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-rw-r--r--drivers/webpold/enc/backward_references.h212
1 files changed, 0 insertions, 212 deletions
diff --git a/drivers/webpold/enc/backward_references.h b/drivers/webpold/enc/backward_references.h
deleted file mode 100644
index 8006a56ba1..0000000000
--- a/drivers/webpold/enc/backward_references.h
+++ /dev/null
@@ -1,212 +0,0 @@
-// Copyright 2012 Google Inc. All Rights Reserved.
-//
-// This code is licensed under the same terms as WebM:
-// Software License Agreement: http://www.webmproject.org/license/software/
-// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
-// -----------------------------------------------------------------------------
-//
-// Author: Jyrki Alakuijala (jyrki@google.com)
-//
-
-#ifndef WEBP_ENC_BACKWARD_REFERENCES_H_
-#define WEBP_ENC_BACKWARD_REFERENCES_H_
-
-#include <assert.h>
-#include <stdlib.h>
-#include "../types.h"
-#include "../format_constants.h"
-
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
-// The spec allows 11, we use 9 bits to reduce memory consumption in encoding.
-// Having 9 instead of 11 only removes about 0.25 % of compression density.
-#define MAX_COLOR_CACHE_BITS 9
-
-// Max ever number of codes we'll use:
-#define PIX_OR_COPY_CODES_MAX \
- (NUM_LITERAL_CODES + NUM_LENGTH_CODES + (1 << MAX_COLOR_CACHE_BITS))
-
-// -----------------------------------------------------------------------------
-// PrefixEncode()
-
-// use GNU builtins where available.
-#if defined(__GNUC__) && \
- ((__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)
-static WEBP_INLINE int BitsLog2Floor(uint32_t n) {
- return n == 0 ? -1 : 31 ^ __builtin_clz(n);
-}
-#elif defined(_MSC_VER) && (defined(_M_X64) || defined(_M_IX86))
-#include <intrin.h>
-#pragma intrinsic(_BitScanReverse)
-
-static WEBP_INLINE int BitsLog2Floor(uint32_t n) {
- unsigned long first_set_bit;
- return _BitScanReverse(&first_set_bit, n) ? first_set_bit : -1;
-}
-#else
-static WEBP_INLINE int BitsLog2Floor(uint32_t n) {
- int log = 0;
- uint32_t value = n;
- int i;
-
- if (value == 0) return -1;
- for (i = 4; i >= 0; --i) {
- const int shift = (1 << i);
- const uint32_t x = value >> shift;
- if (x != 0) {
- value = x;
- log += shift;
- }
- }
- return log;
-}
-#endif
-
-static WEBP_INLINE int VP8LBitsLog2Ceiling(uint32_t n) {
- const int floor = BitsLog2Floor(n);
- if (n == (n & ~(n - 1))) // zero or a power of two.
- return floor;
- else
- return floor + 1;
-}
-
-// Splitting of distance and length codes into prefixes and
-// extra bits. The prefixes are encoded with an entropy code
-// while the extra bits are stored just as normal bits.
-static WEBP_INLINE void PrefixEncode(int distance, int* const code,
- int* const extra_bits_count,
- int* const extra_bits_value) {
- // Collect the two most significant bits where the highest bit is 1.
- const int highest_bit = BitsLog2Floor(--distance);
- // & 0x3f is to make behavior well defined when highest_bit
- // does not exist or is the least significant bit.
- const int second_highest_bit =
- (distance >> ((highest_bit - 1) & 0x3f)) & 1;
- *extra_bits_count = (highest_bit > 0) ? (highest_bit - 1) : 0;
- *extra_bits_value = distance & ((1 << *extra_bits_count) - 1);
- *code = (highest_bit > 0) ? (2 * highest_bit + second_highest_bit)
- : (highest_bit == 0) ? 1 : 0;
-}
-
-// -----------------------------------------------------------------------------
-// PixOrCopy
-
-enum Mode {
- kLiteral,
- kCacheIdx,
- kCopy,
- kNone
-};
-
-typedef struct {
- // mode as uint8_t to make the memory layout to be exactly 8 bytes.
- uint8_t mode;
- uint16_t len;
- uint32_t argb_or_distance;
-} PixOrCopy;
-
-static WEBP_INLINE PixOrCopy PixOrCopyCreateCopy(uint32_t distance,
- uint16_t len) {
- PixOrCopy retval;
- retval.mode = kCopy;
- retval.argb_or_distance = distance;
- retval.len = len;
- return retval;
-}
-
-static WEBP_INLINE PixOrCopy PixOrCopyCreateCacheIdx(int idx) {
- PixOrCopy retval;
- assert(idx >= 0);
- assert(idx < (1 << MAX_COLOR_CACHE_BITS));
- retval.mode = kCacheIdx;
- retval.argb_or_distance = idx;
- retval.len = 1;
- return retval;
-}
-
-static WEBP_INLINE PixOrCopy PixOrCopyCreateLiteral(uint32_t argb) {
- PixOrCopy retval;
- retval.mode = kLiteral;
- retval.argb_or_distance = argb;
- retval.len = 1;
- return retval;
-}
-
-static WEBP_INLINE int PixOrCopyIsLiteral(const PixOrCopy* const p) {
- return (p->mode == kLiteral);
-}
-
-static WEBP_INLINE int PixOrCopyIsCacheIdx(const PixOrCopy* const p) {
- return (p->mode == kCacheIdx);
-}
-
-static WEBP_INLINE int PixOrCopyIsCopy(const PixOrCopy* const p) {
- return (p->mode == kCopy);
-}
-
-static WEBP_INLINE uint32_t PixOrCopyLiteral(const PixOrCopy* const p,
- int component) {
- assert(p->mode == kLiteral);
- return (p->argb_or_distance >> (component * 8)) & 0xff;
-}
-
-static WEBP_INLINE uint32_t PixOrCopyLength(const PixOrCopy* const p) {
- return p->len;
-}
-
-static WEBP_INLINE uint32_t PixOrCopyArgb(const PixOrCopy* const p) {
- assert(p->mode == kLiteral);
- return p->argb_or_distance;
-}
-
-static WEBP_INLINE uint32_t PixOrCopyCacheIdx(const PixOrCopy* const p) {
- assert(p->mode == kCacheIdx);
- assert(p->argb_or_distance < (1U << MAX_COLOR_CACHE_BITS));
- return p->argb_or_distance;
-}
-
-static WEBP_INLINE uint32_t PixOrCopyDistance(const PixOrCopy* const p) {
- assert(p->mode == kCopy);
- return p->argb_or_distance;
-}
-
-// -----------------------------------------------------------------------------
-// VP8LBackwardRefs
-
-typedef struct {
- PixOrCopy* refs;
- int size; // currently used
- int max_size; // maximum capacity
-} VP8LBackwardRefs;
-
-// Initialize the object. Must be called first. 'refs' can be NULL.
-void VP8LInitBackwardRefs(VP8LBackwardRefs* const refs);
-
-// Release memory and re-initialize the object. 'refs' can be NULL.
-void VP8LClearBackwardRefs(VP8LBackwardRefs* const refs);
-
-// Allocate 'max_size' references. Returns false in case of memory error.
-int VP8LBackwardRefsAlloc(VP8LBackwardRefs* const refs, int max_size);
-
-// -----------------------------------------------------------------------------
-// Main entry points
-
-// Evaluates best possible backward references for specified quality.
-// Further optimize for 2D locality if use_2d_locality flag is set.
-int VP8LGetBackwardReferences(int width, int height,
- const uint32_t* const argb,
- int quality, int cache_bits, int use_2d_locality,
- VP8LBackwardRefs* const best);
-
-// Produce an estimate for a good color cache size for the image.
-int VP8LCalculateEstimateForCacheSize(const uint32_t* const argb,
- int xsize, int ysize,
- int* const best_cache_bits);
-
-#if defined(__cplusplus) || defined(c_plusplus)
-}
-#endif
-
-#endif // WEBP_ENC_BACKWARD_REFERENCES_H_
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