| /* |
| * 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 "SkTileImageFilter.h" |
| #include "SkBitmap.h" |
| #include "SkCanvas.h" |
| #include "SkDevice.h" |
| #include "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| #include "SkMatrix.h" |
| #include "SkPaint.h" |
| #include "SkShader.h" |
| #include "SkValidationUtils.h" |
| |
| SkImageFilter* SkTileImageFilter::Create(const SkRect& srcRect, const SkRect& dstRect, |
| SkImageFilter* input) { |
| if (!SkIsValidRect(srcRect) || !SkIsValidRect(dstRect)) { |
| return nullptr; |
| } |
| return new SkTileImageFilter(srcRect, dstRect, input); |
| } |
| |
| bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, |
| const Context& ctx, |
| SkBitmap* dst, SkIPoint* offset) const { |
| SkBitmap source = src; |
| SkIPoint srcOffset = SkIPoint::Make(0, 0); |
| if (!this->filterInput(0, proxy, src, ctx, &source, &srcOffset)) { |
| return false; |
| } |
| |
| SkRect dstRect; |
| ctx.ctm().mapRect(&dstRect, fDstRect); |
| const SkIRect dstIRect = dstRect.roundOut(); |
| int w = dstIRect.width(); |
| int h = dstIRect.height(); |
| if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) { |
| return false; |
| } |
| |
| SkRect srcRect; |
| ctx.ctm().mapRect(&srcRect, fSrcRect); |
| SkIRect srcIRect; |
| srcRect.roundOut(&srcIRect); |
| srcIRect.offset(-srcOffset); |
| SkBitmap subset; |
| SkIRect bounds; |
| source.getBounds(&bounds); |
| |
| if (!srcIRect.intersect(bounds)) { |
| offset->fX = offset->fY = 0; |
| return true; |
| } else if (!source.extractSubset(&subset, srcIRect)) { |
| return false; |
| } |
| |
| SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h)); |
| if (nullptr == device.get()) { |
| return false; |
| } |
| SkCanvas canvas(device); |
| SkPaint paint; |
| paint.setXfermodeMode(SkXfermode::kSrc_Mode); |
| |
| SkMatrix shaderMatrix; |
| shaderMatrix.setTranslate(SkIntToScalar(srcOffset.fX), |
| SkIntToScalar(srcOffset.fY)); |
| SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset, |
| SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, |
| &shaderMatrix)); |
| paint.setShader(shader); |
| canvas.translate(-dstRect.fLeft, -dstRect.fTop); |
| canvas.drawRect(dstRect, paint); |
| *dst = device->accessBitmap(false); |
| offset->fX = dstIRect.fLeft; |
| offset->fY = dstIRect.fTop; |
| return true; |
| } |
| |
| bool SkTileImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
| SkIRect* dst) const { |
| SkRect srcRect; |
| ctm.mapRect(&srcRect, fSrcRect); |
| SkIRect srcIRect; |
| srcRect.roundOut(&srcIRect); |
| srcIRect.join(src); |
| *dst = srcIRect; |
| return true; |
| } |
| |
| void SkTileImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const { |
| // This is a workaround for skia:3194. |
| *dst = src; |
| dst->join(fDstRect); |
| } |
| |
| SkFlattenable* SkTileImageFilter::CreateProc(SkReadBuffer& buffer) { |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); |
| SkRect src, dst; |
| buffer.readRect(&src); |
| buffer.readRect(&dst); |
| return Create(src, dst, common.getInput(0)); |
| } |
| |
| void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeRect(fSrcRect); |
| buffer.writeRect(fDstRect); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkTileImageFilter::toString(SkString* str) const { |
| str->appendf("SkTileImageFilter: ("); |
| str->appendf("src: %.2f %.2f %.2f %.2f", |
| fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom); |
| str->appendf(" dst: %.2f %.2f %.2f %.2f", |
| fDstRect.fLeft, fDstRect.fTop, fDstRect.fRight, fDstRect.fBottom); |
| if (this->getInput(0)) { |
| str->appendf("input: ("); |
| this->getInput(0)->toString(str); |
| str->appendf(")"); |
| } |
| str->append(")"); |
| } |
| #endif |