1 #include <l4/libpng/l4png_wrap.h>
2 #include <l4/sys/l4int.h>
8 # define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
17 #define u16 unsigned short
19 #define PNG_BYTES_TO_CHECK 4
20 #define PNG_ROW_MEM_SIZE 8
23 static int check_if_png(char *png_data)
26 char buf[PNG_BYTES_TO_CHECK];
28 for (i=0; i<PNG_BYTES_TO_CHECK; i++)
31 /* Compare the first PNG_BYTES_TO_CHECK bytes of the signature.
32 Return nonzero (true) if they match */
34 return png_sig_cmp((unsigned char *)buf, (png_size_t)0, PNG_BYTES_TO_CHECK);
38 struct l4png_wrap_read_func_struct {
45 l4png_wrap_read_func_from_memory(png_structp png_ptr, png_bytep data,
49 l4png_wrap_read_func_from_memory(png_structp png_ptr, png_bytep data,
52 struct l4png_wrap_read_func_struct *a
53 = (struct l4png_wrap_read_func_struct *)png_ptr->io_ptr;
57 if (a->offset + length > a->size)
58 png_error(png_ptr, "read too much");
60 memcpy(data, a->mem + a->offset, length);
64 enum mode_t { M_MEMORY, M_FILE };
66 static int __internal_png_get_size(enum mode_t mode,
67 void *png_data, int png_data_size,
69 int *width, int *height)
73 struct l4png_wrap_read_func_struct memio;
75 /* check if png_data really contains a png image */
78 if (check_if_png(png_data))
82 /* create png read struct */
83 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
91 memio.size = png_data_size;
93 png_set_read_fn(png_ptr, &memio, l4png_wrap_read_func_from_memory);
96 /* create png info struct */
97 info_ptr = png_create_info_struct(png_ptr);
101 png_destroy_read_struct(&png_ptr, NULL, NULL);
105 if (setjmp(png_jmpbuf(png_ptr)))
107 /* Free all of the memory associated with the png_ptr and info_ptr */
108 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
110 /* If we get here, we had a problem reading the file */
114 if (mode == M_MEMORY)
115 png_init_io(png_ptr,(png_FILE_p) &memio);
117 png_init_io(png_ptr,(png_FILE_p) fp);
119 /* read info struct */
120 png_read_info(png_ptr, info_ptr);
122 *width = png_get_image_width(png_ptr,info_ptr);
123 *height = png_get_image_height(png_ptr,info_ptr);
125 /* free mem of png structs */
126 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
131 int png_get_size_mem(void *png_data, int png_data_size,
132 int *width, int *height)
134 return __internal_png_get_size(M_MEMORY, png_data, png_data_size, NULL,
138 int png_get_size_file(const char *filename, int *width, int *height)
143 if (!(fp = fopen(filename, "rb")))
146 r = __internal_png_get_size(M_FILE, NULL, 0, fp, width, height);
152 static int __internal_png_convert_ARGB
153 (enum mode_t mode, void *png_data, void *argb_buf,
154 int png_data_size, unsigned argb_max_size, FILE *fp)
158 png_uint_32 width, height;
159 char *row_ptr, *row_ptr_backup, *dst;
161 int bit_depth, color_type, interlace_type, a, r, g, b, offset;
162 struct l4png_wrap_read_func_struct memio;
164 if (mode == M_MEMORY)
165 /* check if png_data really contains a png image */
166 if(check_if_png((char *)png_data)) return ENOPNG;
170 /* create png read struct */
171 png_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL,
177 if (mode == M_MEMORY)
179 memio.mem = png_data;
180 memio.size = png_data_size;
182 png_set_read_fn(png_ptr, &memio, l4png_wrap_read_func_from_memory);
185 /* create png info struct */
186 info_ptr = png_create_info_struct(png_ptr);
188 if (info_ptr==NULL) {
189 png_destroy_read_struct(&png_ptr, NULL, NULL);
193 if (setjmp(png_jmpbuf(png_ptr)))
195 /* Free all of the memory associated with the png_ptr and info_ptr */
196 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
198 /* If we get here, we had a problem reading the file */
202 dst = (char *) argb_buf;
204 if (mode == M_MEMORY)
205 png_init_io(png_ptr,(png_FILE_p) &memio);
207 png_init_io(png_ptr,(png_FILE_p) fp);
209 /* read info struct */
210 png_read_info(png_ptr, info_ptr);
212 /* get image data chunk */
213 png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
214 &interlace_type, NULL, NULL);
216 if (argb_max_size < height*width*offset) {
217 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
218 return ARGB_BUF_TO_SMALL;
221 if (color_type == PNG_COLOR_TYPE_PALETTE) png_set_palette_to_rgb(png_ptr);
223 /* set down to 8bit value */
224 if (bit_depth == 16) png_set_strip_16(png_ptr);
226 /* normally png files have rgba format now swap it into argb */
227 if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) png_set_swap_alpha(png_ptr);
228 else png_set_filler(png_ptr, 0xff, PNG_FILLER_BEFORE);
230 row_ptr = malloc(png_get_rowbytes(png_ptr,info_ptr)*PNG_ROW_MEM_SIZE);
232 if (row_ptr == NULL) {
233 printf("not enough memory for a png row");
237 row_ptr_backup = row_ptr;
239 for (row = 0;row<height-1;row++) {
241 /* backup row pointer to start address */
242 row_ptr = row_ptr_backup;
244 /* read a single row */
245 png_read_row(png_ptr, (png_bytep)row_ptr, NULL);
247 /* calculate ARGB value and copy it to destination buffer */
248 for (j=0;j<width;j++) {
254 *(dst+j*offset+1) = r;
255 *(dst+j*offset+2) = g;
256 *(dst+j*offset+3) = b;
261 /* free mem of png structs */
262 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
268 int png_convert_ARGB_mem(void *png_data, void *argb_buf,
269 int png_data_size, unsigned argb_max_size)
271 return __internal_png_convert_ARGB(M_MEMORY, png_data, argb_buf,
272 png_data_size, argb_max_size, NULL);
275 int png_convert_ARGB_file(const char *filename, void *argb_buf,
276 unsigned argb_max_size)
281 if (!(fp = fopen(filename, "rb")))
284 r = __internal_png_convert_ARGB(M_FILE, 0, argb_buf,
285 0, argb_max_size, fp);
292 #define DITHER_SIZE 16
294 static const int dither_matrix[DITHER_SIZE][DITHER_SIZE] = {
295 { 0,192, 48,240, 12,204, 60,252, 3,195, 51,243, 15,207, 63,255 },
296 { 128, 64,176,112,140, 76,188,124,131, 67,179,115,143, 79,191,127 },
297 { 32,224, 16,208, 44,236, 28,220, 35,227, 19,211, 47,239, 31,223 },
298 { 160, 96,144, 80,172,108,156, 92,163, 99,147, 83,175,111,159, 95 },
299 { 8,200, 56,248, 4,196, 52,244, 11,203, 59,251, 7,199, 55,247 },
300 { 136, 72,184,120,132, 68,180,116,139, 75,187,123,135, 71,183,119 },
301 { 40,232, 24,216, 36,228, 20,212, 43,235, 27,219, 39,231, 23,215 },
302 { 168,104,152, 88,164,100,148, 84,171,107,155, 91,167,103,151, 87 },
303 { 2,194, 50,242, 14,206, 62,254, 1,193, 49,241, 13,205, 61,253 },
304 { 130, 66,178,114,142, 78,190,126,129, 65,177,113,141, 77,189,125 },
305 { 34,226, 18,210, 46,238, 30,222, 33,225, 17,209, 45,237, 29,221 },
306 { 162, 98,146, 82,174,110,158, 94,161, 97,145, 81,173,109,157, 93 },
307 { 10,202, 58,250, 6,198, 54,246, 9,201, 57,249, 5,197, 53,245 },
308 { 138, 74,186,122,134, 70,182,118,137, 73,185,121,133, 69,181,117 },
309 { 42,234, 26,218, 38,230, 22,214, 41,233, 25,217, 37,229, 21,213 },
310 { 170,106,154, 90,166,102,150, 86,169,105,153, 89,165,101,149, 85 }
314 static inline void convert_24to16(unsigned char *src, short *dst, int width, int line)
317 int const *dm = dither_matrix[line & 0xf];
319 /* calculate 16bit RGB value and copy it to destination buffer */
320 for (j=0;j<width;j++) {
322 r = (int)(*(src++)) + (v>>5);
323 g = (int)(*(src++)) + (v>>6);
324 b = (int)(*(src++)) + (v>>5);
328 *(dst+j) = ((r&0xf8)<<8) + ((g&0xfc)<<3) + ((b&0xf8)>>3);
333 static int __internal_png_convert_RGB16bit
334 (enum mode_t mode, void *png_data, void *argb_buf, int png_data_size,
335 unsigned argb_max_size, int line_offset, FILE *fp)
339 png_uint_32 width, height;
340 unsigned char *row_ptr, *row_ptr_backup;
342 int bit_depth, color_type, interlace_type;
344 struct l4png_wrap_read_func_struct memio;
346 /* check if png_data really contains a png image */
347 if (mode == M_MEMORY)
348 if(check_if_png((char *)png_data)) return ENOPNG;
350 /* create png read struct */
351 png_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL,
355 printf("error during creation of png read struct");
359 if (mode == M_MEMORY)
361 memio.mem = png_data;
362 memio.size = png_data_size;
364 png_set_read_fn(png_ptr, &memio, l4png_wrap_read_func_from_memory);
368 /* create png info struct */
369 info_ptr = png_create_info_struct(png_ptr);
371 if (info_ptr==NULL) {
372 png_destroy_read_struct(&png_ptr, NULL, NULL);
373 printf("error during creation of png info struct");
377 if (setjmp(png_jmpbuf(png_ptr)))
379 /* Free all of the memory associated with the png_ptr and info_ptr */
380 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
382 /* If we are here, we had a problem reading the image */
386 dst = (unsigned short *) argb_buf;
388 if (mode == M_MEMORY)
389 png_init_io(png_ptr,(png_FILE_p)&memio);
391 png_init_io(png_ptr,(png_FILE_p)fp);
393 /* read info struct */
394 png_read_info(png_ptr, info_ptr);
396 /* get image data chunk */
397 png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
398 &interlace_type, NULL, NULL);
401 printf("bit_depth: %d, color_type: %d, width: %d, height: %d",
402 bit_depth, color_type, width, height);
404 if (argb_max_size < height*width*sizeof(u16)) {
406 /* Free all of the memory associated with the png_ptr and info_ptr */
407 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
409 return ARGB_BUF_TO_SMALL;
412 if (color_type == PNG_COLOR_TYPE_PALETTE) png_set_palette_to_rgb(png_ptr);
414 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
415 png_set_expand_gray_1_2_4_to_8(png_ptr);
417 if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
418 png_set_gray_to_rgb(png_ptr);
420 if (bit_depth < 8) png_set_packing(png_ptr);
422 /* set down to 8bit value */
423 if (bit_depth == 16) png_set_strip_16(png_ptr);
425 if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) png_set_strip_alpha(png_ptr);
427 row_ptr = malloc(png_get_rowbytes(png_ptr,info_ptr)*PNG_ROW_MEM_SIZE);
429 if (row_ptr == NULL) {
430 printf("not enough memory for a png row");
434 row_ptr_backup = row_ptr;
436 if (interlace_type == PNG_INTERLACE_NONE) {
438 for (row = 0;row<height-1;row++) {
440 /* backup row pointer to start address */
441 row_ptr = row_ptr_backup;
443 /* read a single row */
444 png_read_row(png_ptr, (png_bytep)row_ptr, NULL);
446 convert_24to16(row_ptr, (short *)dst, width, row);
447 // /* calculate 16bit RGB value and copy it to destination buffer */
448 // for (j=0;j<width;j++) {
452 // *(dst+j) = ((r&0xf8)<<8) + ((g&0xfc)<<3) + ((b&0xf8)>>3);
458 /* free old row pointer */
459 free(row_ptr_backup);
463 /* free mem of png structs */
464 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
469 int png_convert_RGB16bit_mem(void *png_data, void *argb_buf, int png_data_size,
470 unsigned argb_max_size, int line_offset)
472 return __internal_png_convert_RGB16bit(M_MEMORY, png_data, argb_buf,
473 png_data_size, argb_max_size,
477 int png_convert_RGB16bit_file(const char *filename, void *argb_buf,
478 unsigned argb_max_size, int line_offset)
483 if (!(fp = fopen(filename, "rb")))
486 r = __internal_png_convert_RGB16bit(M_FILE, 0, argb_buf,
487 0, argb_max_size, line_offset, fp);