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Add Alpha Encode support from WebPEncode.

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Extend WebP Encode functionality to encode Alpha data and produce
bit-stream (RIFF+VP8X+ALPH+VP8) corresponding to WebP-Alpha.

Change-Id: I983b4cd97be94a86a8e6d03b3b9c728db851bf48
This commit is contained in:
Vikas Arora
2011-12-01 12:14:15 +05:30
parent 16612ddd30
commit 9523f2a5de
9 changed files with 207 additions and 138 deletions
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8
src/enc/picture.c
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@ -147,11 +147,11 @@ int WebPPictureCopy(const WebPPicture* const src, WebPPicture* const dst) {
dst->u, dst->uv_stride, HALVE(dst->width), HALVE(dst->height));
CopyPlane(src->v, src->uv_stride,
dst->v, dst->uv_stride, HALVE(dst->width), HALVE(dst->height));
#ifdef WEBP_EXPERIMENTAL_FEATURES
if (dst->a != NULL) {
CopyPlane(src->a, src->a_stride,
dst->a, dst->a_stride, dst->width, dst->height);
}
#ifdef WEBP_EXPERIMENTAL_FEATURES
if (dst->u0 != NULL) {
int uv0_width = src->width;
if ((dst->colorspace & WEBP_CSP_UV_MASK) == WEBP_YUV422) {
@ -194,12 +194,12 @@ int WebPPictureCrop(WebPPicture* const pic,
tmp.v, tmp.uv_stride, HALVE(width), HALVE(height));
}
#ifdef WEBP_EXPERIMENTAL_FEATURES
if (tmp.a) {
const int a_offset = top * pic->a_stride + left;
CopyPlane(pic->a + a_offset, pic->a_stride,
tmp.a, tmp.a_stride, width, height);
}
#ifdef WEBP_EXPERIMENTAL_FEATURES
if (tmp.u0) {
int w = width;
int l = left;
@ -347,11 +347,11 @@ int WebPPictureRescale(WebPPicture* const pic, int width, int height) {
tmp.v,
HALVE(width), HALVE(height), tmp.uv_stride, work);
#ifdef WEBP_EXPERIMENTAL_FEATURES
if (tmp.a) {
RescalePlane(pic->a, prev_width, prev_height, pic->a_stride,
tmp.a, width, height, tmp.a_stride, work);
}
#ifdef WEBP_EXPERIMENTAL_FEATURES
if (tmp.u0) {
int s = 1;
if ((tmp.colorspace & WEBP_CSP_UV_MASK) == WEBP_YUV422) {
@ -547,7 +547,6 @@ static int Import(WebPPicture* const picture,
}
if (import_alpha) {
#ifdef WEBP_EXPERIMENTAL_FEATURES
const uint8_t* const a_ptr = rgb + 3;
assert(step >= 4);
for (y = 0; y < height; ++y) {
@ -556,7 +555,6 @@ static int Import(WebPPicture* const picture,
a_ptr[step * x + y * rgb_stride];
}
}
#endif
}
return 1;
}