Update bleed GM to contain HQ filtering test cases

gm/bleed.cpp

 /*
  * 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 "gm.h"
 #include "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
 #include "SkCanvas.h"
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #endif
 
-// Create a black&white checked texture with a 1-pixel red ring
-// around the outside edge
-static void make_red_ringed_bitmap(SkBitmap* result, int width, int height) {
-    SkASSERT(0 == width % 2 && 0 == width % 2);
+// Create a black&white checked texture with 2 1-pixel rings
+// around the outside edge. The inner ring is red and the outer ring is blue.
+static void make_ringed_bitmap(SkBitmap* result, int width, int height) {
+    SkASSERT(0 == width % 2 && 0 == height % 2);
+    
+    static const SkPMColor kRed = SkPreMultiplyColor(SK_ColorRED);
+    static const SkPMColor kBlue = SkPreMultiplyColor(SK_ColorBLUE);
+    static const SkPMColor kBlack = SkPreMultiplyColor(SK_ColorBLACK);
+    static const SkPMColor kWhite = SkPreMultiplyColor(SK_ColorWHITE);
 
     result->setConfig(SkBitmap::kARGB_8888_Config, width, height, 0,
                       kOpaque_SkAlphaType);
     result->allocPixels();
     SkAutoLockPixels lock(*result);
 
     SkPMColor* scanline = result->getAddr32(0, 0);
     for (int x = 0; x < width; ++x) {
-        scanline[x] = SK_ColorRED;
+        scanline[x] = kBlue;
+    }
+    scanline = result->getAddr32(0, 1);
+    scanline[0] = kBlue;
+    for (int x = 1; x < width - 1; ++x) {
+        scanline[x] = kRed;
+    }
+    scanline[width-1] = kBlue;
+
+    for (int y = 2; y < height/2; ++y) {
+        scanline = result->getAddr32(0, y);
+        scanline[0] = kBlue;
+        scanline[1] = kRed;
+        for (int x = 2; x < width/2; ++x) {
+            scanline[x] = kBlack;
+        }
+        for (int x = width/2; x < width-2; ++x) {
+            scanline[x] = kWhite;
+        }
+        scanline[width-2] = kRed;
+        scanline[width-1] = kBlue;
     }
 
-    for (int y = 1; y < height/2; ++y) {
+    for (int y = height/2; y < height-2; ++y) {
         scanline = result->getAddr32(0, y);
-        scanline[0] = SK_ColorRED;
-        for (int x = 1; x < width/2; ++x) {
-            scanline[x] = SK_ColorBLACK;
+        scanline[0] = kBlue;
+        scanline[1] = kRed;
+        for (int x = 2; x < width/2; ++x) {
+            scanline[x] = kWhite;
         }
-        for (int x = width/2; x < width-1; ++x) {
-            scanline[x] = SK_ColorWHITE;
+        for (int x = width/2; x < width-2; ++x) {
+            scanline[x] = kBlack;
         }
-        scanline[width-1] = SK_ColorRED;
+        scanline[width-2] = kRed;
+        scanline[width-1] = kBlue;
     }
 
-    for (int y = height/2; y < height-1; ++y) {
-        scanline = result->getAddr32(0, y);
-        scanline[0] = SK_ColorRED;
-        for (int x = 1; x < width/2; ++x) {
-            scanline[x] = SK_ColorWHITE;
-        }
-        for (int x = width/2; x < width-1; ++x) {
-            scanline[x] = SK_ColorBLACK;
-        }
-        scanline[width-1] = SK_ColorRED;
+    scanline = result->getAddr32(0, height-2);
+    scanline[0] = kBlue;
+    for (int x = 1; x < width - 1; ++x) {
+        scanline[x] = kRed;
     }
+    scanline[width-1] = kBlue;
 
     scanline = result->getAddr32(0, height-1);
     for (int x = 0; x < width; ++x) {
-        scanline[x] = SK_ColorRED;
+        scanline[x] = kBlue;
     }
     result->setImmutable();
 }
 
 // This GM exercises the drawBitmapRectToRect "bleed" flag
 class BleedGM : public skiagm::GM {
 public:
     BleedGM() {}
 
 protected:
     virtual SkString onShortName() SK_OVERRIDE {
         return SkString("bleed");
     }
 
     virtual SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(kWidth, kHeight);
     }
 
     virtual void onOnceBeforeDraw() SK_OVERRIDE {
-        make_red_ringed_bitmap(&fBitmapSmall, kSmallTextureSize, kSmallTextureSize);
+        make_ringed_bitmap(&fBitmapSmall, kSmallTextureSize, kSmallTextureSize);
 
         // To exercise the GPU's tiling path we need a texture
         // too big for the GPU to handle in one go
-        make_red_ringed_bitmap(&fBitmapBig, 2*kMaxTextureSize, 2*kMaxTextureSize);
+        make_ringed_bitmap(&fBitmapBig, 2*kMaxTextureSize, 2*kMaxTextureSize);
     }
 
     // Draw only the center of the small bitmap
     void drawCase1(SkCanvas* canvas, int transX, int transY,
-                   SkCanvas::DrawBitmapRectFlags flags, bool filter) {
-        SkRect src = SkRect::MakeXYWH(1, 1,
-                                      kSmallTextureSize-2,
-                                      kSmallTextureSize-2);
+                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
+        SkRect src = SkRect::MakeXYWH(2, 2,
+                                      kSmallTextureSize-4,
+                                      kSmallTextureSize-4);
         SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
 
         SkPaint paint;
-        paint.setFilterLevel(filter ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
+        paint.setFilterLevel(filter);
 
         canvas->save();
         canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
         canvas->drawBitmapRectToRect(fBitmapSmall, &src, dst, &paint, flags);
         canvas->restore();
     }
 
     // Draw almost all of the large bitmap
     void drawCase2(SkCanvas* canvas, int transX, int transY,
-                   SkCanvas::DrawBitmapRectFlags flags, bool filter) {
-        SkRect src = SkRect::MakeXYWH(1, 1,
-                                      SkIntToScalar(fBitmapBig.width()-2),
-                                      SkIntToScalar(fBitmapBig.height()-2));
+                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
+        SkRect src = SkRect::MakeXYWH(2, 2,
+                                      SkIntToScalar(fBitmapBig.width()-4),
+                                      SkIntToScalar(fBitmapBig.height()-4));
         SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
 
         SkPaint paint;
-        paint.setFilterLevel(filter ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
+        paint.setFilterLevel(filter);
 
         canvas->save();
         canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
         canvas->drawBitmapRectToRect(fBitmapBig, &src, dst, &paint, flags);
         canvas->restore();
     }
 
     // Draw ~1/4 of the large bitmap
     void drawCase3(SkCanvas* canvas, int transX, int transY,
-                   SkCanvas::DrawBitmapRectFlags flags, bool filter) {
-        SkRect src = SkRect::MakeXYWH(1, 1,
-                                      SkIntToScalar(fBitmapBig.width()/2-1),
-                                      SkIntToScalar(fBitmapBig.height()/2-1));
+                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
+        SkRect src = SkRect::MakeXYWH(2, 2,
+                                      SkIntToScalar(fBitmapBig.width()/2-2),
+                                      SkIntToScalar(fBitmapBig.height()/2-2));
         SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
 
         SkPaint paint;
-        paint.setFilterLevel(filter ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
+        paint.setFilterLevel(filter);
 
         canvas->save();
         canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
         canvas->drawBitmapRectToRect(fBitmapBig, &src, dst, &paint, flags);
         canvas->restore();
     }
 
     // Draw the center of the small bitmap with a mask filter
     void drawCase4(SkCanvas* canvas, int transX, int transY,
-                   SkCanvas::DrawBitmapRectFlags flags, bool filter) {
-        SkRect src = SkRect::MakeXYWH(1, 1,
-                                      kSmallTextureSize-2,
-                                      kSmallTextureSize-2);
+                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
+        SkRect src = SkRect::MakeXYWH(2, 2,
+                                      kSmallTextureSize-4,
+                                      kSmallTextureSize-4);
         SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
 
         SkPaint paint;
-        paint.setFilterLevel(filter ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
+        paint.setFilterLevel(filter);
         SkMaskFilter* mf = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
                                          SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3)));
         paint.setMaskFilter(mf)->unref();
 
         canvas->save();
         canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
         canvas->drawBitmapRectToRect(fBitmapSmall, &src, dst, &paint, flags);
         canvas->restore();
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
 
         canvas->clear(SK_ColorGRAY);
 
+        // Currently there are no test cases with medium filtering since medium uses mip-mapping and
+        // these draws are always upscaling.
+        
         // First draw a column with no bleeding, tiling, or filtering
-        this->drawCase1(canvas, kCol0X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, false);
-        this->drawCase2(canvas, kCol0X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, false);
-        this->drawCase3(canvas, kCol0X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, false);
-        this->drawCase4(canvas, kCol0X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, false);
+        this->drawCase1(canvas, kCol0X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
+        this->drawCase2(canvas, kCol0X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
+        this->drawCase3(canvas, kCol0X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
+        this->drawCase4(canvas, kCol0X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
 
-        // Then draw a column with no bleeding or tiling but with filtering
-        this->drawCase1(canvas, kCol1X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, true);
-        this->drawCase2(canvas, kCol1X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, true);
-        this->drawCase3(canvas, kCol1X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, true);
-        this->drawCase4(canvas, kCol1X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, true);
+        // Then draw a column with no bleeding or tiling but with low filtering
+        this->drawCase1(canvas, kCol1X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        this->drawCase2(canvas, kCol1X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        this->drawCase3(canvas, kCol1X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        this->drawCase4(canvas, kCol1X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
 
-
+        // Then draw a column with no bleeding or tiling but with high filtering
+        this->drawCase1(canvas, kCol2X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        this->drawCase2(canvas, kCol2X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        this->drawCase3(canvas, kCol2X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        this->drawCase4(canvas, kCol2X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        
 #if SK_SUPPORT_GPU
         GrContext* ctx = GM::GetGr(canvas);
         int oldMaxTextureSize = 0;
         if (NULL != ctx) {
             // shrink the max texture size so all our textures can be reasonably sized
             oldMaxTextureSize = ctx->getMaxTextureSize();
             ctx->setMaxTextureSizeOverride(kMaxTextureSize);
         }
 #endif
 
-        // Then draw a column with no bleeding but with tiling and filtering
-        this->drawCase1(canvas, kCol2X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, true);
-        this->drawCase2(canvas, kCol2X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, true);
-        this->drawCase3(canvas, kCol2X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, true);
-        this->drawCase4(canvas, kCol2X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, true);
+        // Then draw a column with no bleeding but with tiling and low filtering
+        this->drawCase1(canvas, kCol3X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        this->drawCase2(canvas, kCol3X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        this->drawCase3(canvas, kCol3X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        this->drawCase4(canvas, kCol3X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
 
-        // Finally draw a column with all three (bleeding, tiling, and filtering)
-        this->drawCase1(canvas, kCol3X, kRow0Y, SkCanvas::kBleed_DrawBitmapRectFlag, true);
-        this->drawCase2(canvas, kCol3X, kRow1Y, SkCanvas::kBleed_DrawBitmapRectFlag, true);
-        this->drawCase3(canvas, kCol3X, kRow2Y, SkCanvas::kBleed_DrawBitmapRectFlag, true);
-        this->drawCase4(canvas, kCol3X, kRow3Y, SkCanvas::kBleed_DrawBitmapRectFlag, true);
+        // Then draw a column with no bleeding but with tiling and high filtering
+        this->drawCase1(canvas, kCol4X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        this->drawCase2(canvas, kCol4X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        this->drawCase3(canvas, kCol4X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        this->drawCase4(canvas, kCol4X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        
+        // Then draw a column with bleeding, tiling, and low filtering
+        this->drawCase1(canvas, kCol5X, kRow0Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        this->drawCase2(canvas, kCol5X, kRow1Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        this->drawCase3(canvas, kCol5X, kRow2Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        this->drawCase4(canvas, kCol5X, kRow3Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
+        
+        // Finally draw a column with bleeding, tiling, and high filtering
+        this->drawCase1(canvas, kCol6X, kRow0Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        this->drawCase2(canvas, kCol6X, kRow1Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        this->drawCase3(canvas, kCol6X, kRow2Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
+        this->drawCase4(canvas, kCol6X, kRow3Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
 
 #if SK_SUPPORT_GPU
         if (NULL != ctx) {
             ctx->setMaxTextureSizeOverride(oldMaxTextureSize);
         }
 #endif
     }
 
 private:
-    static const int kBlockSize = 90;
-    static const int kBlockSpacing = 10;
+    static const int kBlockSize = 70;
+    static const int kBlockSpacing = 5;
 
     static const int kCol0X = kBlockSpacing;
     static const int kCol1X = 2*kBlockSpacing + kBlockSize;
     static const int kCol2X = 3*kBlockSpacing + 2*kBlockSize;
     static const int kCol3X = 4*kBlockSpacing + 3*kBlockSize;
-    static const int kWidth = 5*kBlockSpacing + 4*kBlockSize;
+    static const int kCol4X = 5*kBlockSpacing + 4*kBlockSize;
+    static const int kCol5X = 6*kBlockSpacing + 5*kBlockSize;
+    static const int kCol6X = 7*kBlockSpacing + 6*kBlockSize;
+    static const int kWidth = 8*kBlockSpacing + 7*kBlockSize;
 
     static const int kRow0Y = kBlockSpacing;
     static const int kRow1Y = 2*kBlockSpacing + kBlockSize;
     static const int kRow2Y = 3*kBlockSpacing + 2*kBlockSize;
     static const int kRow3Y = 4*kBlockSpacing + 3*kBlockSize;
     static const int kHeight = 5*kBlockSpacing + 4*kBlockSize;
 
-    static const int kSmallTextureSize = 4;
+    static const int kSmallTextureSize = 6;
     static const int kMaxTextureSize = 32;
 
     SkBitmap fBitmapSmall;
     SkBitmap fBitmapBig;
 
     typedef GM INHERITED;
 };
 
 DEF_GM( return new BleedGM(); )