Initial picture shader implementation

gm/pictureshader.cpp

+/*
+ * Copyright 2014 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 "SkBitmap.h"
+#include "SkPaint.h"
+#include "SkPicture.h"
+#include "SkShader.h"
+
+namespace skiagm {
+
+class PictureShaderGM : public GM {
+public:
+

[robertphillips, 2014/04/02 18:15:35]

Should we also test some of the other tiling modes?

[f(malita), 2014/04/07 15:06:24]

Done.

+    PictureShaderGM(SkScalar tileSize, SkScalar sceneSize)
+        : fTileSize(tileSize)
+        , fSceneSize(sceneSize) {
+
+        // Build the picture shader.
+        SkAutoTUnref<SkPicture> p(SkNEW(SkPicture));
+        SkCanvas* pictureCanvas = p->beginRecording(SkScalarRoundToInt(tileSize),
+                                                    SkScalarRoundToInt(tileSize));

[robertphillips, 2014/04/02 18:15:35]

this->

[f(malita), 2014/04/07 15:06:24]

Argh, of all the Skia style rules this one never sticks with me :(

Done (all).

+        drawTile(pictureCanvas);
+        p->endRecording();
+        fPictureShader.reset(SkShader::CreatePictureShader(*p,
+                                                           SkShader::kRepeat_TileMode,
+                                                           SkShader::kRepeat_TileMode));
+
+        // Build a reference bitmap shader.
+        SkBitmap bm;
+        bm.allocN32Pixels(SkScalarRoundToInt(tileSize), SkScalarRoundToInt(tileSize));
+        bm.eraseColor(SK_ColorTRANSPARENT);
+        SkCanvas bitmapCanvas(bm);

[robertphillips, 2014/04/02 18:15:35]

this->

+        drawTile(&bitmapCanvas);
+        fBitmapShader.reset(SkShader::CreateBitmapShader(bm,
+                                                         SkShader::kRepeat_TileMode,
+                                                         SkShader::kRepeat_TileMode));
+    }
+
+protected:

[robertphillips, 2014/04/02 18:15:35]

SK_OVERRIDE

[f(malita), 2014/04/07 15:06:24]

Done (all).

+    virtual SkString onShortName() {
+        return SkString("pictureshader");
+    }
+

[robertphillips, 2014/04/02 18:15:35]

SK_OVERRIDE

+    virtual SkISize onISize() {
+        return SkISize::Make(1300, 1100);
+    }
+

[robertphillips, 2014/04/02 18:15:35]

SK_OVERRIDE

+    virtual void onDraw(SkCanvas* canvas) {

[robertphillips, 2014/04/02 18:15:35]

this-> for all of them

+        drawSceneColumn(canvas, 0, 1, 1);
+        drawSceneColumn(canvas, fSceneSize * 2.4f, 1, 2);
+        drawSceneColumn(canvas, fSceneSize * 4.8f, 2, 1);
+        drawSceneColumn(canvas, fSceneSize * 9.6f, 2, 2);
+    }
+
+private:
+    void drawSceneColumn(SkCanvas* canvas, SkScalar xpos, SkScalar scale, SkScalar localScale) {
+        SkMatrix ctm, localMatrix;
+
+        ctm.setTranslate(xpos, 0);
+        ctm.preScale(scale, scale);
+        localMatrix.setScale(localScale, localScale);

[robertphillips, 2014/04/02 18:15:35]

this->

+        drawScene(canvas, ctm, localMatrix);
+
+        ctm.setTranslate(xpos, fSceneSize * 1.2f * scale);
+        ctm.preScale(scale, scale);
+        localMatrix.setTranslate(fTileSize / 4, fTileSize / 4);
+        localMatrix.preScale(localScale, localScale);

[robertphillips, 2014/04/02 18:15:35]

this->

+        drawScene(canvas, ctm, localMatrix);
+
+        ctm.setTranslate(xpos, fSceneSize * 2.4f * scale);
+        ctm.preScale(scale, scale);
+        localMatrix.setRotate(45);
+        localMatrix.preScale(localScale, localScale);

[robertphillips, 2014/04/02 18:15:35]

this->

+        drawScene(canvas, ctm, localMatrix);
+
+        ctm.setTranslate(xpos, fSceneSize * 3.6f * scale);
+        ctm.preScale(scale, scale);
+        localMatrix.setSkew(1, 0);
+        localMatrix.preScale(localScale, localScale);

[robertphillips, 2014/04/02 18:15:35]

this->

+        drawScene(canvas, ctm, localMatrix);
+
+        ctm.setTranslate(xpos, fSceneSize * 4.8f * scale);
+        ctm.preScale(scale, scale);
+        localMatrix.setTranslate(fTileSize / 4, fTileSize / 4);
+        localMatrix.preRotate(45);
+        localMatrix.preScale(localScale, localScale);

[robertphillips, 2014/04/02 18:15:35]

this->

+        drawScene(canvas, ctm, localMatrix);
+    }
+
+    void drawTile(SkCanvas* canvas) {
+        SkPaint paint;
+        paint.setColor(SK_ColorGREEN);
+        paint.setStyle(SkPaint::kFill_Style);
+        paint.setAntiAlias(true);
+
+        canvas->drawCircle(fTileSize / 4, fTileSize / 4, fTileSize / 4, paint);
+        canvas->drawRect(SkRect::MakeXYWH(fTileSize / 2, fTileSize / 2,
+                                          fTileSize / 2, fTileSize / 2), paint);
+
+        paint.setColor(SK_ColorRED);
+        canvas->drawLine(fTileSize / 2, fTileSize * 1 / 3,
+                         fTileSize / 2, fTileSize * 2 / 3, paint);
+        canvas->drawLine(fTileSize * 1 / 3, fTileSize / 2,
+                         fTileSize * 2 / 3, fTileSize / 2, paint);
+    }
+
+    void drawScene(SkCanvas* canvas, const SkMatrix& matrix, const SkMatrix& localMatrix) {
+        SkPaint paint;
+        paint.setStyle(SkPaint::kFill_Style);
+        paint.setColor(SK_ColorLTGRAY);
+
+        canvas->save();
+        canvas->concat(matrix);
+        canvas->drawRect(SkRect::MakeWH(fSceneSize, fSceneSize), paint);
+        canvas->drawRect(SkRect::MakeXYWH(fSceneSize * 1.1f, 0, fSceneSize, fSceneSize), paint);
+
+        fPictureShader->setLocalMatrix(localMatrix);
+        paint.setShader(fPictureShader.get());
+        canvas->drawRect(SkRect::MakeWH(fSceneSize, fSceneSize), paint);
+
+        canvas->translate(fSceneSize * 1.1f, 0);
+
+        fBitmapShader->setLocalMatrix(localMatrix);
+        paint.setShader(fBitmapShader.get());
+        canvas->drawRect(SkRect::MakeWH(fSceneSize, fSceneSize), paint);
+
+        canvas->restore();
+    }
+

[robertphillips, 2014/04/02 18:15:35]

This should go last.

+    typedef GM INHERITED;
+
+    SkScalar    fTileSize;
+    SkScalar    fSceneSize;
+
+    SkAutoTUnref<SkShader> fPictureShader;
+    SkAutoTUnref<SkShader> fBitmapShader;
+};
+

[robertphillips, 2014/04/02 18:15:35]

DEF_GM?

+static GM* MyFactory(void*) { return SkNEW_ARGS(PictureShaderGM, (50, 100)); }
+static GMRegistry reg(MyFactory);
+}