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// Copyright 2014 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 "config.h"
#include "platform/graphics/BitmapPatternBase.h"
#include "platform/graphics/skia/SkiaUtils.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkShader.h"
namespace blink {
BitmapPatternBase::BitmapPatternBase(RepeatMode repeatMode, int64_t externalMemoryAllocated) : Pattern(repeatMode, externalMemoryAllocated) { }
BitmapPatternBase::~BitmapPatternBase() { }
PassRefPtr<SkShader> BitmapPatternBase::createShader()
{
// 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 = isRepeatX() ? SkShader::kRepeat_TileMode : SkShader::kClamp_TileMode;
SkShader::TileMode tileModeY = isRepeatY() ? SkShader::kRepeat_TileMode : SkShader::kClamp_TileMode;
int expandW = isRepeatX() ? 0 : 1;
int expandH = isRepeatY() ? 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 = this->getBitmapInfo();
// we explicitly require non-opaquness, since we are going to add a transparent strip.
info = SkImageInfo::Make(info.width() + expandW, info.height() + expandH, info.colorType(), kPremul_SkAlphaType);
SkBitmap bm2;
bm2.allocPixels(info);
SkCanvas canvas(bm2);
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
this->drawBitmapToCanvas(canvas, paint);
paint.setARGB(0x00, 0x00, 0x00, 0x00);
paint.setStyle(SkPaint::kFill_Style);
if (!isRepeatX())
canvas.drawRect(SkRect::MakeXYWH(info.width() - 1, 0, 1, info.height()), paint);
if (!isRepeatY())
canvas.drawRect(SkRect::MakeXYWH(0, info.height() - 1, info.width(), 1), paint);
bm2.setImmutable();
adjustExternalMemoryAllocated(bm2.getSafeSize());
SkMatrix localMatrix = affineTransformToSkMatrix(m_patternSpaceTransformation);
return adoptRef(SkShader::CreateBitmapShader(bm2, tileModeX, tileModeY, &localMatrix));
}
} // namespace
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