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 19SkTileImageFilter* SkTileImageFilter::Create(const SkRect& srcRect, const SkRect& dstRect, 20 SkImageFilter* input, uint32_t uniqueID) { 21 if (!SkIsValidRect(srcRect) || !SkIsValidRect(dstRect)) { 22 return NULL; 23 } 24 return SkNEW_ARGS(SkTileImageFilter, (srcRect, dstRect, input, uniqueID)); 25} 26 27bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, 28 const Context& ctx, 29 SkBitmap* dst, SkIPoint* offset) const { 30 SkBitmap source = src; 31 SkImageFilter* input = getInput(0); 32 SkIPoint srcOffset = SkIPoint::Make(0, 0); 33 if (input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) { 34 return false; 35 } 36 37 SkRect dstRect; 38 ctx.ctm().mapRect(&dstRect, fDstRect); 39 SkIRect dstIRect; 40 dstRect.roundOut(&dstIRect); 41 int w = dstIRect.width(); 42 int h = dstIRect.height(); 43 if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) { 44 return false; 45 } 46 47 SkRect srcRect; 48 ctx.ctm().mapRect(&srcRect, fSrcRect); 49 SkIRect srcIRect; 50 srcRect.roundOut(&srcIRect); 51 srcIRect.offset(-srcOffset); 52 SkBitmap subset; 53 SkIRect bounds; 54 source.getBounds(&bounds); 55 56 if (!srcIRect.intersect(bounds)) { 57 offset->fX = offset->fY = 0; 58 return true; 59 } else if (!source.extractSubset(&subset, srcIRect)) { 60 return false; 61 } 62 63 SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h)); 64 if (NULL == device.get()) { 65 return false; 66 } 67 SkCanvas canvas(device); 68 SkPaint paint; 69 paint.setXfermodeMode(SkXfermode::kSrc_Mode); 70 71 SkMatrix shaderMatrix; 72 shaderMatrix.setTranslate(SkIntToScalar(srcOffset.fX), 73 SkIntToScalar(srcOffset.fY)); 74 SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset, 75 SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, 76 &shaderMatrix)); 77 paint.setShader(shader); 78 canvas.translate(-dstRect.fLeft, -dstRect.fTop); 79 canvas.drawRect(dstRect, paint); 80 *dst = device->accessBitmap(false); 81 offset->fX = dstIRect.fLeft; 82 offset->fY = dstIRect.fTop; 83 return true; 84} 85 86bool SkTileImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, 87 SkIRect* dst) const { 88 SkRect srcRect; 89 ctm.mapRect(&srcRect, fSrcRect); 90 SkIRect srcIRect; 91 srcRect.roundOut(&srcIRect); 92 srcIRect.join(src); 93 *dst = srcIRect; 94 return true; 95} 96 97#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING 98SkTileImageFilter::SkTileImageFilter(SkReadBuffer& buffer) 99 : INHERITED(1, buffer) { 100 buffer.readRect(&fSrcRect); 101 buffer.readRect(&fDstRect); 102 buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect)); 103} 104#endif 105 106SkFlattenable* SkTileImageFilter::CreateProc(SkReadBuffer& buffer) { 107 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); 108 SkRect src, dst; 109 buffer.readRect(&src); 110 buffer.readRect(&dst); 111 return Create(src, dst, common.getInput(0), common.uniqueID()); 112} 113 114void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const { 115 this->INHERITED::flatten(buffer); 116 buffer.writeRect(fSrcRect); 117 buffer.writeRect(fDstRect); 118} 119