Use the upstream version of libwebp, v0.4.3.

third_party/libwebp/enc/picture.c

+// 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 "./vp8enci.h"
+#include "../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, sizeof(*picture->argb));
+  if (memory == NULL) {
+    return WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
+  }
+  // TODO(skal): align plane to cache line?
+  picture->memory_argb_ = memory;
+  picture->argb = (uint32_t*)memory;
+  picture->argb_stride = width;
+  return 1;
+}
+
+int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height) {
+  const WebPEncCSP uv_csp = picture->colorspace & WEBP_CSP_UV_MASK;
+  const int has_alpha = picture->colorspace & WEBP_CSP_ALPHA_BIT;
+  const int y_stride = width;
+  const int uv_width = (width + 1) >> 1;
+  const int uv_height = (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 (!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(WebPEncodeBGR, WebPPictureImportBGR)
+ENCODE_FUNC(WebPEncodeRGBA, WebPPictureImportRGBA)
+ENCODE_FUNC(WebPEncodeBGRA, WebPPictureImportBGRA)
+
+#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(WebPEncodeLosslessBGR, WebPPictureImportBGR)
+LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessRGBA, WebPPictureImportRGBA)
+LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessBGRA, WebPPictureImportBGRA)
+
+#undef LOSSLESS_ENCODE_FUNC
+
+//------------------------------------------------------------------------------