generic-library/webp
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

fix rescaler vertical interpolation

Browse Source 
* vertical expansion now uses bilinear interpolation
  * heavily assumes that the alpha plane is decoded in full, not row-by-row
  * split the RescalerExportRow and RescalerImportRow methods into Shrink
    and Expand variants.
  * MIPS implementation of ExportRowExpand is missing.

There's room for extra speed optim and code re-org, but let's keep that for later patches.

addresses https://code.google.com/p/webp/issues/detail?id=254

Change-Id: I8f12b855342bf07dd467fe85e4fde5fd814effdb
This commit is contained in:
Pascal Massimino
2015-09-18 10:45:03 +02:00
committed by James Zern
parent cd82440ec7
commit 5ff0079ece
10 changed files with 553 additions and 388 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
src/dsp/dsp.h
View File

@@ -335,15 +335,35 @@ void WebPInitYUV444Converters(void);
struct WebPRescaler;
// Import a row of data and save its contribution in the rescaler.
// 'channel' denotes the channel number to be imported.
extern void (*WebPRescalerImportRow)(struct WebPRescaler* const wrk,
const uint8_t* const src, int channel);
// 'channel' denotes the channel number to be imported. 'Expand' corresponds to
// the wrk->x_expand case. Otherwise, 'Shrink' is to be used.
typedef void (*WebPRescalerImportRowFunc)(struct WebPRescaler* const wrk,
const uint8_t* const src,
int channel);
extern WebPRescalerImportRowFunc WebPRescalerImportRowExpand;
extern WebPRescalerImportRowFunc WebPRescalerImportRowShrink;
// Export one row (starting at x_out position) from rescaler.
extern void (*WebPRescalerExportRow)(struct WebPRescaler* const wrk, int x_out);
// 'Expand' corresponds to the wrk->y_expand case.
// Otherwise 'Shrink' is to be used
typedef void (*WebPRescalerExportRowFunc)(struct WebPRescaler* const wrk);
extern WebPRescalerExportRowFunc WebPRescalerExportRowExpand;
extern WebPRescalerExportRowFunc WebPRescalerExportRowShrink;
// Plain-C implementation, as fall-back.
extern void WebPRescalerExportRowC(struct WebPRescaler* const wrk, int x_out);
extern void WebPRescalerImportRowExpandC(struct WebPRescaler* const wrk,
const uint8_t* const src, int channel);
extern void WebPRescalerImportRowShrinkC(struct WebPRescaler* const wrk,
const uint8_t* const src, int channel);
extern void WebPRescalerExportRowExpandC(struct WebPRescaler* const wrk);
extern void WebPRescalerExportRowShrinkC(struct WebPRescaler* const wrk);
// Main entry calls:
extern void WebPRescalerImportRow(struct WebPRescaler* const wrk,
const uint8_t* const src, int channel);
// Export one row (starting at x_out position) from rescaler.
extern void WebPRescalerExportRow(struct WebPRescaler* const wrk);
// Must be called first before using the above.
void WebPRescalerDspInit(void);