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take colorspace into account when cropping

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(cherry picked from commit 4e33653b52637c74ae30adde7990265d1d43994b)

Conflicts:

	src/dec/vp8l.c
This commit is contained in:
Pascal Massimino 2012-03-27 12:24:56 +00:00 committed by James Zern
parent 61c2d51fd7
commit 1db888ba40
3 changed files with 20 additions and 15 deletions
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14
src/dec/io.c
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@ -468,12 +468,14 @@ static int InitRGBRescaler(const VP8Io* const io, WebPDecParams* const p) {
static int CustomSetup(VP8Io* io) {
WebPDecParams* const p = (WebPDecParams*)io->opaque;
const int is_rgb = (p->output->colorspace < MODE_YUV);
const WEBP_CSP_MODE colorspace = p->output->colorspace;
const int is_rgb = (colorspace < MODE_YUV);
const int is_alpha = IsAlphaMode(colorspace);
p->memory = NULL;
p->emit = NULL;
p->emit_alpha = NULL;
if (!WebPIoInitFromOptions(p->options, io)) {
if (!WebPIoInitFromOptions(p->options, io, is_alpha ? MODE_YUV : MODE_YUVA)) {
return 0;
}
@ -502,11 +504,11 @@ static int CustomSetup(VP8Io* io) {
} else {
p->emit = EmitYUV;
}
if (IsAlphaMode(p->output->colorspace)) {
// We need transparency output
if (is_alpha) { // need transparency output
p->emit_alpha =
is_rgb ? (p->output->colorspace == MODE_RGBA_4444 ?
EmitAlphaRGBA4444 : EmitAlphaRGB) : EmitAlphaYUV;
is_rgb ? (colorspace == MODE_RGBA_4444 ? EmitAlphaRGBA4444
: EmitAlphaRGB)
: EmitAlphaYUV;
}
}

11
src/dec/webp.c
View File

@ -613,7 +613,7 @@ VP8StatusCode WebPDecode(const uint8_t* data, uint32_t data_size,
// Cropping and rescaling.
int WebPIoInitFromOptions(const WebPDecoderOptions* const options,
VP8Io* const io) {
VP8Io* const io, WEBP_CSP_MODE src_colorspace) {
const int W = io->width;
const int H = io->height;
int x = 0, y = 0, w = W, h = H;
@ -623,9 +623,12 @@ int WebPIoInitFromOptions(const WebPDecoderOptions* const options,
if (io->use_cropping) {
w = options->crop_width;
h = options->crop_height;
// TODO(skal): take colorspace into account. Don't assume YUV420.
x = options->crop_left & ~1;
y = options->crop_top & ~1;
x = options->crop_left;
y = options->crop_top;
if (src_colorspace >= MODE_YUV) { // only snap for YUV420 or YUV422
x &= ~1;
y &= ~1; // TODO(later): only for YUV420, not YUV422.
}
if (x < 0 || y < 0 || w <= 0 || h <= 0 || x + w > W || y + h > H) {
return 0; // out of frame boundary error
}

10
src/dec/webpi.h
View File

@ -121,6 +121,11 @@ VP8StatusCode WebPParseHeaders(const uint8_t** data, uint32_t* data_size,
// hooks will use the supplied 'params' as io->opaque handle.
void WebPInitCustomIo(WebPDecParams* const params, VP8Io* const io);
// Setup crop_xxx fields, mb_w and mb_h in io. 'src_colorspace' refers
// to the *compressed* format, not the output one.
int WebPIoInitFromOptions(const WebPDecoderOptions* const options,
VP8Io* const io, WEBP_CSP_MODE src_colorspace);
//------------------------------------------------------------------------------
// Internal functions regarding WebPDecBuffer memory (in buffer.c).
// Don't really need to be externally visible for now.
@ -144,12 +149,7 @@ void WebPCopyDecBuffer(const WebPDecBuffer* const src,
// Copy and transfer ownership from src to dst (beware of parameter order!)
void WebPGrabDecBuffer(WebPDecBuffer* const src, WebPDecBuffer* const dst);
//------------------------------------------------------------------------------
// Cropping and rescaling.
// Setup crop_xxx fields, mb_w and mb_h
int WebPIoInitFromOptions(const WebPDecoderOptions* const options,
VP8Io* const io);
//------------------------------------------------------------------------------