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add a decoding option to flip image vertically

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New API options: WebPDecoderOptions.flip and 'dwebp -flip ...'

it uses negative stride trick.

Also changed the decoder code to support user-supplied
buffers with negative stride, independently of the
WebPDecoderOptions.flip value.

Change-Id: I4dc0d06f0c87e51a3f3428be4fee2d6b5ad76053
This commit is contained in:
skal
2014-01-16 15:48:43 +01:00
parent 00c3c4e114
commit 5da185522b
8 changed files with 99 additions and 37 deletions
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5
src/webp/decode.h
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@ -20,7 +20,7 @@
extern "C" {
#endif
#define WEBP_DECODER_ABI_VERSION 0x0203 // MAJOR(8b) + MINOR(8b)
#define WEBP_DECODER_ABI_VERSION 0x0204 // MAJOR(8b) + MINOR(8b)
// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
@ -442,11 +442,12 @@ struct WebPDecoderOptions {
int scaled_width, scaled_height; // final resolution
int use_threads; // if true, use multi-threaded decoding
int dithering_strength; // dithering strength (0=Off, 100=full)
int flip; // flip output vertically
// Unused for now:
int force_rotation; // forced rotation (to be applied _last_)
int no_enhancement; // if true, discard enhancement layer
uint32_t pad[5]; // padding for later use
uint32_t pad[4]; // padding for later use
};
// Main object storing the configuration for advanced decoding.