| // Copyright (c) 2006-2009 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 "printing/image.h" |
| |
| #include "base/file_util.h" |
| #include "base/gfx/png_decoder.h" |
| #include "base/gfx/png_encoder.h" |
| #include "base/gfx/rect.h" |
| #include "base/string_util.h" |
| #include "printing/native_metafile.h" |
| #include "skia/ext/platform_device.h" |
| |
| #if defined(OS_WIN) |
| #include "base/gfx/gdi_util.h" // EMF support |
| #endif |
| |
| printing::Image::Image(const std::wstring& filename) : ignore_alpha_(true) { |
| std::string data; |
| file_util::ReadFileToString(filename, &data); |
| std::wstring ext = file_util::GetFileExtensionFromPath(filename); |
| bool success = false; |
| if (LowerCaseEqualsASCII(ext, "png")) { |
| success = LoadPng(data); |
| } else if (LowerCaseEqualsASCII(ext, "emf")) { |
| success = LoadMetafile(data); |
| } else { |
| DCHECK(false); |
| } |
| if (!success) { |
| size_.SetSize(0, 0); |
| row_length_ = 0; |
| data_.clear(); |
| } |
| } |
| |
| bool printing::Image::SaveToPng(const std::wstring& filename) { |
| DCHECK(!data_.empty()); |
| std::vector<unsigned char> compressed; |
| bool success = PNGEncoder::Encode(&*data_.begin(), |
| PNGEncoder::FORMAT_BGRA, |
| size_.width(), |
| size_.height(), |
| row_length_, |
| true, |
| &compressed); |
| DCHECK(success && compressed.size()); |
| if (success) { |
| int write_bytes = file_util::WriteFile( |
| filename, |
| reinterpret_cast<char*>(&*compressed.begin()), compressed.size()); |
| success = (write_bytes == static_cast<int>(compressed.size())); |
| DCHECK(success); |
| } |
| return success; |
| } |
| |
| double printing::Image::PercentageDifferent(const Image& rhs) const { |
| if (size_.width() == 0 || size_.height() == 0 || |
| rhs.size_.width() == 0 || rhs.size_.height() == 0) |
| return 100.; |
| |
| int width = std::min(size_.width(), rhs.size_.width()); |
| int height = std::min(size_.height(), rhs.size_.height()); |
| // Compute pixels different in the overlap |
| int pixels_different = 0; |
| for (int y = 0; y < height; ++y) { |
| for (int x = 0; x < width; ++x) { |
| uint32 lhs_pixel = pixel_at(x, y); |
| uint32 rhs_pixel = rhs.pixel_at(x, y); |
| if (lhs_pixel != rhs_pixel) |
| ++pixels_different; |
| } |
| |
| // Look for extra right lhs pixels. They should be white. |
| for (int x = width; x < size_.width(); ++x) { |
| uint32 lhs_pixel = pixel_at(x, y); |
| if (lhs_pixel != Color(SK_ColorWHITE)) |
| ++pixels_different; |
| } |
| |
| // Look for extra right rhs pixels. They should be white. |
| for (int x = width; x < rhs.size_.width(); ++x) { |
| uint32 rhs_pixel = rhs.pixel_at(x, y); |
| if (rhs_pixel != Color(SK_ColorWHITE)) |
| ++pixels_different; |
| } |
| } |
| |
| // Look for extra bottom lhs pixels. They should be white. |
| for (int y = height; y < size_.height(); ++y) { |
| for (int x = 0; x < size_.width(); ++x) { |
| uint32 lhs_pixel = pixel_at(x, y); |
| if (lhs_pixel != Color(SK_ColorWHITE)) |
| ++pixels_different; |
| } |
| } |
| |
| // Look for extra bottom rhs pixels. They should be white. |
| for (int y = height; y < rhs.size_.height(); ++y) { |
| for (int x = 0; x < rhs.size_.width(); ++x) { |
| uint32 rhs_pixel = rhs.pixel_at(x, y); |
| if (rhs_pixel != Color(SK_ColorWHITE)) |
| ++pixels_different; |
| } |
| } |
| |
| // Like the WebKit ImageDiff tool, we define percentage different in terms |
| // of the size of the 'actual' bitmap. |
| double total_pixels = static_cast<double>(size_.width()) * |
| static_cast<double>(height); |
| return static_cast<double>(pixels_different) / total_pixels * 100.; |
| } |
| |
| bool printing::Image::LoadPng(const std::string& compressed) { |
| int w; |
| int h; |
| bool success = PNGDecoder::Decode( |
| reinterpret_cast<const unsigned char*>(compressed.c_str()), |
| compressed.size(), PNGDecoder::FORMAT_BGRA, &data_, &w, &h); |
| size_.SetSize(w, h); |
| row_length_ = size_.width() * sizeof(uint32); |
| return success; |
| } |
| |
| bool printing::Image::LoadMetafile(const std::string& data) { |
| DCHECK(!data.empty()); |
| #if defined(OS_WIN) |
| printing::NativeMetafile metafile; |
| metafile.CreateFromData(data.data(), data.size()); |
| gfx::Rect rect(metafile.GetBounds()); |
| // Create a temporary HDC and bitmap to retrieve the rendered data. |
| HDC hdc = CreateCompatibleDC(NULL); |
| BITMAPV4HEADER hdr; |
| DCHECK_EQ(rect.x(), 0); |
| DCHECK_EQ(rect.y(), 0); |
| DCHECK_GT(rect.width(), 0); |
| DCHECK_GT(rect.height(), 0); |
| size_ = rect.size(); |
| gfx::CreateBitmapV4Header(rect.width(), rect.height(), &hdr); |
| void* bits; |
| HBITMAP bitmap = CreateDIBSection(hdc, |
| reinterpret_cast<BITMAPINFO*>(&hdr), 0, |
| &bits, NULL, 0); |
| DCHECK(bitmap); |
| DCHECK(SelectObject(hdc, bitmap)); |
| skia::PlatformDevice::InitializeDC(hdc); |
| bool success = metafile.Playback(hdc, NULL); |
| row_length_ = size_.width() * sizeof(uint32); |
| size_t bytes = row_length_ * size_.height(); |
| DCHECK(bytes); |
| data_.resize(bytes); |
| memcpy(&*data_.begin(), bits, bytes); |
| DeleteDC(hdc); |
| DeleteObject(bitmap); |
| return success; |
| #else |
| NOTIMPLEMENTED(); |
| return false; |
| #endif |
| } |