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#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "gd.h"
#ifdef HAVE_LIBVPX
#include "webpimg.h"
#include "gdhelpers.h"
extern void gd_YUV420toRGBA(uint8* Y,
uint8* U,
uint8* V,
gdImagePtr im);
extern void gd_RGBAToYUV420(gdImagePtr im2,
uint8* Y,
uint8* U,
uint8* V);
const char * gdWebpGetVersionString()
{
return "not defined";
}
gdImagePtr gdImageCreateFromWebp (FILE * inFile)
{
gdImagePtr im;
gdIOCtx *in = gdNewFileCtx(inFile);
im = gdImageCreateFromWebpCtx(in);
in->gd_free(in);
return im;
}
gdImagePtr gdImageCreateFromWebpPtr (int size, void *data)
{
int width, height, ret;
unsigned char *Y = NULL;
unsigned char *U = NULL;
unsigned char *V = NULL;
gdImagePtr im;
ret = WebPDecode(data, size, &Y, &U, &V, &width, &height);
if (ret != webp_success) {
if (Y) free(Y);
if (U) free(U);
if (V) free(V);
php_gd_error("WebP decode: fail to decode input data");
return NULL;
}
im = gdImageCreateTrueColor(width, height);
if (!im) {
return NULL;
}
gd_YUV420toRGBA(Y, U, V, im);
return im;
}
#define GD_WEBP_ALLOC_STEP (4*1024)
gdImagePtr gdImageCreateFromWebpCtx (gdIOCtx * infile)
{
int width, height, ret;
unsigned char *filedata = NULL;
unsigned char *read, *temp;
unsigned char *Y = NULL;
unsigned char *U = NULL;
unsigned char *V = NULL;
size_t size = 0, n;
gdImagePtr im;
do {
temp = gdRealloc(filedata, size+GD_WEBP_ALLOC_STEP);
if (temp) {
filedata = temp;
read = temp + size;
} else {
if (filedata) {
gdFree(filedata);
}
php_gd_error("WebP decode: realloc failed");
return NULL;
}
n = gdGetBuf(read, GD_WEBP_ALLOC_STEP, infile);
/* differs from upstream where gdGetBuf return 0 instead of EOF */
if (n>0 && n!=EOF) {
size += n;
}
} while (n>0 && n!=EOF);
ret = WebPDecode(filedata, size, &Y, &U, &V, &width, &height);
gdFree(filedata);
if (ret != webp_success) {
if (Y) free(Y);
if (U) free(U);
if (V) free(V);
php_gd_error("WebP decode: fail to decode input data");
return NULL;
}
im = gdImageCreateTrueColor(width, height);
gd_YUV420toRGBA(Y, U, V, im);
return im;
}
void gdImageWebpEx (gdImagePtr im, FILE * outFile, int quantization)
{
gdIOCtx *out = gdNewFileCtx(outFile);
gdImageWebpCtx(im, out, quantization);
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 quantization)
{
void *rv;
gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
gdImageWebpCtx(im, out, quantization);
rv = gdDPExtractData(out, size);
out->gd_free(out);
return rv;
}
/*
* Maps normalized QP (quality) to VP8 QP
*/
int mapQualityToVP8QP(int quality) {
#define MIN_QUALITY 0
#define MAX_QUALITY 100
#define MIN_VP8QP 1
#define MAX_VP8QP 63
const float scale = MAX_VP8QP - MIN_VP8QP;
const float vp8qp =
scale * (MAX_QUALITY - quality) / (MAX_QUALITY - MIN_QUALITY) + MIN_VP8QP;
if (quality < MIN_QUALITY || quality > MAX_QUALITY) {
php_gd_error("Wrong quality value %d.", quality);
return -1;
}
return (int)(vp8qp + 0.5);
}
/* This routine is based in part on code from Dale Lutz (Safe Software Inc.)
* and in part on demo code from Chapter 15 of "PNG: The Definitive Guide"
* (http://www.cdrom.com/pub/png/pngbook.html).
*/
void gdImageWebpCtx (gdImagePtr im, gdIOCtx * outfile, int quantization)
{
int width = im->sx;
int height = im->sy;
int colors = im->colorsTotal;
int *open = im->open;
int yuv_width, yuv_height, yuv_nbytes, ret;
int vp8_quality;
unsigned char *Y = NULL,
*U = NULL,
*V = NULL;
unsigned char *filedata = NULL;
/* Conversion to Y,U,V buffer */
yuv_width = (width + 1) >> 1;
yuv_height = (height + 1) >> 1;
if (overflow2(width, height)) {
return;
}
/* simplification possible, because WebP must not be larger than 16384**2 */
if (overflow2(width * height, 2 * sizeof(unsigned char))) {
return;
}
yuv_nbytes = width * height + 2 * yuv_width * yuv_height;
if ((Y = (unsigned char *)gdCalloc(yuv_nbytes, sizeof(unsigned char))) == NULL) {
php_gd_error("gd-webp error: cannot allocate Y buffer");
return;
}
vp8_quality = mapQualityToVP8QP(quantization);
U = Y + width * height;
V = U + yuv_width * yuv_height;
gd_RGBAToYUV420(im, Y, U, V);
/* Encode Y,U,V and write data to file */
ret = WebPEncode(Y, U, V, width, height, width, yuv_width, yuv_height, yuv_width,
vp8_quality, &filedata, &yuv_nbytes, NULL);
gdFree(Y);
if (ret != webp_success) {
if (filedata) {
free(filedata);
}
php_gd_error("gd-webp error: WebP Encoder failed");
return;
}
gdPutBuf (filedata, yuv_nbytes, outfile);
free(filedata);
}
#endif /* HAVE_LIBVPX */
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