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Add an API to import a color-mapped image.

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Change-Id: I71421a1a706a74d184a24dc9276b55005d7457b5
This commit is contained in:
Vincent Rabaud 2016-09-23 13:23:10 +02:00
parent 30d43706d3
commit 18a9a0ab57
2 changed files with 40 additions and 0 deletions
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31
extras/extras.c
View File

@ -11,7 +11,9 @@
//
#include "./extras.h"
#include "webp/format_constants.h"
#include <assert.h>
#include <string.h>
#define XTRA_MAJ_VERSION 0
@ -108,4 +110,33 @@ int WebPImportRGB4444(const uint8_t* rgb4444, WebPPicture* pic) {
return 1;
}
int WebPImportColorMappedARGB(const uint8_t* indexed, int indexed_stride,
const uint32_t palette[], int palette_size,
WebPPicture* pic) {
int x, y;
uint32_t* dst;
// 256 as the input buffer is uint8_t.
assert(MAX_PALETTE_SIZE <= 256);
if (pic == NULL || indexed == NULL || indexed_stride < pic->width ||
palette == NULL || palette_size > MAX_PALETTE_SIZE || palette_size <= 0) {
return 0;
}
pic->use_argb = 1;
if (!WebPPictureAlloc(pic)) return 0;
dst = pic->argb;
for (y = 0; y < pic->height; ++y) {
for (x = 0; x < pic->width; ++x) {
// Make sure we are within the palette.
if (indexed[x] >= palette_size) {
WebPPictureFree(pic);
return 0;
}
dst[x] = palette[indexed[x]];
}
indexed += indexed_stride;
dst += pic->argb_stride;
}
return 1;
}
//------------------------------------------------------------------------------

9
extras/extras.h
View File

@ -42,6 +42,15 @@ WEBP_EXTERN(int) WebPImportRGB565(const uint8_t* rgb565, WebPPicture* pic);
// width and height must be set prior to calling this function.
WEBP_EXTERN(int) WebPImportRGB4444(const uint8_t* rgb4444, WebPPicture* pic);
// Import a color mapped image. The number of colors is less or equal to
// MAX_PALETTE_SIZE. 'pic' must have been initialized. Its content, if any,
// will be discarded. Returns 'false' in case of error, or if indexed[] contains
// invalid indices.
WEBP_EXTERN(int)
WebPImportColorMappedARGB(const uint8_t* indexed, int indexed_stride,
const uint32_t palette[], int palette_size,
WebPPicture* pic);
//------------------------------------------------------------------------------
// Parse a bitstream, search for VP8 (lossy) header and report a