Move the JPEG and PNG codecs from base/gfx to app/gfx/codec. Move the classes...

base/gfx/png_encoder.cc

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/basictypes.h"
-#include "base/gfx/png_encoder.h"
-#include "base/logging.h"
-#include "base/scoped_ptr.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-#include "third_party/skia/include/core/SkUnPreMultiply.h"
-
-extern "C" {
-#if defined(USE_SYSTEM_LIBPNG)
-#include <png.h>
-#else
-#include "third_party/libpng/png.h"
-#endif
-}
-
-namespace {
-
-// Converts BGRA->RGBA and RGBA->BGRA.
-void ConvertBetweenBGRAandRGBA(const unsigned char* input, int pixel_width,
-                               unsigned char* output) {
-  for (int x = 0; x < pixel_width; x++) {
-    const unsigned char* pixel_in = &input[x * 4];
-    unsigned char* pixel_out = &output[x * 4];
-    pixel_out[0] = pixel_in[2];
-    pixel_out[1] = pixel_in[1];
-    pixel_out[2] = pixel_in[0];
-    pixel_out[3] = pixel_in[3];
-  }
-}
-
-void ConvertRGBAtoRGB(const unsigned char* rgba, int pixel_width,
-                      unsigned char* rgb) {
-  for (int x = 0; x < pixel_width; x++) {
-    const unsigned char* pixel_in = &rgba[x * 4];
-    unsigned char* pixel_out = &rgb[x * 3];
-    pixel_out[0] = pixel_in[0];
-    pixel_out[1] = pixel_in[1];
-    pixel_out[2] = pixel_in[2];
-  }
-}
-
-}  // namespace
-
-// Encoder --------------------------------------------------------------------
-//
-// This section of the code is based on nsPNGEncoder.cpp in Mozilla
-// (Copyright 2005 Google Inc.)
-
-namespace {
-
-// Passed around as the io_ptr in the png structs so our callbacks know where
-// to write data.
-struct PngEncoderState {
-  PngEncoderState(std::vector<unsigned char>* o) : out(o) {}
-  std::vector<unsigned char>* out;
-};
-
-// Called by libpng to flush its internal buffer to ours.
-void EncoderWriteCallback(png_structp png, png_bytep data, png_size_t size) {
-  PngEncoderState* state = static_cast<PngEncoderState*>(png_get_io_ptr(png));
-  DCHECK(state->out);
-
-  size_t old_size = state->out->size();
-  state->out->resize(old_size + size);
-  memcpy(&(*state->out)[old_size], data, size);
-}
-
-void ConvertBGRAtoRGB(const unsigned char* bgra, int pixel_width,
-                      unsigned char* rgb) {
-  for (int x = 0; x < pixel_width; x++) {
-    const unsigned char* pixel_in = &bgra[x * 4];
-    unsigned char* pixel_out = &rgb[x * 3];
-    pixel_out[0] = pixel_in[2];
-    pixel_out[1] = pixel_in[1];
-    pixel_out[2] = pixel_in[0];
-  }
-}
-
-// Automatically destroys the given write structs on destruction to make
-// cleanup and error handling code cleaner.
-class PngWriteStructDestroyer {
- public:
-  PngWriteStructDestroyer(png_struct** ps, png_info** pi) : ps_(ps), pi_(pi) {
-  }
-  ~PngWriteStructDestroyer() {
-    png_destroy_write_struct(ps_, pi_);
-  }
- private:
-  png_struct** ps_;
-  png_info** pi_;
-
-  DISALLOW_EVIL_CONSTRUCTORS(PngWriteStructDestroyer);
-};
-
-}  // namespace
-
-// static
-bool PNGEncoder::Encode(const unsigned char* input, ColorFormat format,
-                      int w, int h, int row_byte_width,
-                      bool discard_transparency,
-                      std::vector<unsigned char>* output) {
-  // Run to convert an input row into the output row format, NULL means no
-  // conversion is necessary.
-  void (*converter)(const unsigned char* in, int w, unsigned char* out) = NULL;
-
-  int input_color_components, output_color_components;
-  int png_output_color_type;
-  switch (format) {
-    case FORMAT_RGB:
-      input_color_components = 3;
-      output_color_components = 3;
-      png_output_color_type = PNG_COLOR_TYPE_RGB;
-      discard_transparency = false;
-      break;
-
-    case FORMAT_RGBA:
-      input_color_components = 4;
-      if (discard_transparency) {
-        output_color_components = 3;
-        png_output_color_type = PNG_COLOR_TYPE_RGB;
-        converter = ConvertRGBAtoRGB;
-      } else {
-        output_color_components = 4;
-        png_output_color_type = PNG_COLOR_TYPE_RGB_ALPHA;
-        converter = NULL;
-      }
-      break;
-
-    case FORMAT_BGRA:
-      input_color_components = 4;
-      if (discard_transparency) {
-        output_color_components = 3;
-        png_output_color_type = PNG_COLOR_TYPE_RGB;
-        converter = ConvertBGRAtoRGB;
-      } else {
-        output_color_components = 4;
-        png_output_color_type = PNG_COLOR_TYPE_RGB_ALPHA;
-        converter = ConvertBetweenBGRAandRGBA;
-      }
-      break;
-
-    default:
-      NOTREACHED() << "Unknown pixel format";
-      return false;
-  }
-
-  // Row stride should be at least as long as the length of the data.
-  DCHECK(input_color_components * w <= row_byte_width);
-
-  png_struct* png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
-                                                png_voidp_NULL,
-                                                png_error_ptr_NULL,
-                                                png_error_ptr_NULL);
-  if (!png_ptr)
-    return false;
-  png_info* info_ptr = png_create_info_struct(png_ptr);
-  if (!info_ptr) {
-    png_destroy_write_struct(&png_ptr, NULL);
-    return false;
-  }
-  PngWriteStructDestroyer destroyer(&png_ptr, &info_ptr);
-
-  if (setjmp(png_jmpbuf(png_ptr))) {
-    // The destroyer will ensure that the structures are cleaned up in this
-    // case, even though we may get here as a jump from random parts of the
-    // PNG library called below.
-    return false;
-  }
-
-  // Set our callback for libpng to give us the data.
-  PngEncoderState state(output);
-  png_set_write_fn(png_ptr, &state, EncoderWriteCallback, NULL);
-
-  png_set_IHDR(png_ptr, info_ptr, w, h, 8, png_output_color_type,
-               PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
-               PNG_FILTER_TYPE_DEFAULT);
-  png_write_info(png_ptr, info_ptr);
-
-  if (!converter) {
-    // No conversion needed, give the data directly to libpng.
-    for (int y = 0; y < h; y ++)
-      png_write_row(png_ptr,
-                    const_cast<unsigned char*>(&input[y * row_byte_width]));
-  } else {
-    // Needs conversion using a separate buffer.
-    unsigned char* row = new unsigned char[w * output_color_components];
-    for (int y = 0; y < h; y ++) {
-      converter(&input[y * row_byte_width], w, row);
-      png_write_row(png_ptr, row);
-    }
-    delete[] row;
-  }
-
-  png_write_end(png_ptr, info_ptr);
-  return true;
-}
-
-// static
-bool PNGEncoder::EncodeBGRASkBitmap(const SkBitmap& input,
-                                    bool discard_transparency,
-                                    std::vector<unsigned char>* output) {
-  static const int bbp = 4;
-
-  SkAutoLockPixels lock_input(input);
-  DCHECK(input.empty() || input.bytesPerPixel() == bbp);
-
-  // SkBitmaps are premultiplied, we need to unpremultiply them.
-  scoped_array<unsigned char> divided(
-      new unsigned char[input.width() * input.height() * bbp]);
-
-  int i = 0;
-  for (int y = 0; y < input.height(); y++) {
-    for (int x = 0; x < input.width(); x++) {
-      uint32 pixel = input.getAddr32(0, y)[x];
-
-      int alpha = SkColorGetA(pixel);
-      if (alpha != 0 && alpha != 255) {
-        SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(pixel);
-        divided[i + 0] = SkColorGetR(unmultiplied);
-        divided[i + 1] = SkColorGetG(unmultiplied);
-        divided[i + 2] = SkColorGetB(unmultiplied);
-        divided[i + 3] = alpha;
-      } else {
-        divided[i + 0] = SkColorGetR(pixel);
-        divided[i + 1] = SkColorGetG(pixel);
-        divided[i + 2] = SkColorGetB(pixel);
-        divided[i + 3] = alpha;
-      }
-      i += bbp;
-    }
-  }
-
-  return Encode(divided.get(),
-                PNGEncoder::FORMAT_RGBA, input.width(), input.height(),
-                input.width() * bbp, discard_transparency, output);
-}