diff options
Diffstat (limited to 'src/3rdparty/libwebp/src/enc/histogram.h')
-rw-r--r-- | src/3rdparty/libwebp/src/enc/histogram.h | 37 |
1 files changed, 27 insertions, 10 deletions
diff --git a/src/3rdparty/libwebp/src/enc/histogram.h b/src/3rdparty/libwebp/src/enc/histogram.h index 4d346a8..1cf4c54 100644 --- a/src/3rdparty/libwebp/src/enc/histogram.h +++ b/src/3rdparty/libwebp/src/enc/histogram.h @@ -32,18 +32,21 @@ extern "C" { typedef struct { // literal_ contains green literal, palette-code and // copy-length-prefix histogram - int literal_[PIX_OR_COPY_CODES_MAX]; - int red_[256]; - int blue_[256]; - int alpha_[256]; + uint32_t* literal_; // Pointer to the allocated buffer for literal. + uint32_t red_[NUM_LITERAL_CODES]; + uint32_t blue_[NUM_LITERAL_CODES]; + uint32_t alpha_[NUM_LITERAL_CODES]; // Backward reference prefix-code histogram. - int distance_[NUM_DISTANCE_CODES]; + uint32_t distance_[NUM_DISTANCE_CODES]; int palette_code_bits_; - double bit_cost_; // cached value of VP8LHistogramEstimateBits(this) + double bit_cost_; // cached value of VP8LHistogramEstimateBits(this) + double literal_cost_; // Cached values of dominant entropy costs: + double red_cost_; // literal, red & blue. + double blue_cost_; } VP8LHistogram; // Collection of histograms with fixed capacity, allocated as one -// big memory chunk. Can be destroyed by simply calling 'free()'. +// big memory chunk. Can be destroyed by calling WebPSafeFree(). typedef struct { int size; // number of slots currently in use int max_size; // maximum capacity @@ -59,6 +62,9 @@ void VP8LHistogramCreate(VP8LHistogram* const p, const VP8LBackwardRefs* const refs, int palette_code_bits); +// Return the size of the histogram for a given palette_code_bits. +int VP8LGetHistogramSize(int palette_code_bits); + // Set the palette_code_bits and reset the stats. void VP8LHistogramInit(VP8LHistogram* const p, int palette_code_bits); @@ -66,10 +72,21 @@ void VP8LHistogramInit(VP8LHistogram* const p, int palette_code_bits); void VP8LHistogramStoreRefs(const VP8LBackwardRefs* const refs, VP8LHistogram* const histo); +// Free the memory allocated for the histogram. +void VP8LFreeHistogram(VP8LHistogram* const histo); + +// Free the memory allocated for the histogram set. +void VP8LFreeHistogramSet(VP8LHistogramSet* const histo); + // Allocate an array of pointer to histograms, allocated and initialized // using 'cache_bits'. Return NULL in case of memory error. VP8LHistogramSet* VP8LAllocateHistogramSet(int size, int cache_bits); +// Allocate and initialize histogram object with specified 'cache_bits'. +// Returns NULL in case of memory error. +// Special case of VP8LAllocateHistogramSet, with size equals 1. +VP8LHistogram* VP8LAllocateHistogram(int cache_bits); + // Accumulate a token 'v' into a histogram. void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo, const PixOrCopy* const v); @@ -82,9 +99,9 @@ double VP8LHistogramEstimateBits(const VP8LHistogram* const p); // represent the entropy code itself. double VP8LHistogramEstimateBitsBulk(const VP8LHistogram* const p); -static WEBP_INLINE int VP8LHistogramNumCodes(const VP8LHistogram* const p) { - return 256 + NUM_LENGTH_CODES + - ((p->palette_code_bits_ > 0) ? (1 << p->palette_code_bits_) : 0); +static WEBP_INLINE int VP8LHistogramNumCodes(int palette_code_bits) { + return NUM_LITERAL_CODES + NUM_LENGTH_CODES + + ((palette_code_bits > 0) ? (1 << palette_code_bits) : 0); } // Builds the histogram image. |