/*
* PNG image format
- * Copyright (c) 2003 Fabrice Bellard.
+ * Copyright (c) 2003 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
-#include "bytestream.h"
#include "png.h"
-const uint8_t ff_pngsig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
-const uint8_t ff_mngsig[8] = {138, 77, 78, 71, 13, 10, 26, 10};
-
/* Mask to determine which y pixels are valid in a pass */
const uint8_t ff_png_pass_ymask[NB_PASSES] = {
0x80, 0x80, 0x08, 0x88, 0x22, 0xaa, 0x55,
};
/* minimum x value */
-const uint8_t ff_png_pass_xmin[NB_PASSES] = {
+static const uint8_t ff_png_pass_xmin[NB_PASSES] = {
0, 4, 0, 2, 0, 1, 0
};
/* x shift to get row width */
-const uint8_t ff_png_pass_xshift[NB_PASSES] = {
+static const uint8_t ff_png_pass_xshift[NB_PASSES] = {
3, 3, 2, 2, 1, 1, 0
};
-/* Mask to determine which pixels are valid in a pass */
-const uint8_t ff_png_pass_mask[NB_PASSES] = {
- 0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff
-};
-
void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size)
{
- if(items >= UINT_MAX / size)
- return NULL;
- return av_malloc(items * size);
+ return av_mallocz_array(items, size);
}
void ff_png_zfree(void *opaque, void *ptr)
xmin = ff_png_pass_xmin[pass];
if (width <= xmin)
return 0;
- shift = ff_png_pass_xshift[pass];
+ shift = ff_png_pass_xshift[pass];
pass_width = (width - xmin + (1 << shift) - 1) >> shift;
return (pass_width * bits_per_pixel + 7) >> 3;
}