| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkDropShadowImageFilter.h" |
| |
| #include "SkBitmap.h" |
| #include "SkBlurImageFilter.h" |
| #include "SkCanvas.h" |
| #include "SkColorMatrixFilter.h" |
| #include "SkDevice.h" |
| #include "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| |
| SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigma, SkColor color, SkImageFilter* input) |
| : INHERITED(input) |
| , fDx(dx) |
| , fDy(dy) |
| , fSigmaX(sigma) |
| , fSigmaY(sigma) |
| , fColor(color) |
| { |
| } |
| |
| SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor color, SkImageFilter* input, const CropRect* cropRect) |
| : INHERITED(input, cropRect) |
| , fDx(dx) |
| , fDy(dy) |
| , fSigmaX(sigmaX) |
| , fSigmaY(sigmaY) |
| , fColor(color) |
| { |
| } |
| |
| SkDropShadowImageFilter::SkDropShadowImageFilter(SkReadBuffer& buffer) |
| : INHERITED(1, buffer) { |
| fDx = buffer.readScalar(); |
| fDy = buffer.readScalar(); |
| fSigmaX = buffer.readScalar(); |
| fSigmaY = buffer.readScalar(); |
| fColor = buffer.readColor(); |
| buffer.validate(SkScalarIsFinite(fDx) && |
| SkScalarIsFinite(fDy) && |
| SkScalarIsFinite(fSigmaX) && |
| SkScalarIsFinite(fSigmaY)); |
| } |
| |
| void SkDropShadowImageFilter::flatten(SkWriteBuffer& buffer) const |
| { |
| this->INHERITED::flatten(buffer); |
| buffer.writeScalar(fDx); |
| buffer.writeScalar(fDy); |
| buffer.writeScalar(fSigmaX); |
| buffer.writeScalar(fSigmaY); |
| buffer.writeColor(fColor); |
| } |
| |
| bool SkDropShadowImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source, const Context& ctx, SkBitmap* result, SkIPoint* offset) const |
| { |
| SkBitmap src = source; |
| SkIPoint srcOffset = SkIPoint::Make(0, 0); |
| if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) |
| return false; |
| |
| SkIRect bounds; |
| if (!this->applyCropRect(ctx, src, srcOffset, &bounds)) { |
| return false; |
| } |
| |
| SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height())); |
| if (NULL == device.get()) { |
| return false; |
| } |
| SkCanvas canvas(device.get()); |
| |
| SkVector sigma, localSigma = SkVector::Make(fSigmaX, fSigmaY); |
| ctx.ctm().mapVectors(&sigma, &localSigma, 1); |
| sigma.fX = SkMaxScalar(0, sigma.fX); |
| sigma.fY = SkMaxScalar(0, sigma.fY); |
| SkAutoTUnref<SkImageFilter> blurFilter(SkBlurImageFilter::Create(sigma.fX, sigma.fY)); |
| SkAutoTUnref<SkColorFilter> colorFilter(SkColorFilter::CreateModeFilter(fColor, SkXfermode::kSrcIn_Mode)); |
| SkPaint paint; |
| paint.setImageFilter(blurFilter.get()); |
| paint.setColorFilter(colorFilter.get()); |
| paint.setXfermodeMode(SkXfermode::kSrcOver_Mode); |
| SkVector offsetVec, localOffsetVec = SkVector::Make(fDx, fDy); |
| ctx.ctm().mapVectors(&offsetVec, &localOffsetVec, 1); |
| canvas.translate(SkIntToScalar(srcOffset.fX - bounds.fLeft), |
| SkIntToScalar(srcOffset.fY - bounds.fTop)); |
| canvas.drawBitmap(src, offsetVec.fX, offsetVec.fY, &paint); |
| canvas.drawBitmap(src, 0, 0); |
| *result = device->accessBitmap(false); |
| offset->fX = bounds.fLeft; |
| offset->fY = bounds.fTop; |
| return true; |
| } |
| |
| void SkDropShadowImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const { |
| if (getInput(0)) { |
| getInput(0)->computeFastBounds(src, dst); |
| } else { |
| *dst = src; |
| } |
| |
| SkRect shadowBounds = *dst; |
| shadowBounds.offset(fDx, fDy); |
| shadowBounds.outset(SkScalarMul(fSigmaX, SkIntToScalar(3)), |
| SkScalarMul(fSigmaY, SkIntToScalar(3))); |
| dst->join(shadowBounds); |
| } |
| |
| bool SkDropShadowImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
| SkIRect* dst) const { |
| SkIRect bounds = src; |
| if (getInput(0) && !getInput(0)->filterBounds(src, ctm, &bounds)) { |
| return false; |
| } |
| SkVector offsetVec, localOffsetVec = SkVector::Make(fDx, fDy); |
| ctm.mapVectors(&offsetVec, &localOffsetVec, 1); |
| bounds.offset(-SkScalarCeilToInt(offsetVec.x()), |
| -SkScalarCeilToInt(offsetVec.y())); |
| SkVector sigma, localSigma = SkVector::Make(fSigmaX, fSigmaY); |
| ctm.mapVectors(&sigma, &localSigma, 1); |
| bounds.outset(SkScalarCeilToInt(SkScalarMul(sigma.x(), SkIntToScalar(3))), |
| SkScalarCeilToInt(SkScalarMul(sigma.y(), SkIntToScalar(3)))); |
| bounds.join(src); |
| *dst = bounds; |
| return true; |
| } |