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      1 
      2 /*
      3  * Copyright 2014 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 
      9 // This test only works with the GPU backend.
     10 
     11 #include "gm.h"
     12 
     13 #if SK_SUPPORT_GPU
     14 
     15 #include "GrContext.h"
     16 #include "GrTest.h"
     17 #include "effects/GrTextureDomain.h"
     18 #include "SkBitmap.h"
     19 #include "SkGr.h"
     20 #include "SkGradientShader.h"
     21 
     22 namespace skiagm {
     23 /**
     24  * This GM directly exercises GrTextureDomainEffect.
     25  */
     26 class TextureDomainEffect : public GM {
     27 public:
     28     TextureDomainEffect() {
     29         this->setBGColor(0xFFFFFFFF);
     30     }
     31 
     32 protected:
     33     virtual SkString onShortName() SK_OVERRIDE {
     34         return SkString("texture_domain_effect");
     35     }
     36 
     37     virtual SkISize onISize() SK_OVERRIDE {
     38         return SkISize::Make(400, 800);
     39     }
     40 
     41     virtual uint32_t onGetFlags() const SK_OVERRIDE {
     42         // This is a GPU-specific GM.
     43         return kGPUOnly_Flag;
     44     }
     45 
     46     virtual void onOnceBeforeDraw() SK_OVERRIDE {
     47         fBmp.allocN32Pixels(100, 100);
     48         SkCanvas canvas(fBmp);
     49         canvas.clear(0x00000000);
     50         SkPaint paint;
     51 
     52         SkColor colors1[] = { SK_ColorCYAN, SK_ColorLTGRAY, SK_ColorGRAY };
     53         paint.setShader(SkGradientShader::CreateSweep(65.f, 75.f, colors1,
     54                                                       NULL, SK_ARRAY_COUNT(colors1)))->unref();
     55         canvas.drawOval(SkRect::MakeXYWH(-5.f, -5.f,
     56                                          fBmp.width() + 10.f, fBmp.height() + 10.f), paint);
     57 
     58         SkColor colors2[] = { SK_ColorMAGENTA, SK_ColorLTGRAY, SK_ColorYELLOW };
     59         paint.setShader(SkGradientShader::CreateSweep(45.f, 55.f, colors2, NULL,
     60                                                       SK_ARRAY_COUNT(colors2)))->unref();
     61         paint.setXfermodeMode(SkXfermode::kDarken_Mode);
     62         canvas.drawOval(SkRect::MakeXYWH(-5.f, -5.f,
     63                                          fBmp.width() + 10.f, fBmp.height() + 10.f), paint);
     64 
     65         SkColor colors3[] = { SK_ColorBLUE, SK_ColorLTGRAY, SK_ColorGREEN };
     66         paint.setShader(SkGradientShader::CreateSweep(25.f, 35.f, colors3, NULL,
     67                                                       SK_ARRAY_COUNT(colors3)))->unref();
     68         paint.setXfermodeMode(SkXfermode::kLighten_Mode);
     69         canvas.drawOval(SkRect::MakeXYWH(-5.f, -5.f,
     70                                          fBmp.width() + 10.f, fBmp.height() + 10.f), paint);
     71     }
     72 
     73     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     74         GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
     75         if (NULL == rt) {
     76             return;
     77         }
     78         GrContext* context = rt->getContext();
     79         if (NULL == context) {
     80             return;
     81         }
     82 
     83         GrTestTarget tt;
     84         context->getTestTarget(&tt);
     85         if (NULL == tt.target()) {
     86             SkDEBUGFAIL("Couldn't get Gr test target.");
     87             return;
     88         }
     89 
     90         GrDrawState* drawState = tt.target()->drawState();
     91 
     92         GrTexture* texture = GrLockAndRefCachedBitmapTexture(context, fBmp, NULL);
     93         if (NULL == texture) {
     94             return;
     95         }
     96 
     97         static const SkScalar kDrawPad = 10.f;
     98         static const SkScalar kTestPad = 10.f;
     99 
    100         SkTArray<SkMatrix> textureMatrices;
    101         textureMatrices.push_back().setIDiv(texture->width(), texture->height());
    102         textureMatrices.push_back() = textureMatrices[0];
    103         textureMatrices.back().postScale(1.5f, 0.85f);
    104         textureMatrices.push_back() = textureMatrices[0];
    105         textureMatrices.back().preRotate(45.f, texture->width() / 2.f, texture->height() / 2.f);
    106 
    107         const SkIRect texelDomains[] = {
    108             SkIRect::MakeWH(fBmp.width(), fBmp.height()),
    109             SkIRect::MakeXYWH(fBmp.width() / 4,
    110                               fBmp.height() / 4,
    111                               fBmp.width() / 2,
    112                               fBmp.height() / 2),
    113         };
    114 
    115         SkRect renderRect = SkRect::MakeWH(SkIntToScalar(fBmp.width()),
    116                                            SkIntToScalar(fBmp.height()));
    117         renderRect.outset(kDrawPad, kDrawPad);
    118 
    119         SkScalar y = kDrawPad + kTestPad;
    120         for (int tm = 0; tm < textureMatrices.count(); ++tm) {
    121             for (size_t d = 0; d < SK_ARRAY_COUNT(texelDomains); ++d) {
    122                 SkScalar x = kDrawPad + kTestPad;
    123                 for (int m = 0; m < GrTextureDomain::kModeCount; ++m) {
    124                     GrTextureDomain::Mode mode = (GrTextureDomain::Mode) m;
    125                     SkAutoTUnref<GrEffectRef> effect(
    126                         GrTextureDomainEffect::Create(texture, textureMatrices[tm],
    127                                                 GrTextureDomain::MakeTexelDomain(texture,
    128                                                                                 texelDomains[d]),
    129                                                 mode, GrTextureParams::kNone_FilterMode));
    130 
    131                     if (!effect) {
    132                         continue;
    133                     }
    134                     SkMatrix viewMatrix;
    135                     viewMatrix.setTranslate(x, y);
    136                     drawState->reset(viewMatrix);
    137                     drawState->setRenderTarget(rt);
    138                     drawState->setColor(0xffffffff);
    139                     drawState->addColorEffect(effect, 1);
    140 
    141                     tt.target()->drawSimpleRect(renderRect);
    142                     x += renderRect.width() + kTestPad;
    143                 }
    144                 y += renderRect.height() + kTestPad;
    145             }
    146         }
    147         GrUnlockAndUnrefCachedBitmapTexture(texture);
    148     }
    149 
    150 private:
    151     SkBitmap fBmp;
    152 
    153     typedef GM INHERITED;
    154 };
    155 
    156 DEF_GM( return SkNEW(TextureDomainEffect); )
    157 }
    158 
    159 #endif
    160