mirror of
https://github.com/webmproject/libwebp.git
synced 2024-12-28 14:38:21 +01:00
8666a93aae
- Fix the off-by-one diff when cropping with simple-filter. - Fix a bug in incremental decoding in case of alpha. - In VP8FinishRow(), do not decode alpha when y_start > y_end. - Correct output of alpha channel for MODE_ARGB. - Correct output of alpha channel for MODE_RGBA_4444. Change-Id: I785763a2a704b973cc742ad93ffbb53699d1fc0a
177 lines
6.5 KiB
C
177 lines
6.5 KiB
C
// Copyright 2011 Google Inc.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// Speed-critical functions.
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#ifndef WEBP_DSP_DSP_H_
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#define WEBP_DSP_DSP_H_
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#include "../webp/types.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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//------------------------------------------------------------------------------
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// CPU detection
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typedef enum {
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kSSE2,
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kSSE3,
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kNEON
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} CPUFeature;
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// returns true if the CPU supports the feature.
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typedef int (*VP8CPUInfo)(CPUFeature feature);
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extern VP8CPUInfo VP8GetCPUInfo;
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//------------------------------------------------------------------------------
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// Encoding
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int VP8GetAlpha(const int histo[]);
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// Transforms
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// VP8Idct: Does one of two inverse transforms. If do_two is set, the transforms
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// will be done for (ref, in, dst) and (ref + 4, in + 16, dst + 4).
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typedef void (*VP8Idct)(const uint8_t* ref, const int16_t* in, uint8_t* dst,
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int do_two);
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typedef void (*VP8Fdct)(const uint8_t* src, const uint8_t* ref, int16_t* out);
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typedef void (*VP8WHT)(const int16_t* in, int16_t* out);
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extern VP8Idct VP8ITransform;
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extern VP8Fdct VP8FTransform;
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extern VP8WHT VP8ITransformWHT;
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extern VP8WHT VP8FTransformWHT;
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// Predictions
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// *dst is the destination block. *top and *left can be NULL.
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typedef void (*VP8IntraPreds)(uint8_t *dst, const uint8_t* left,
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const uint8_t* top);
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typedef void (*VP8Intra4Preds)(uint8_t *dst, const uint8_t* top);
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extern VP8Intra4Preds VP8EncPredLuma4;
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extern VP8IntraPreds VP8EncPredLuma16;
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extern VP8IntraPreds VP8EncPredChroma8;
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typedef int (*VP8Metric)(const uint8_t* pix, const uint8_t* ref);
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extern VP8Metric VP8SSE16x16, VP8SSE16x8, VP8SSE8x8, VP8SSE4x4;
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typedef int (*VP8WMetric)(const uint8_t* pix, const uint8_t* ref,
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const uint16_t* const weights);
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extern VP8WMetric VP8TDisto4x4, VP8TDisto16x16;
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typedef void (*VP8BlockCopy)(const uint8_t* src, uint8_t* dst);
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extern VP8BlockCopy VP8Copy4x4;
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extern VP8BlockCopy VP8Copy8x8;
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extern VP8BlockCopy VP8Copy16x16;
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// Quantization
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struct VP8Matrix; // forward declaration
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typedef int (*VP8QuantizeBlock)(int16_t in[16], int16_t out[16],
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int n, const struct VP8Matrix* const mtx);
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extern VP8QuantizeBlock VP8EncQuantizeBlock;
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// Compute susceptibility based on DCT-coeff histograms:
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// the higher, the "easier" the macroblock is to compress.
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typedef int (*VP8CHisto)(const uint8_t* ref, const uint8_t* pred,
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int start_block, int end_block);
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extern const int VP8DspScan[16 + 4 + 4];
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extern VP8CHisto VP8CollectHistogram;
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void VP8EncDspInit(void); // must be called before using any of the above
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//------------------------------------------------------------------------------
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// Decoding
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typedef void (*VP8DecIdct)(const int16_t* coeffs, uint8_t* dst);
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// when doing two transforms, coeffs is actually int16_t[2][16].
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typedef void (*VP8DecIdct2)(const int16_t* coeffs, uint8_t* dst, int do_two);
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extern VP8DecIdct2 VP8Transform;
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extern VP8DecIdct VP8TransformUV;
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extern VP8DecIdct VP8TransformDC;
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extern VP8DecIdct VP8TransformDCUV;
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extern void (*VP8TransformWHT)(const int16_t* in, int16_t* out);
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// *dst is the destination block, with stride BPS. Boundary samples are
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// assumed accessible when needed.
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typedef void (*VP8PredFunc)(uint8_t* dst);
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extern VP8PredFunc VP8PredLuma16[/* NUM_B_DC_MODES */];
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extern VP8PredFunc VP8PredChroma8[/* NUM_B_DC_MODES */];
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extern VP8PredFunc VP8PredLuma4[/* NUM_BMODES */];
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// simple filter (only for luma)
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typedef void (*VP8SimpleFilterFunc)(uint8_t* p, int stride, int thresh);
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extern VP8SimpleFilterFunc VP8SimpleVFilter16;
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extern VP8SimpleFilterFunc VP8SimpleHFilter16;
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extern VP8SimpleFilterFunc VP8SimpleVFilter16i; // filter 3 inner edges
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extern VP8SimpleFilterFunc VP8SimpleHFilter16i;
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// regular filter (on both macroblock edges and inner edges)
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typedef void (*VP8LumaFilterFunc)(uint8_t* luma, int stride,
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int thresh, int ithresh, int hev_t);
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typedef void (*VP8ChromaFilterFunc)(uint8_t* u, uint8_t* v, int stride,
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int thresh, int ithresh, int hev_t);
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// on outer edge
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extern VP8LumaFilterFunc VP8VFilter16;
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extern VP8LumaFilterFunc VP8HFilter16;
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extern VP8ChromaFilterFunc VP8VFilter8;
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extern VP8ChromaFilterFunc VP8HFilter8;
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// on inner edge
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extern VP8LumaFilterFunc VP8VFilter16i; // filtering 3 inner edges altogether
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extern VP8LumaFilterFunc VP8HFilter16i;
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extern VP8ChromaFilterFunc VP8VFilter8i; // filtering u and v altogether
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extern VP8ChromaFilterFunc VP8HFilter8i;
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// must be called before anything using the above
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extern void VP8DspInit(void);
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//------------------------------------------------------------------------------
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// WebP I/O
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#define FANCY_UPSAMPLING // undefined to remove fancy upsampling support
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#ifdef FANCY_UPSAMPLING
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typedef void (*WebPUpsampleLinePairFunc)(
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const uint8_t* top_y, const uint8_t* bottom_y,
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const uint8_t* top_u, const uint8_t* top_v,
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const uint8_t* cur_u, const uint8_t* cur_v,
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uint8_t* top_dst, uint8_t* bottom_dst, int len);
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// Fancy upsampling functions to convert YUV to RGB(A) modes
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extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
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extern WebPUpsampleLinePairFunc WebPUpsamplersKeepAlpha[/* MODE_LAST */];
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// Initializes SSE2 version of the fancy upsamplers.
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void WebPInitUpsamplersSSE2(void);
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#endif // FANCY_UPSAMPLING
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// Point-sampling methods.
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typedef void (*WebPSampleLinePairFunc)(
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const uint8_t* top_y, const uint8_t* bottom_y,
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const uint8_t* u, const uint8_t* v,
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uint8_t* top_dst, uint8_t* bottom_dst, int len);
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extern const WebPSampleLinePairFunc WebPSamplers[/* MODE_LAST */];
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extern const WebPSampleLinePairFunc WebPSamplersKeepAlpha[/* MODE_LAST */];
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// YUV444->RGB converters
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typedef void (*WebPYUV444Converter)(const uint8_t* y,
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const uint8_t* u, const uint8_t* v,
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uint8_t* dst, int len);
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extern const WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */];
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// Main function to be called
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void WebPInitUpsamplers(void);
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//------------------------------------------------------------------------------
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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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#endif /* WEBP_DSP_DSP_H_ */
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