Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/Pattern.cpp

-/*
- * 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 "core/platform/graphics/Pattern.h"
-
-#include <v8.h>
-#include "SkCanvas.h"
-#include "SkColorShader.h"
-#include "core/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();
-
-    // 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));
-    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?
-        SkBitmap bm2;
-        bm2.setConfig(m_tileImage->bitmap().config(), m_tileImage->bitmap().width() + expandW, m_tileImage->bitmap().height() + expandH);
-        bm2.allocPixels();
-        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));
-
-        // 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);
-    }
-    m_pattern->setLocalMatrix(affineTransformToSkMatrix(m_patternSpaceTransformation));
-    return m_pattern.get();
-}
-
-void Pattern::setPatternSpaceTransform(const AffineTransform& patternSpaceTransformation)
-{
-    m_patternSpaceTransformation = patternSpaceTransformation;
-    if (m_pattern)
-        m_pattern->setLocalMatrix(affineTransformToSkMatrix(m_patternSpaceTransformation));
-}
-
-}