| // Copyright 2012 Google Inc. All Rights Reserved. |
| // |
| // Use of this source code is governed by a BSD-style license |
| // that can be found in the COPYING file in the root of the source |
| // tree. An additional intellectual property rights grant can be found |
| // in the file PATENTS. All contributing project authors may |
| // be found in the AUTHORS file in the root of the source tree. |
| // ----------------------------------------------------------------------------- |
| // |
| // Misc. common utility functions |
| // |
| // Authors: Skal (pascal.massimino@gmail.com) |
| // Urvang (urvang@google.com) |
| |
| #ifndef WEBP_UTILS_UTILS_H_ |
| #define WEBP_UTILS_UTILS_H_ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "src/webp/config.h" |
| #endif |
| |
| #if defined(STARBOARD) |
| #include "starboard/common/log.h" |
| #include "starboard/memory.h" |
| #else |
| #include <assert.h> |
| #include <limits.h> |
| #endif |
| |
| #include "src/dsp/dsp.h" |
| #include "src/webp/types.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| //------------------------------------------------------------------------------ |
| // Memory allocation |
| |
| // This is the maximum memory amount that libwebp will ever try to allocate. |
| #ifndef WEBP_MAX_ALLOCABLE_MEMORY |
| #if SIZE_MAX > (1ULL << 34) |
| #define WEBP_MAX_ALLOCABLE_MEMORY (1ULL << 34) |
| #else |
| // For 32-bit targets keep this below INT_MAX to avoid valgrind warnings. |
| #define WEBP_MAX_ALLOCABLE_MEMORY ((1ULL << 31) - (1 << 16)) |
| #endif |
| #endif // WEBP_MAX_ALLOCABLE_MEMORY |
| |
| // size-checking safe malloc/calloc: verify that the requested size is not too |
| // large, or return NULL. You don't need to call these for constructs like |
| // malloc(sizeof(foo)), but only if there's picture-dependent size involved |
| // somewhere (like: malloc(num_pixels * sizeof(*something))). That's why this |
| // safe malloc() borrows the signature from calloc(), pointing at the dangerous |
| // underlying multiply involved. |
| WEBP_EXTERN void* WebPSafeMalloc(uint64_t nmemb, size_t size); |
| // Note that WebPSafeCalloc() expects the second argument type to be 'size_t' |
| // in order to favor the "calloc(num_foo, sizeof(foo))" pattern. |
| WEBP_EXTERN void* WebPSafeCalloc(uint64_t nmemb, size_t size); |
| |
| // Companion deallocation function to the above allocations. |
| WEBP_EXTERN void WebPSafeFree(void* const ptr); |
| |
| //------------------------------------------------------------------------------ |
| // Alignment |
| |
| #define WEBP_ALIGN_CST 31 |
| #define WEBP_ALIGN(PTR) (((uintptr_t)(PTR) + WEBP_ALIGN_CST) & ~WEBP_ALIGN_CST) |
| |
| #if !defined(STARBOARD) |
| #include <string.h> |
| #endif |
| |
| // memcpy() is the safe way of moving potentially unaligned 32b memory. |
| static WEBP_INLINE uint32_t WebPMemToUint32(const uint8_t* const ptr) { |
| uint32_t A; |
| memcpy(&A, ptr, sizeof(A)); |
| return A; |
| } |
| static WEBP_INLINE void WebPUint32ToMem(uint8_t* const ptr, uint32_t val) { |
| memcpy(ptr, &val, sizeof(val)); |
| } |
| |
| //------------------------------------------------------------------------------ |
| // Reading/writing data. |
| |
| // Read 16, 24 or 32 bits stored in little-endian order. |
| static WEBP_INLINE int GetLE16(const uint8_t* const data) { |
| return (int)(data[0] << 0) | (data[1] << 8); |
| } |
| |
| static WEBP_INLINE int GetLE24(const uint8_t* const data) { |
| return GetLE16(data) | (data[2] << 16); |
| } |
| |
| static WEBP_INLINE uint32_t GetLE32(const uint8_t* const data) { |
| return GetLE16(data) | ((uint32_t)GetLE16(data + 2) << 16); |
| } |
| |
| // Store 16, 24 or 32 bits in little-endian order. |
| static WEBP_INLINE void PutLE16(uint8_t* const data, int val) { |
| SB_DCHECK(val < (1 << 16)); |
| data[0] = (val >> 0); |
| data[1] = (val >> 8); |
| } |
| |
| static WEBP_INLINE void PutLE24(uint8_t* const data, int val) { |
| SB_DCHECK(val < (1 << 24)); |
| PutLE16(data, val & 0xffff); |
| data[2] = (val >> 16); |
| } |
| |
| static WEBP_INLINE void PutLE32(uint8_t* const data, uint32_t val) { |
| PutLE16(data, (int)(val & 0xffff)); |
| PutLE16(data + 2, (int)(val >> 16)); |
| } |
| |
| // Returns 31 ^ clz(n) = log2(n). This is the default C-implementation, either |
| // based on table or not. Can be used as fallback if clz() is not available. |
| #define WEBP_NEED_LOG_TABLE_8BIT |
| extern const uint8_t WebPLogTable8bit[256]; |
| static WEBP_INLINE int WebPLog2FloorC(uint32_t n) { |
| int log_value = 0; |
| while (n >= 256) { |
| log_value += 8; |
| n >>= 8; |
| } |
| return log_value + WebPLogTable8bit[n]; |
| } |
| |
| // Returns (int)floor(log2(n)). n must be > 0. |
| // use GNU builtins where available. |
| #if !defined(STARBOARD) && defined(__GNUC__) && \ |
| ((__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4) |
| static WEBP_INLINE int BitsLog2Floor(uint32_t n) { |
| return 31 ^ __builtin_clz(n); |
| } |
| #elif !defined(STARBOARD) && defined(_MSC_VER) && _MSC_VER > 1310 && \ |
| (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; |
| _BitScanReverse(&first_set_bit, n); |
| return first_set_bit; |
| } |
| #else // default: use the C-version. |
| static WEBP_INLINE int BitsLog2Floor(uint32_t n) { return WebPLog2FloorC(n); } |
| #endif |
| |
| //------------------------------------------------------------------------------ |
| // Pixel copying. |
| |
| struct WebPPicture; |
| |
| // Copy width x height pixels from 'src' to 'dst' honoring the strides. |
| WEBP_EXTERN void WebPCopyPlane(const uint8_t* src, int src_stride, |
| uint8_t* dst, int dst_stride, |
| int width, int height); |
| |
| // Copy ARGB pixels from 'src' to 'dst' honoring strides. 'src' and 'dst' are |
| // assumed to be already allocated and using ARGB data. |
| WEBP_EXTERN void WebPCopyPixels(const struct WebPPicture* const src, |
| struct WebPPicture* const dst); |
| |
| //------------------------------------------------------------------------------ |
| // Unique colors. |
| |
| // Returns count of unique colors in 'pic', assuming pic->use_argb is true. |
| // If the unique color count is more than MAX_PALETTE_SIZE, returns |
| // MAX_PALETTE_SIZE+1. |
| // If 'palette' is not NULL and number of unique colors is less than or equal to |
| // MAX_PALETTE_SIZE, also outputs the actual unique colors into 'palette'. |
| // Note: 'palette' is assumed to be an array already allocated with at least |
| // MAX_PALETTE_SIZE elements. |
| WEBP_EXTERN int WebPGetColorPalette(const struct WebPPicture* const pic, |
| uint32_t* const palette); |
| |
| //------------------------------------------------------------------------------ |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif /* WEBP_UTILS_UTILS_H_ */ |