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// Copyright (c) 2012 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 "ui/gfx/skia_util.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkColorFilter.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "third_party/skia/include/core/SkUnPreMultiply.h"
#include "third_party/skia/include/effects/SkBlurMaskFilter.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
#include "third_party/skia/include/effects/SkLayerDrawLooper.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "ui/gfx/shadow_value.h"
#include "ui/gfx/transform.h"
namespace gfx {
SkRect RectToSkRect(const Rect& rect) {
SkRect r;
r.iset(rect.x(), rect.y(), rect.right(), rect.bottom());
return r;
}
SkIRect RectToSkIRect(const Rect& rect) {
return SkIRect::MakeXYWH(rect.x(), rect.y(), rect.width(), rect.height());
}
Rect SkIRectToRect(const SkIRect& rect) {
return Rect(rect.x(), rect.y(), rect.width(), rect.height());
}
SkRect RectFToSkRect(const RectF& rect) {
return SkRect::MakeXYWH(SkFloatToScalar(rect.x()),
SkFloatToScalar(rect.y()),
SkFloatToScalar(rect.width()),
SkFloatToScalar(rect.height()));
}
RectF SkRectToRectF(const SkRect& rect) {
return RectF(SkScalarToFloat(rect.x()),
SkScalarToFloat(rect.y()),
SkScalarToFloat(rect.width()),
SkScalarToFloat(rect.height()));
}
void TransformToFlattenedSkMatrix(const gfx::Transform& transform,
SkMatrix* flattened) {
// Convert from 4x4 to 3x3 by dropping the third row and column.
flattened->set(0, SkMScalarToScalar(transform.matrix().get(0, 0)));
flattened->set(1, SkMScalarToScalar(transform.matrix().get(0, 1)));
flattened->set(2, SkMScalarToScalar(transform.matrix().get(0, 3)));
flattened->set(3, SkMScalarToScalar(transform.matrix().get(1, 0)));
flattened->set(4, SkMScalarToScalar(transform.matrix().get(1, 1)));
flattened->set(5, SkMScalarToScalar(transform.matrix().get(1, 3)));
flattened->set(6, SkMScalarToScalar(transform.matrix().get(3, 0)));
flattened->set(7, SkMScalarToScalar(transform.matrix().get(3, 1)));
flattened->set(8, SkMScalarToScalar(transform.matrix().get(3, 3)));
}
skia::RefPtr<SkShader> CreateImageRepShader(const gfx::ImageSkiaRep& image_rep,
SkShader::TileMode tile_mode,
const SkMatrix& local_matrix) {
return CreateImageRepShaderForScale(image_rep, tile_mode, local_matrix,
image_rep.scale());
}
skia::RefPtr<SkShader> CreateImageRepShaderForScale(
const gfx::ImageSkiaRep& image_rep,
SkShader::TileMode tile_mode,
const SkMatrix& local_matrix,
SkScalar scale) {
// Unscale matrix by |scale| such that the bitmap is drawn at the
// correct density.
// Convert skew and translation to pixel coordinates.
// Thus, for |bitmap_scale| = 2:
// x scale = 2, x translation = 1 DIP,
// should be converted to
// x scale = 1, x translation = 2 pixels.
SkMatrix shader_scale = local_matrix;
shader_scale.preScale(scale, scale);
shader_scale.setScaleX(local_matrix.getScaleX() / scale);
shader_scale.setScaleY(local_matrix.getScaleY() / scale);
skia::RefPtr<SkShader> shader = skia::AdoptRef(SkShader::CreateBitmapShader(
image_rep.sk_bitmap(), tile_mode, tile_mode, &shader_scale));
return shader;
}
skia::RefPtr<SkShader> CreateGradientShader(int start_point,
int end_point,
SkColor start_color,
SkColor end_color) {
SkColor grad_colors[2] = { start_color, end_color};
SkPoint grad_points[2];
grad_points[0].iset(0, start_point);
grad_points[1].iset(0, end_point);
return skia::AdoptRef(SkGradientShader::CreateLinear(
grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode));
}
static SkScalar RadiusToSigma(double radius) {
// This captures historically what skia did under the hood. Now skia accepts
// sigma, not radius, so we perform the conversion.
return radius > 0 ? SkDoubleToScalar(0.57735f * radius + 0.5) : 0;
}
skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper(
const std::vector<ShadowValue>& shadows) {
if (shadows.empty())
return skia::RefPtr<SkDrawLooper>();
SkLayerDrawLooper::Builder looper_builder;
looper_builder.addLayer(); // top layer of the original.
SkLayerDrawLooper::LayerInfo layer_info;
layer_info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit;
layer_info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
layer_info.fColorMode = SkXfermode::kSrc_Mode;
for (size_t i = 0; i < shadows.size(); ++i) {
const ShadowValue& shadow = shadows[i];
layer_info.fOffset.set(SkIntToScalar(shadow.x()),
SkIntToScalar(shadow.y()));
// SkBlurMaskFilter's blur radius defines the range to extend the blur from
// original mask, which is half of blur amount as defined in ShadowValue.
skia::RefPtr<SkMaskFilter> blur_mask = skia::AdoptRef(
SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
RadiusToSigma(shadow.blur() / 2),
SkBlurMaskFilter::kHighQuality_BlurFlag));
skia::RefPtr<SkColorFilter> color_filter = skia::AdoptRef(
SkColorFilter::CreateModeFilter(shadow.color(),
SkXfermode::kSrcIn_Mode));
SkPaint* paint = looper_builder.addLayer(layer_info);
paint->setMaskFilter(blur_mask.get());
paint->setColorFilter(color_filter.get());
}
return skia::AdoptRef<SkDrawLooper>(looper_builder.detachLooper());
}
bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2) {
void* addr1 = NULL;
void* addr2 = NULL;
size_t size1 = 0;
size_t size2 = 0;
bitmap1.lockPixels();
addr1 = bitmap1.getAddr32(0, 0);
size1 = bitmap1.getSize();
bitmap1.unlockPixels();
bitmap2.lockPixels();
addr2 = bitmap2.getAddr32(0, 0);
size2 = bitmap2.getSize();
bitmap2.unlockPixels();
return (size1 == size2) && (0 == memcmp(addr1, addr2, bitmap1.getSize()));
}
void ConvertSkiaToRGBA(const unsigned char* skia,
int pixel_width,
unsigned char* rgba) {
int total_length = pixel_width * 4;
for (int i = 0; i < total_length; i += 4) {
const uint32_t pixel_in = *reinterpret_cast<const uint32_t*>(&skia[i]);
// Pack the components here.
SkAlpha alpha = SkGetPackedA32(pixel_in);
if (alpha != 0 && alpha != 255) {
SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(pixel_in);
rgba[i + 0] = SkColorGetR(unmultiplied);
rgba[i + 1] = SkColorGetG(unmultiplied);
rgba[i + 2] = SkColorGetB(unmultiplied);
rgba[i + 3] = alpha;
} else {
rgba[i + 0] = SkGetPackedR32(pixel_in);
rgba[i + 1] = SkGetPackedG32(pixel_in);
rgba[i + 2] = SkGetPackedB32(pixel_in);
rgba[i + 3] = alpha;
}
}
}
} // namespace gfx
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