOR_MASK_ALPHA 4
162 #define PNG_COLOR_TYPE_GRAY 0
163 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
164 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
165 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
166 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
168 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
169 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
171 #define PNG_INFO_tRNS 0x0010
173 // this struct is only used for status information during loading
176 const unsigned char *tmpBuf;
181 unsigned int FRowBytes;
183 //double FScreenGamma;
184 unsigned char **FRowPtrs;
192 unsigned long Height; // retarded libpng 1.2 pngconf.h uses long (64bit/32bit depending on arch)
193 unsigned long Width; // retarded libpng 1.2 pngconf.h uses long (64bit/32bit depending on arch)
197 //double LastModified;
201 //LordHavoc: removed __cdecl prefix, added overrun protection, and rewrote this to be more efficient
202 void PNG_fReadData(void *png, unsigned char *data, size_t length)
205 l = my_png.tmpBuflength - my_png.tmpi;
208 Con_Printf("PNG_fReadData: overrun by %i bytes\n", (int)(length - l));
209 // a read going past the end of the file, fill in the remaining bytes
210 // with 0 just to be consistent
211 memset(data + l, 0, length - l);
214 memcpy(data, my_png.tmpBuf + my_png.tmpi, length);
215 my_png.tmpi += (int)length;
216 //Com_HexDumpToConsole(data, (int)length);
219 void PNG_error_fn(void *png, const char *message)
221 Con_Printf("PNG_LoadImage: error: %s\n", message);
224 void PNG_warning_fn(void *png, const char *message)
226 Con_Printf("PNG_LoadImage: warning: %s\n", message);
229 extern int image_width;
230 extern int image_height;
232 unsigned char *PNG_LoadImage (const unsigned char *raw, int filesize, int matchwidth, int matchheight)
236 unsigned char *imagedata;
237 unsigned char ioBuffer[8192];
239 // FIXME: register an error handler so that abort() won't be called on error
245 if(qpng_sig_cmp(raw, 0, filesize))
247 png = (void *)qpng_create_read_struct(PNG_LIBPNG_VER_STRING, 0, (void *)PNG_error_fn, (void *)PNG_warning_fn);
251 // NOTE: this relies on jmp_buf being the first thing in the png structure
252 // created by libpng! (this is correct for libpng 1.2.x)
255 if (setjmp((int *)png))
257 if (setjmp((__jmp_buf_tag *)png))
263 qpng_destroy_read_struct(&png, &pnginfo, 0);
268 pnginfo = qpng_create_info_struct(png);
271 qpng_destroy_read_struct(&png, &pnginfo, 0);
274 qpng_set_sig_bytes(png, 0);
276 memset(&my_png, 0, sizeof(my_png));
278 my_png.tmpBuflength = filesize;
280 //my_png.Data = NULL;
281 //my_png.FRowPtrs = NULL;
284 my_png.ColorType = PNG_COLOR_TYPE_RGB;
285 //my_png.Interlace = 0;
286 //my_png.Compression = 0;
288 qpng_set_read_fn(png, ioBuffer, (void *)PNG_fReadData);
289 qpng_read_info(png, pnginfo);
290 qpng_get_IHDR(png, pnginfo, &my_png.Width, &my_png.Height,&my_png.BitDepth, &my_png.ColorType, &my_png.Interlace, &my_png.Compression, &my_png.Filter);
292 // this check guards against pngconf.h with unsigned int *width/height parameters on big endian systems by detecting the strange values and shifting them down 32bits
293 // (if it's little endian the unwritten bytes are the most significant
294 // ones and we don't worry about that)
296 // this is only necessary because of retarded 64bit png_uint_32 types in libpng 1.2, which can (conceivably) vary by platform
297 #if LONG_MAX > 4000000000
298 if (my_png.Width > LONG_MAX || my_png.Height > LONG_MAX)
301 my_png.Height >>= 32;
305 if ((matchwidth && my_png.Width != (unsigned long)matchwidth) || (matchheight && my_png.Height != (unsigned long)matchheight))
307 qpng_destroy_read_struct(&png, &pnginfo, 0);
310 if (my_png.ColorType == PNG_COLOR_TYPE_PALETTE)
311 qpng_set_palette_to_rgb(png);
312 if (my_png.ColorType == PNG_COLOR_TYPE_GRAY || my_png.ColorType == PNG_COLOR_TYPE_GRAY_ALPHA)
314 qpng_set_gray_to_rgb(png);
315 if (my_png.BitDepth < 8)
316 qpng_set_gray_1_2_4_to_8(png);
319 if (qpng_get_valid(png, pnginfo, PNG_INFO_tRNS))
320 qpng_set_tRNS_to_alpha(png);
321 if (my_png.BitDepth == 8 && !(my_png.ColorType & PNG_COLOR_MASK_ALPHA))
322 qpng_set_filler(png, 255, 1);
323 if (( my_png.ColorType == PNG_COLOR_TYPE_GRAY) || (my_png.ColorType == PNG_COLOR_TYPE_GRAY_ALPHA ))
324 qpng_set_gray_to_rgb(png);
325 if (my_png.BitDepth < 8)
326 qpng_set_expand(png);
328 qpng_read_update_info(png, pnginfo);
330 my_png.FRowBytes = qpng_get_rowbytes(png, pnginfo);
331 my_png.BytesPerPixel = qpng_get_channels(png, pnginfo);
333 my_png.FRowPtrs = (unsigned char **)Mem_Alloc(tempmempool, my_png.Height * sizeof(*my_png.FRowPtrs));
336 my_png.Data = (unsigned char *)Mem_Alloc(tempmempool, my_png.Height * my_png.FRowBytes);
339 for(y = 0;y < my_png.Height;y++)
340 my_png.FRowPtrs[y] = my_png.Data + y * my_png.FRowBytes;
341 qpng_read_image(png, my_png.FRowPtrs);
344 Con_DPrintf("PNG_LoadImage : not enough memory\n");
345 Mem_Free(my_png.FRowPtrs);
348 Con_DPrintf("PNG_LoadImage : not enough memory\n");
350 qpng_read_end(png, pnginfo);
351 qpng_destroy_read_struct(&png, &pnginfo, 0);
353 image_width = (int)my_png.Width;
354 image_height = (int)my_png.Height;
355 imagedata = my_png.Data;
357 if (my_png.BitDepth != 8)
359 Con_Printf ("PNG_LoadImage : bad color depth\n");