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ReadWebP: avoid conversion to ARGB if final format is YUVA

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Adds ExUtilCopyPlane() in example_utils.[ch], borrowed from
src/util/utils.h

(removes a TODO)

Change-Id: Iadfc19da3914c9439608f296e86225d279263566
This commit is contained in:
Pascal Massimino
2016-05-24 22:54:57 -07:00
parent 2ec2de1450
commit ab8d669887
4 changed files with 56 additions and 22 deletions
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23
examples/cwebp.c
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@ -50,13 +50,12 @@ static int verbose = 0;
static int ReadYUV(const uint8_t* const data, size_t data_size,
WebPPicture* const pic) {
int y;
const int use_argb = pic->use_argb;
const int uv_width = (pic->width + 1) / 2;
const int uv_height = (pic->height + 1) / 2;
const int y_plane_size = pic->width * pic->height;
const int uv_plane_size = uv_width * uv_height;
const size_t expected_data_size =
pic->width * pic->height + 2 * uv_plane_size;
const size_t expected_data_size = y_plane_size + 2 * uv_plane_size;
if (data_size != expected_data_size) {
fprintf(stderr,
@ -67,18 +66,12 @@ static int ReadYUV(const uint8_t* const data, size_t data_size,
pic->use_argb = 0;
if (!WebPPictureAlloc(pic)) return 0;
for (y = 0; y < pic->height; ++y) {
memcpy(pic->y + y * pic->y_stride, data + y * pic->width,
pic->width * sizeof(*pic->y));
}
for (y = 0; y < uv_height; ++y) {
const uint8_t* const uv_data = data + pic->height * pic->y_stride;
memcpy(pic->u + y * pic->uv_stride, uv_data + y * uv_width,
uv_width * sizeof(*uv_data));
memcpy(pic->v + y * pic->uv_stride, uv_data + y * uv_width + uv_plane_size,
uv_width * sizeof(*uv_data));
}
ExUtilCopyPlane(data, pic->width, pic->y, pic->y_stride,
pic->width, pic->height);
ExUtilCopyPlane(data + y_plane_size, uv_width,
pic->u, pic->uv_stride, uv_width, uv_height);
ExUtilCopyPlane(data + y_plane_size + uv_plane_size, uv_width,
pic->v, pic->uv_stride, uv_width, uv_height);
return use_argb ? WebPPictureYUVAToARGB(pic) : 1;
}