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Rescale: let ImportRow / ExportRow be pointer-to-function

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Separate the C version from the MIPS32 version and have run-time
initialization during RescalerInit()

Change-Id: I93cfa5691c073a099fe62eda1333ad2bb749915b
This commit is contained in:
Pascal Massimino
2014-02-17 00:58:17 -08:00
parent 9cba963f9a
commit b7685d73fe
4 changed files with 96 additions and 68 deletions
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16
src/utils/rescaler.h
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@ -52,26 +52,24 @@ void WebPRescalerInit(WebPRescaler* const rescaler,
int WebPRescaleNeededLines(const WebPRescaler* const rescaler,
int max_num_lines);
// Import a row of data and save its contribution in the rescaler.
// 'channel' denotes the channel number to be imported.
void WebPRescalerImportRow(WebPRescaler* const rescaler,
const uint8_t* const src, int channel);
// Import multiple rows over all channels, until at least one row is ready to
// be exported. Returns the actual number of lines that were imported.
int WebPRescalerImport(WebPRescaler* const rescaler, int num_rows,
const uint8_t* src, int src_stride);
// Import a row of data and save its contribution in the rescaler.
// 'channel' denotes the channel number to be imported.
extern void (*WebPRescalerImportRow)(WebPRescaler* const wrk,
const uint8_t* const src, int channel);
// Export one row (starting at x_out position) from rescaler.
extern void (*WebPRescalerExportRow)(WebPRescaler* const wrk, int x_out);
// Return true if there is pending output rows ready.
static WEBP_INLINE
int WebPRescalerHasPendingOutput(const WebPRescaler* const rescaler) {
return (rescaler->y_accum <= 0);
}
// Export one row from rescaler. Returns the pointer where output was written,
// or NULL if no row was pending.
uint8_t* WebPRescalerExportRow(WebPRescaler* const rescaler);
// Export as many rows as possible. Return the numbers of rows written.
int WebPRescalerExport(WebPRescaler* const rescaler);