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Page Speed Optimization Libraries
1.13.35.1
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Page Speed Optimization Libraries
1.13.35.1
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#include "webp_optimizer.h"
Public Member Functions | |
| WebpScanlineReader (MessageHandler *handler) | |
| virtual bool | Reset () |
| Reset the scanline reader to its initial state. | |
| virtual ScanlineStatus | InitializeWithStatus (const void *image_buffer, size_t buffer_length) |
| virtual ScanlineStatus | ReadNextScanlineWithStatus (void **out_scanline_bytes) |
| virtual size_t | GetBytesPerScanline () |
| Return the number of bytes in a row (without padding). | |
| virtual bool | HasMoreScanLines () |
| Returns true if there are more scanlines to read. | |
| virtual PixelFormat | GetPixelFormat () |
| Returns the pixel format that need to be used by writer. | |
| virtual size_t | GetImageHeight () |
| Returns the height of the image. | |
| virtual size_t | GetImageWidth () |
| Returns the width of the image. | |
| virtual bool | IsProgressive () |
| WebP does not have progressive mode. | |
 Public Member Functions inherited from pagespeed::image_compression::ScanlineReaderInterface | |
| bool | Initialize (const void *image_buffer, size_t buffer_length) |
| bool | ReadNextScanline (void **out_scanline_bytes) |
WebpScanlineReader decodes WebP images. It returns a scanline (a row of pixels) each time it is called. The output format is RGB_888 if the input image does not have alpha channel, or RGBA_8888 otherwise. Animated WebP is not supported.
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Initialize the reader with the given image stream. Note that image_buffer must remain unchanged until the first call to ReadNextScanline().
Implements pagespeed::image_compression::ScanlineReaderInterface.
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Return the next row of pixels. The entire image is decoded the first time ReadNextScanline() is called, but only one scanline is returned for each call.
Implements pagespeed::image_compression::ScanlineReaderInterface.
1.8.6