1/* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8#include "SkTileImageFilter.h" 9#include "SkBitmap.h" 10#include "SkCanvas.h" 11#include "SkDevice.h" 12#include "SkReadBuffer.h" 13#include "SkWriteBuffer.h" 14#include "SkMatrix.h" 15#include "SkPaint.h" 16#include "SkShader.h" 17#include "SkValidationUtils.h" 18 19bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, 20 const Context& ctx, 21 SkBitmap* dst, SkIPoint* offset) const { 22 SkBitmap source = src; 23 SkImageFilter* input = getInput(0); 24 SkIPoint srcOffset = SkIPoint::Make(0, 0); 25 if (input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) { 26 return false; 27 } 28 29 SkRect dstRect; 30 ctx.ctm().mapRect(&dstRect, fDstRect); 31 SkIRect dstIRect; 32 dstRect.roundOut(&dstIRect); 33 int w = dstIRect.width(); 34 int h = dstIRect.height(); 35 if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) { 36 return false; 37 } 38 39 SkRect srcRect; 40 ctx.ctm().mapRect(&srcRect, fSrcRect); 41 SkIRect srcIRect; 42 srcRect.roundOut(&srcIRect); 43 srcIRect.offset(-srcOffset); 44 SkBitmap subset; 45 SkIRect bounds; 46 source.getBounds(&bounds); 47 48 if (!srcIRect.intersect(bounds)) { 49 offset->fX = offset->fY = 0; 50 return true; 51 } else if (!source.extractSubset(&subset, srcIRect)) { 52 return false; 53 } 54 55 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h)); 56 if (NULL == device.get()) { 57 return false; 58 } 59 SkCanvas canvas(device); 60 SkPaint paint; 61 paint.setXfermodeMode(SkXfermode::kSrc_Mode); 62 63 SkMatrix shaderMatrix; 64 shaderMatrix.setTranslate(SkIntToScalar(srcOffset.fX), 65 SkIntToScalar(srcOffset.fY)); 66 SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset, 67 SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, 68 &shaderMatrix)); 69 paint.setShader(shader); 70 canvas.translate(-dstRect.fLeft, -dstRect.fTop); 71 canvas.drawRect(dstRect, paint); 72 *dst = device->accessBitmap(false); 73 offset->fX = dstIRect.fLeft; 74 offset->fY = dstIRect.fTop; 75 return true; 76} 77 78bool SkTileImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, 79 SkIRect* dst) const { 80 SkRect srcRect; 81 ctm.mapRect(&srcRect, fSrcRect); 82 SkIRect srcIRect; 83 srcRect.roundOut(&srcIRect); 84 srcIRect.join(src); 85 *dst = srcIRect; 86 return true; 87} 88 89SkTileImageFilter::SkTileImageFilter(SkReadBuffer& buffer) 90 : INHERITED(1, buffer) { 91 buffer.readRect(&fSrcRect); 92 buffer.readRect(&fDstRect); 93 buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect)); 94} 95 96void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const { 97 this->INHERITED::flatten(buffer); 98 buffer.writeRect(fSrcRect); 99 buffer.writeRect(fDstRect); 100} 101