texdata.cpp revision 78d6cf9f434d3351b19de14f1eab424c23f0ab6d
1 2/* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8#include "gm.h" 9#include "GrContext.h" 10#include "SkColorPriv.h" 11#include "SkDevice.h" 12 13namespace skiagm { 14 15extern GrContext* GetGr(); 16 17static const int S = 200; 18 19class TexDataGM : public GM { 20public: 21 TexDataGM() { 22 this->setBGColor(0xff000000); 23 } 24 25protected: 26 virtual SkString onShortName() { 27 return SkString("texdata"); 28 } 29 30 virtual SkISize onISize() { 31 return make_isize(2*S, 2*S); 32 } 33 34 virtual void onDraw(SkCanvas* canvas) { 35 SkDevice* device = canvas->getDevice(); 36 GrRenderTarget* target = (GrRenderTarget*) device->accessRenderTarget(); 37 GrContext* ctx = GetGr(); 38 if (ctx && target) { 39 SkPMColor gTextureData[(2 * S) * (2 * S)]; 40 static const int stride = 2 * S; 41 static const SkPMColor gray = SkPackARGB32(0x40, 0x40, 0x40, 0x40); 42 static const SkPMColor white = SkPackARGB32(0xff, 0xff, 0xff, 0xff); 43 static const SkPMColor red = SkPackARGB32(0x80, 0x80, 0x00, 0x00); 44 static const SkPMColor blue = SkPackARGB32(0x80, 0x00, 0x00, 0x80); 45 static const SkPMColor green = SkPackARGB32(0x80, 0x00, 0x80, 0x00); 46 static const SkPMColor black = SkPackARGB32(0x00, 0x00, 0x00, 0x00); 47 for (int i = 0; i < 2; ++i) { 48 int offset = 0; 49 // fill upper-left 50 for (int y = 0; y < S; ++y) { 51 for (int x = 0; x < S; ++x) { 52 gTextureData[offset + y * stride + x] = gray; 53 } 54 } 55 // fill upper-right 56 offset = S; 57 for (int y = 0; y < S; ++y) { 58 for (int x = 0; x < S; ++x) { 59 gTextureData[offset + y * stride + x] = white; 60 } 61 } 62 // fill lower left 63 offset = S * stride; 64 for (int y = 0; y < S; ++y) { 65 for (int x = 0; x < S; ++x) { 66 gTextureData[offset + y * stride + x] = black; 67 } 68 } 69 // fill lower right 70 offset = S * stride + S; 71 for (int y = 0; y < S; ++y) { 72 for (int x = 0; x < S; ++x) { 73 gTextureData[offset + y * stride + x] = gray; 74 } 75 } 76 77 GrTextureDesc desc; 78 // use RT flag bit because in GL it makes the texture be bottom-up 79 desc.fFlags = i ? kRenderTarget_GrTextureFlagBit : 80 kNone_GrTextureFlags; 81 desc.fConfig = kSkia8888_PM_GrPixelConfig; 82 desc.fWidth = 2 * S; 83 desc.fHeight = 2 * S; 84 desc.fSampleCnt = 0; 85 GrTexture* texture = 86 ctx->createUncachedTexture(desc, gTextureData, 0); 87 88 if (!texture) { 89 return; 90 } 91 GrAutoUnref au(texture); 92 93 ctx->setClip(GrRect::MakeWH(2*S, 2*S)); 94 ctx->setRenderTarget(target); 95 96 GrPaint paint; 97 paint.reset(); 98 paint.fColor = 0xffffffff; 99 paint.fSrcBlendCoeff = kOne_BlendCoeff; 100 paint.fDstBlendCoeff = kISA_BlendCoeff; 101 GrMatrix vm; 102 if (i) { 103 vm.setRotate(90 * SK_Scalar1, 104 S * SK_Scalar1, 105 S * SK_Scalar1); 106 } else { 107 vm.reset(); 108 } 109 ctx->setMatrix(vm); 110 GrMatrix tm; 111 tm = vm; 112 GrMatrix* sampleMat = paint.textureSampler(0)->matrix(); 113 *sampleMat = vm; 114 sampleMat->postIDiv(2*S, 2*S); 115 paint.setTexture(0, texture); 116 117 ctx->drawRect(paint, GrRect::MakeWH(2*S, 2*S)); 118 119 // now update the lower right of the texture in first pass 120 // or upper right in second pass 121 offset = 0; 122 for (int y = 0; y < S; ++y) { 123 for (int x = 0; x < S; ++x) { 124 gTextureData[offset + y * stride + x] = 125 ((x + y) % 2) ? (i ? green : red) : blue; 126 } 127 } 128 texture->writePixels(S, (i ? 0 : S), S, S, 129 texture->config(), gTextureData, 130 4 * stride); 131 ctx->drawRect(paint, GrRect::MakeWH(2*S, 2*S)); 132 } 133 } 134 } 135 136private: 137 typedef GM INHERITED; 138}; 139 140////////////////////////////////////////////////////////////////////////////// 141 142static GM* MyFactory(void*) { return new TexDataGM; } 143static GMRegistry reg(MyFactory); 144 145} 146 147