// Copyright 2011 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.
// -----------------------------------------------------------------------------
//
// WebPPicture class basis
//
// Author: Skal (pascal.massimino@gmail.com)
#include <assert.h>
#include <stdlib.h>
#include "src/enc/vp8i_enc.h"
#include "src/dsp/dsp.h"
#include "src/utils/utils.h"
//------------------------------------------------------------------------------
// WebPPicture
//------------------------------------------------------------------------------
static int DummyWriter(const uint8_t* data, size_t data_size,
const WebPPicture* const picture) {
// The following are to prevent 'unused variable' error message.
(void)data;
(void)data_size;
(void)picture;
return 1;
}
int WebPPictureInitInternal(WebPPicture* picture, int version) {
if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_ENCODER_ABI_VERSION)) {
return 0; // caller/system version mismatch!
}
if (picture != NULL) {
memset(picture, 0, sizeof(*picture));
picture->writer = DummyWriter;
WebPEncodingSetError(picture, VP8_ENC_OK);
}
return 1;
}
//------------------------------------------------------------------------------
static void WebPPictureResetBufferARGB(WebPPicture* const picture) {
picture->memory_argb_ = NULL;
picture->argb = NULL;
picture->argb_stride = 0;
}
static void WebPPictureResetBufferYUVA(WebPPicture* const picture) {
picture->memory_ = NULL;
picture->y = picture->u = picture->v = picture->a = NULL;
picture->y_stride = picture->uv_stride = 0;
picture->a_stride = 0;
}
void WebPPictureResetBuffers(WebPPicture* const picture) {
WebPPictureResetBufferARGB(picture);
WebPPictureResetBufferYUVA(picture);
}
int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height) {
void* memory;
const uint64_t argb_size = (uint64_t)width * height;
assert(picture != NULL);
WebPSafeFree(picture->memory_argb_);
WebPPictureResetBufferARGB(picture);
if (width <= 0 || height <= 0) {
return WebPEncodingSetError(picture, VP8_ENC_ERROR_BAD_DIMENSION);
}
// allocate a new buffer.
memory = WebPSafeMalloc(argb_size + WEBP_ALIGN_CST, sizeof(*picture->argb));
if (memory == NULL) {
return WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
}
picture->memory_argb_ = memory;
picture->argb = (uint32_t*)WEBP_ALIGN(memory);
picture->argb_stride = width;
return 1;
}
int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height) {
const WebPEncCSP uv_csp =
(WebPEncCSP)((int)picture->colorspace & WEBP_CSP_UV_MASK);
const int has_alpha = (int)picture->colorspace & WEBP_CSP_ALPHA_BIT;
const int y_stride = width;
const int uv_width = (int)(((int64_t)width + 1) >> 1);
const int uv_height = (int)(((int64_t)height + 1) >> 1);
const int uv_stride = uv_width;
int a_width, a_stride;
uint64_t y_size, uv_size, a_size, total_size;
uint8_t* mem;
assert(picture != NULL);
WebPSafeFree(picture->memory_);
WebPPictureResetBufferYUVA(picture);
if (uv_csp != WEBP_YUV420) {
return WebPEncodingSetError(picture, VP8_ENC_ERROR_INVALID_CONFIGURATION);
}
// alpha
a_width = has_alpha ? width : 0;
a_stride = a_width;
y_size = (uint64_t)y_stride * height;
uv_size = (uint64_t)uv_stride * uv_height;
a_size = (uint64_t)a_stride * height;
total_size = y_size + a_size + 2 * uv_size;
// Security and validation checks
if (width <= 0 || height <= 0 || // luma/alpha param error
uv_width <= 0 || uv_height <= 0) { // u/v param error
return WebPEncodingSetError(picture, VP8_ENC_ERROR_BAD_DIMENSION);
}
// allocate a new buffer.
mem = (uint8_t*)WebPSafeMalloc(total_size, sizeof(*mem));
if (mem == NULL) {
return WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
}
// From now on, we're in the clear, we can no longer fail...
picture->memory_ = (void*)mem;
picture->y_stride = y_stride;
picture->uv_stride = uv_stride;
picture->a_stride = a_stride;
// TODO(skal): we could align the y/u/v planes and adjust stride.
picture->y = mem;
mem += y_size;
picture->u = mem;
mem += uv_size;
picture->v = mem;
mem += uv_size;
if (a_size > 0) {
picture->a = mem;
mem += a_size;
}
(void)mem; // makes the static analyzer happy
return 1;
}
int WebPPictureAlloc(WebPPicture* picture) {
if (picture != NULL) {
const int width = picture->width;
const int height = picture->height;
WebPPictureFree(picture); // erase previous buffer
if (!picture->use_argb) {
return WebPPictureAllocYUVA(picture, width, height);
} else {
return WebPPictureAllocARGB(picture, width, height);
}
}
return 1;
}
void WebPPictureFree(WebPPicture* picture) {
if (picture != NULL) {
WebPSafeFree(picture->memory_);
WebPSafeFree(picture->memory_argb_);
WebPPictureResetBuffers(picture);
}
}
//------------------------------------------------------------------------------
// WebPMemoryWriter: Write-to-memory
void WebPMemoryWriterInit(WebPMemoryWriter* writer) {
writer->mem = NULL;
writer->size = 0;
writer->max_size = 0;
}
int WebPMemoryWrite(const uint8_t* data, size_t data_size,
const WebPPicture* picture) {
WebPMemoryWriter* const w = (WebPMemoryWriter*)picture->custom_ptr;
uint64_t next_size;
if (w == NULL) {
return 1;
}
next_size = (uint64_t)w->size + data_size;
if (next_size > w->max_size) {
uint8_t* new_mem;
uint64_t next_max_size = 2ULL * w->max_size;
if (next_max_size < next_size) next_max_size = next_size;
if (next_max_size < 8192ULL) next_max_size = 8192ULL;
new_mem = (uint8_t*)WebPSafeMalloc(next_max_size, 1);
if (new_mem == NULL) {
return 0;
}
if (w->size > 0) {
memcpy(new_mem, w->mem, w->size);
}
WebPSafeFree(w->mem);
w->mem = new_mem;
// down-cast is ok, thanks to WebPSafeMalloc
w->max_size = (size_t)next_max_size;
}
if (data_size > 0) {
memcpy(w->mem + w->size, data, data_size);
w->size += data_size;
}
return 1;
}
void WebPMemoryWriterClear(WebPMemoryWriter* writer) {
if (writer != NULL) {
WebPSafeFree(writer->mem);
writer->mem = NULL;
writer->size = 0;
writer->max_size = 0;
}
}
//------------------------------------------------------------------------------
// Simplest high-level calls:
typedef int (*Importer)(WebPPicture* const, const uint8_t* const, int);
static size_t Encode(const uint8_t* rgba, int width, int height, int stride,
Importer import, float quality_factor, int lossless,
uint8_t** output) {
WebPPicture pic;
WebPConfig config;
WebPMemoryWriter wrt;
int ok;
if (output == NULL) return 0;
if (!WebPConfigPreset(&config, WEBP_PRESET_DEFAULT, quality_factor) ||
!WebPPictureInit(&pic)) {
return 0; // shouldn't happen, except if system installation is broken
}
config.lossless = !!lossless;
pic.use_argb = !!lossless;
pic.width = width;
pic.height = height;
pic.writer = WebPMemoryWrite;
pic.custom_ptr = &wrt;
WebPMemoryWriterInit(&wrt);
ok = import(&pic, rgba, stride) && WebPEncode(&config, &pic);
WebPPictureFree(&pic);
if (!ok) {
WebPMemoryWriterClear(&wrt);
*output = NULL;
return 0;
}
*output = wrt.mem;
return wrt.size;
}
#define ENCODE_FUNC(NAME, IMPORTER) \
size_t NAME(const uint8_t* in, int w, int h, int bps, float q, \
uint8_t** out) { \
return Encode(in, w, h, bps, IMPORTER, q, 0, out); \
}
ENCODE_FUNC(WebPEncodeRGB, WebPPictureImportRGB)
ENCODE_FUNC(WebPEncodeRGBA, WebPPictureImportRGBA)
#if !defined(WEBP_REDUCE_CSP)
ENCODE_FUNC(WebPEncodeBGR, WebPPictureImportBGR)
ENCODE_FUNC(WebPEncodeBGRA, WebPPictureImportBGRA)
#endif // WEBP_REDUCE_CSP
#undef ENCODE_FUNC
#define LOSSLESS_DEFAULT_QUALITY 70.
#define LOSSLESS_ENCODE_FUNC(NAME, IMPORTER) \
size_t NAME(const uint8_t* in, int w, int h, int bps, uint8_t** out) { \
return Encode(in, w, h, bps, IMPORTER, LOSSLESS_DEFAULT_QUALITY, 1, out); \
}
LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessRGB, WebPPictureImportRGB)
LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessRGBA, WebPPictureImportRGBA)
#if !defined(WEBP_REDUCE_CSP)
LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessBGR, WebPPictureImportBGR)
LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessBGRA, WebPPictureImportBGRA)
#endif // WEBP_REDUCE_CSP
#undef LOSSLESS_ENCODE_FUNC
//------------------------------------------------------------------------------