Home | History | Annotate | Download | only in gm 
      1 /*
      2  * Copyright 2015 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 "gm.h"
      9 #include "sk_tool_utils.h"
     10 
     11 #include "SkShader.h"
     12 
     13 // Inspired by svg/as-border-image/svg-as-border-image.html. Draws a four-color checker board bitmap
     14 // such that it is stretched and repeat tiled with different filter qualities. It is testing whether
     15 // the bmp filter respects the repeat mode at the tile seams.
     16 class BmpFilterQualityRepeat : public skiagm::GM {
     17 public:
     18     BmpFilterQualityRepeat() { this->setBGColor(sk_tool_utils::color_to_565(0xFFCCBBAA)); }
     19 
     20 protected:
     21 
     22     void onOnceBeforeDraw() override {
     23         fBmp.allocN32Pixels(40, 40, true);
     24         SkCanvas canvas(fBmp);
     25         SkBitmap colorBmp;
     26         colorBmp.allocN32Pixels(20, 20, true);
     27         colorBmp.eraseColor(0xFFFF0000);
     28         canvas.drawBitmap(colorBmp, 0, 0);
     29         colorBmp.eraseColor(sk_tool_utils::color_to_565(0xFF008200));
     30         canvas.drawBitmap(colorBmp, 20, 0);
     31         colorBmp.eraseColor(sk_tool_utils::color_to_565(0xFFFF9000));
     32         canvas.drawBitmap(colorBmp, 0, 20);
     33         colorBmp.eraseColor(sk_tool_utils::color_to_565(0xFF2000FF));
     34         canvas.drawBitmap(colorBmp, 20, 20);
     35     }
     36 
     37     SkString onShortName() override { return SkString("bmp_filter_quality_repeat"); }
     38 
     39     SkISize onISize() override { return SkISize::Make(1000, 400); }
     40 
     41     void onDraw(SkCanvas* canvas) override {
     42         this->drawAll(canvas, 2.5f);
     43         canvas->translate(0, 250);
     44         canvas->scale(0.5, 0.5);
     45         this->drawAll(canvas, 1);
     46     }
     47 
     48 private:
     49     void drawAll(SkCanvas* canvas, SkScalar scaleX) const {
     50         constexpr struct {
     51             SkFilterQuality fQuality;
     52             const char* fName;
     53         } kQualities[] = {
     54             {kNone_SkFilterQuality, "none"},
     55             {kLow_SkFilterQuality, "low"},
     56             {kMedium_SkFilterQuality, "medium"},
     57             {kHigh_SkFilterQuality, "high"},
     58         };
     59 
     60         SkRect rect = SkRect::MakeLTRB(20, 60, 220, 210);
     61         SkMatrix lm = SkMatrix::I();
     62         lm.setScaleX(scaleX);
     63         lm.setTranslateX(423);
     64         lm.setTranslateY(330);
     65 
     66         SkPaint textPaint;
     67         sk_tool_utils::set_portable_typeface(&textPaint);
     68         textPaint.setAntiAlias(true);
     69 
     70         SkPaint bmpPaint(textPaint);
     71 
     72         SkAutoCanvasRestore acr(canvas, true);
     73 
     74         for (size_t q = 0; q < SK_ARRAY_COUNT(kQualities); ++q) {
     75             constexpr SkShader::TileMode kTM = SkShader::kRepeat_TileMode;
     76             bmpPaint.setShader(SkShader::MakeBitmapShader(fBmp, kTM, kTM, &lm));
     77             bmpPaint.setFilterQuality(kQualities[q].fQuality);
     78             canvas->drawRect(rect, bmpPaint);
     79             canvas->drawText(kQualities[q].fName, strlen(kQualities[q].fName), 20, 40, textPaint);
     80             canvas->translate(250, 0);
     81         }
     82 
     83     }
     84 
     85     SkBitmap    fBmp;
     86 
     87     typedef skiagm::GM INHERITED;
     88 };
     89 
     90 //////////////////////////////////////////////////////////////////////////////
     91 
     92 DEF_GM(return new BmpFilterQualityRepeat;)
     93