diff options
Diffstat (limited to 'ext/gd/libgd/gd_webp.c')
| -rw-r--r-- | ext/gd/libgd/gd_webp.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/ext/gd/libgd/gd_webp.c b/ext/gd/libgd/gd_webp.c new file mode 100644 index 000000000..889f5f10a --- /dev/null +++ b/ext/gd/libgd/gd_webp.c @@ -0,0 +1,201 @@ +#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; +} + +gdImagePtr gdImageCreateFromWebpCtx (gdIOCtx * infile) +{ + int width, height, ret; + unsigned char *filedata; + unsigned char dummy[1024]; + unsigned char *Y = NULL; + unsigned char *U = NULL; + unsigned char *V = NULL; + size_t size = 0, n; + gdImagePtr im; + + do { + n = gdGetBuf(dummy, 1024, infile); + size += n; + } while (n != EOF); + + filedata = gdMalloc(size); + if (!filedata) { + php_gd_error("WebP decode: alloc failed"); + return NULL; + } + gdGetBuf(filedata, size, infile); + 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; + 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 */ |