| /* |
| * 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" |
| |
| bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, const SkImageFilter::Context& ctx, |
| SkBitmap* dst, SkIPoint* offset) const { |
| SkBitmap source = src; |
| SkImageFilter* input = getInput(0); |
| SkIPoint srcOffset = SkIPoint::Make(0, 0); |
| if (input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) { |
| return false; |
| } |
| |
| SkRect dstRect; |
| ctx.ctm().mapRect(&dstRect, fDstRect); |
| SkIRect dstIRect; |
| dstRect.roundOut(&dstIRect); |
| 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 (NULL == device.get()) { |
| return false; |
| } |
| SkCanvas canvas(device); |
| SkPaint paint; |
| paint.setXfermodeMode(SkXfermode::kSrc_Mode); |
| |
| SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset, |
| SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode)); |
| SkMatrix shaderMatrix; |
| shaderMatrix.setTranslate(SkIntToScalar(srcOffset.fX), |
| SkIntToScalar(srcOffset.fY)); |
| shader->setLocalMatrix(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; |
| } |
| |
| SkTileImageFilter::SkTileImageFilter(SkReadBuffer& buffer) |
| : INHERITED(1, buffer) { |
| buffer.readRect(&fSrcRect); |
| buffer.readRect(&fDstRect); |
| buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect)); |
| } |
| |
| void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeRect(fSrcRect); |
| buffer.writeRect(fDstRect); |
| } |