| /* |
| * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved. |
| * Copyright (C) 2008 Eric Seidel <eric@webkit.org> |
| * Copyright (C) 2013 Google, Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "platform/graphics/Pattern.h" |
| |
| #include <v8.h> |
| #include "SkCanvas.h" |
| #include "SkColorShader.h" |
| #include "platform/graphics/skia/SkiaUtils.h" |
| |
| |
| namespace WebCore { |
| |
| Pattern::Pattern(PassRefPtr<Image> image, bool repeatX, bool repeatY) |
| : m_repeatX(repeatX) |
| , m_repeatY(repeatY) |
| , m_externalMemoryAllocated(0) |
| { |
| if (image) { |
| m_tileImage = image->nativeImageForCurrentFrame(); |
| } |
| } |
| |
| Pattern::~Pattern() |
| { |
| if (m_externalMemoryAllocated) |
| v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(-m_externalMemoryAllocated); |
| } |
| |
| SkShader* Pattern::shader() |
| { |
| if (m_pattern) |
| return m_pattern.get(); |
| |
| SkMatrix localMatrix = affineTransformToSkMatrix(m_patternSpaceTransformation); |
| |
| // If we don't have a bitmap, return a transparent shader. |
| if (!m_tileImage) |
| m_pattern = adoptRef(new SkColorShader(SK_ColorTRANSPARENT)); |
| else if (m_repeatX && m_repeatY) |
| m_pattern = adoptRef(SkShader::CreateBitmapShader(m_tileImage->bitmap(), SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix)); |
| else { |
| // Skia does not have a "draw the tile only once" option. Clamp_TileMode |
| // repeats the last line of the image after drawing one tile. To avoid |
| // filling the space with arbitrary pixels, this workaround forces the |
| // image to have a line of transparent pixels on the "repeated" edge(s), |
| // thus causing extra space to be transparent filled. |
| SkShader::TileMode tileModeX = m_repeatX ? SkShader::kRepeat_TileMode : SkShader::kClamp_TileMode; |
| SkShader::TileMode tileModeY = m_repeatY ? SkShader::kRepeat_TileMode : SkShader::kClamp_TileMode; |
| int expandW = m_repeatX ? 0 : 1; |
| int expandH = m_repeatY ? 0 : 1; |
| |
| // Create a transparent bitmap 1 pixel wider and/or taller than the |
| // original, then copy the orignal into it. |
| // FIXME: Is there a better way to pad (not scale) an image in skia? |
| SkImageInfo info = m_tileImage->bitmap().info(); |
| info.fWidth += expandW; |
| info.fHeight += expandH; |
| // we explicitly require non-opaquness, since we are going to add a transparent strip. |
| info.fAlphaType = kPremul_SkAlphaType; |
| |
| SkBitmap bm2; |
| bm2.allocPixels(info); |
| bm2.eraseARGB(0x00, 0x00, 0x00, 0x00); |
| SkCanvas canvas(bm2); |
| canvas.drawBitmap(m_tileImage->bitmap(), 0, 0); |
| bm2.setImmutable(); |
| m_pattern = adoptRef(SkShader::CreateBitmapShader(bm2, tileModeX, tileModeY, &localMatrix)); |
| |
| // Clamp to int, since that's what the adjust function takes. |
| m_externalMemoryAllocated = static_cast<int>(std::min(static_cast<size_t>(INT_MAX), bm2.getSafeSize())); |
| v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(m_externalMemoryAllocated); |
| } |
| return m_pattern.get(); |
| } |
| |
| void Pattern::setPatternSpaceTransform(const AffineTransform& patternSpaceTransformation) |
| { |
| m_patternSpaceTransformation = patternSpaceTransformation; |
| if (m_pattern) |
| m_pattern.clear(); |
| } |
| |
| } |