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 return Sys_LoadLibrary (dllnames, &png_dll, pngfuncs);
135 void PNG_CloseLibrary (void)
137 Sys_UnloadLibrary (&png_dll);
142 =================================================================
146 =================================================================
149 #define PNG_LIBPNG_VER_STRING "1.2.4"
151 #define PNG_COLOR_MASK_PALETTE 1
152 #define PNG_COLOR_MASK_COLOR 2
153 #define PNG_COLOR_MASK_ALPHA 4
155 #define PNG_COLOR_TYPE_GRAY 0
156 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
157 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
158 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
159 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
161 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
162 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
164 #define PNG_INFO_tRNS 0x0010
166 // this struct is only used for status information during loading
169 const unsigned char *tmpBuf;
174 unsigned int FRowBytes;
176 //double FScreenGamma;
177 unsigned char **FRowPtrs;
185 unsigned long Height; // retarded libpng 1.2 pngconf.h uses long (64bit/32bit depending on arch)
186 unsigned long Width; // retarded libpng 1.2 pngconf.h uses long (64bit/32bit depending on arch)
190 //double LastModified;
194 //LordHavoc: removed __cdecl prefix, added overrun protection, and rewrote this to be more efficient
195 void PNG_fReadData(void *png, unsigned char *data, size_t length)
198 l = my_png.tmpBuflength - my_png.tmpi;
201 Con_Printf("PNG_fReadData: overrun by %i bytes\n", (int)(length - l));
202 // a read going past the end of the file, fill in the remaining bytes
203 // with 0 just to be consistent
204 memset(data + l, 0, length - l);
207 memcpy(data, my_png.tmpBuf + my_png.tmpi, length);
208 my_png.tmpi += (int)length;
209 //Com_HexDumpToConsole(data, (int)length);
212 void PNG_error_fn(void *png, const char *message)
214 Con_Printf("PNG_LoadImage: error: %s\n", message);
217 void PNG_warning_fn(void *png, const char *message)
219 Con_Printf("PNG_LoadImage: warning: %s\n", message);
222 extern int image_width;
223 extern int image_height;
225 unsigned char *PNG_LoadImage_BGRA (const unsigned char *raw, int filesize)
230 unsigned char *imagedata = NULL;
231 unsigned char ioBuffer[8192];
233 // FIXME: register an error handler so that abort() won't be called on error
239 if(qpng_sig_cmp(raw, 0, filesize))
241 png = (void *)qpng_create_read_struct(PNG_LIBPNG_VER_STRING, 0, (void *)PNG_error_fn, (void *)PNG_warning_fn);
245 // this must be memset before the setjmp error handler, because it relies
246 // on the fields in this struct for cleanup
247 memset(&my_png, 0, sizeof(my_png));
249 // NOTE: this relies on jmp_buf being the first thing in the png structure
250 // created by libpng! (this is correct for libpng 1.2.x)
253 if (setjmp((int *)png))
255 if (setjmp((__jmp_buf_tag *)png))
262 Mem_Free(my_png.Data);
265 Mem_Free(my_png.FRowPtrs);
266 my_png.FRowPtrs = NULL;
267 qpng_destroy_read_struct(&png, &pnginfo, 0);
272 pnginfo = qpng_create_info_struct(png);
275 qpng_destroy_read_struct(&png, &pnginfo, 0);
278 qpng_set_sig_bytes(png, 0);
281 my_png.tmpBuflength = filesize;
283 //my_png.Data = NULL;
284 //my_png.FRowPtrs = NULL;
287 my_png.ColorType = PNG_COLOR_TYPE_RGB;
288 //my_png.Interlace = 0;
289 //my_png.Compression = 0;
291 qpng_set_read_fn(png, ioBuffer, (void *)PNG_fReadData);
292 qpng_read_info(png, pnginfo);
293 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);
295 // 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
296 // (if it's little endian the unwritten bytes are the most significant
297 // ones and we don't worry about that)
299 // this is only necessary because of retarded 64bit png_uint_32 types in libpng 1.2, which can (conceivably) vary by platform
300 #if LONG_MAX > 4000000000
301 if (my_png.Width > LONG_MAX || my_png.Height > LONG_MAX)
304 my_png.Height >>= 32;
308 if (my_png.ColorType == PNG_COLOR_TYPE_PALETTE)
309 qpng_set_palette_to_rgb(png);
310 if (my_png.ColorType == PNG_COLOR_TYPE_GRAY || my_png.ColorType == PNG_COLOR_TYPE_GRAY_ALPHA)
312 qpng_set_gray_to_rgb(png);
313 if (my_png.BitDepth < 8)
314 qpng_set_gray_1_2_4_to_8(png);
317 if (qpng_get_valid(png, pnginfo, PNG_INFO_tRNS))
318 qpng_set_tRNS_to_alpha(png);
319 if (my_png.BitDepth == 8 && !(my_png.ColorType & PNG_COLOR_MASK_ALPHA))
320 qpng_set_filler(png, 255, 1);
321 if (( my_png.ColorType == PNG_COLOR_TYPE_GRAY) || (my_png.ColorType == PNG_COLOR_TYPE_GRAY_ALPHA ))
322 qpng_set_gray_to_rgb(png);
323 if (my_png.BitDepth < 8)
324 qpng_set_expand(png);
326 qpng_read_update_info(png, pnginfo);
328 my_png.FRowBytes = qpng_get_rowbytes(png, pnginfo);
329 my_png.BytesPerPixel = qpng_get_channels(png, pnginfo);
331 my_png.FRowPtrs = (unsigned char **)Mem_Alloc(tempmempool, my_png.Height * sizeof(*my_png.FRowPtrs));
334 imagedata = (unsigned char *)Mem_Alloc(tempmempool, my_png.Height * my_png.FRowBytes);
337 my_png.Data = imagedata;
338 for(y = 0;y < my_png.Height;y++)
339 my_png.FRowPtrs[y] = my_png.Data + y * my_png.FRowBytes;
340 qpng_read_image(png, my_png.FRowPtrs);
343 Con_DPrintf("PNG_LoadImage : not enough memory\n");
344 Mem_Free(my_png.FRowPtrs);
345 my_png.FRowPtrs = NULL;
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;
356 if (my_png.BitDepth != 8)
358 Con_Printf ("PNG_LoadImage : bad color depth\n");
363 // swizzle RGBA to BGRA
364 for (y = 0;y < (unsigned int)(image_width*image_height*4);y += 4)
367 imagedata[y+0] = imagedata[y+2];