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#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "gd.h"
#include "gd_errors.h"
#include "gdhelpers.h"
#ifdef HAVE_LIBWEBP
#include "webp/decode.h"
#include "webp/encode.h"
#define GD_WEBP_ALLOC_STEP (4*1024)
gdImagePtr gdImageCreateFromWebp (FILE * inFile)
{
gdImagePtr im;
gdIOCtx *in = gdNewFileCtx(inFile);
if (!in)
return 0;
im = gdImageCreateFromWebpCtx(in);
in->gd_free(in);
return im;
}
gdImagePtr gdImageCreateFromWebpPtr (int size, void *data)
{
gdImagePtr im;
gdIOCtx *in = gdNewDynamicCtxEx(size, data, 0);
if (!in)
return 0;
im = gdImageCreateFromWebpCtx(in);
in->gd_free(in);
return im;
}
gdImagePtr gdImageCreateFromWebpCtx (gdIOCtx * infile)
{
int width, height;
uint8_t *filedata = NULL;
uint8_t *argb = NULL;
size_t size = 0, n;
gdImagePtr im;
int x, y;
uint8_t *p;
do {
unsigned char *read, *temp;
temp = gdRealloc(filedata, size+GD_WEBP_ALLOC_STEP);
if (temp) {
filedata = temp;
read = temp + size;
} else {
if (filedata) {
gdFree(filedata);
}
gd_error("WebP decode: realloc failed");
return NULL;
}
n = gdGetBuf(read, GD_WEBP_ALLOC_STEP, infile);
if (n>0 && n!=EOF) {
size += n;
}
} while (n>0 && n!=EOF);
if (WebPGetInfo(filedata,size, &width, &height) == 0) {
gd_error("gd-webp cannot get webp info");
gdFree(filedata);
return NULL;
}
im = gdImageCreateTrueColor(width, height);
if (!im) {
gdFree(filedata);
return NULL;
}
argb = WebPDecodeARGB(filedata, size, &width, &height);
if (!argb) {
gd_error("gd-webp cannot allocate temporary buffer");
gdFree(filedata);
gdImageDestroy(im);
return NULL;
}
for (y = 0, p = argb; y < height; y++) {
for (x = 0; x < width; x++) {
register uint8_t a = gdAlphaMax - (*(p++) >> 1);
register uint8_t r = *(p++);
register uint8_t g = *(p++);
register uint8_t b = *(p++);
im->tpixels[y][x] = gdTrueColorAlpha(r, g, b, a);
}
}
gdFree(filedata);
/* do not use gdFree here, in case gdFree/alloc is mapped to something else than libc */
free(argb);
im->saveAlphaFlag = 1;
return im;
}
void gdImageWebpCtx (gdImagePtr im, gdIOCtx * outfile, int quality)
{
uint8_t *argb;
int x, y;
uint8_t *p;
uint8_t *out;
size_t out_size;
if (im == NULL) {
return;
}
if (!gdImageTrueColor(im)) {
gd_error("Palette image not supported by webp");
return;
}
if (quality == -1) {
quality = 80;
}
if (overflow2(gdImageSX(im), 4)) {
return;
}
if (overflow2(gdImageSX(im) * 4, gdImageSY(im))) {
return;
}
argb = (uint8_t *)gdMalloc(gdImageSX(im) * 4 * gdImageSY(im));
if (!argb) {
return;
}
p = argb;
for (y = 0; y < gdImageSY(im); y++) {
for (x = 0; x < gdImageSX(im); x++) {
register int c;
register char a;
c = im->tpixels[y][x];
a = gdTrueColorGetAlpha(c);
if (a == 127) {
a = 0;
} else {
a = 255 - ((a << 1) + (a >> 6));
}
*(p++) = gdTrueColorGetRed(c);
*(p++) = gdTrueColorGetGreen(c);
*(p++) = gdTrueColorGetBlue(c);
*(p++) = a;
}
}
if (quality >= gdWebpLossless) {
out_size = WebPEncodeLosslessRGBA(argb, gdImageSX(im), gdImageSY(im), gdImageSX(im) * 4, &out);
} else {
out_size = WebPEncodeRGBA(argb, gdImageSX(im), gdImageSY(im), gdImageSX(im) * 4, quality, &out);
}
if (out_size == 0) {
gd_error("gd-webp encoding failed");
goto freeargb;
}
gdPutBuf(out, out_size, outfile);
free(out);
freeargb:
gdFree(argb);
}
void gdImageWebpEx (gdImagePtr im, FILE * outFile, int quality)
{
gdIOCtx *out = gdNewFileCtx(outFile);
gdImageWebpCtx(im, out, quality);
out->gd_free(out);
}
void gdImageWebp (gdImagePtr im, FILE * outFile)
{
gdIOCtx *out = gdNewFileCtx(outFile);
gdImageWebpCtx(im, out, -1);
out->gd_free(out);
}
void * gdImageWebpPtr (gdImagePtr im, int *size)
{
void *rv;
gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
gdImageWebpCtx(im, out, -1);
rv = gdDPExtractData(out, size);
out->gd_free(out);
return rv;
}
void * gdImageWebpPtrEx (gdImagePtr im, int *size, int quality)
{
void *rv;
gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
gdImageWebpCtx(im, out, quality);
rv = gdDPExtractData(out, size);
out->gd_free(out);
return rv;
}
#endif /* HAVE_LIBWEBP */
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