Add new GM (filterfastbounds)
This new GM visualizes the fast bounds computed by various image-filter-based SkPaints. This is lead up to fixing some issues in fast bound computation.
BUG=418417
Review URL: https://codereview.chromium.org/788613003
diff --git a/gm/filterfastbounds.cpp b/gm/filterfastbounds.cpp
new file mode 100644
index 0000000..6d4d3f1
--- /dev/null
+++ b/gm/filterfastbounds.cpp
@@ -0,0 +1,336 @@
+/*
+ * 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 "SkBitmapSource.h"
+#include "SkBlurImageFilter.h"
+#include "SkDropShadowImageFilter.h"
+#include "SkMatrixImageFilter.h"
+#include "SkOffsetImageFilter.h"
+#include "SkPictureImageFilter.h"
+#include "SkPictureRecorder.h"
+#include "SkRandom.h"
+
+namespace skiagm {
+
+// Each method of this type must draw its geometry inside 'r' using 'p'
+typedef void(*drawMth)(SkCanvas* canvas, const SkRect& r, const SkPaint& p);
+
+static void draw_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
+ canvas->drawRect(r, p);
+}
+
+static void draw_oval(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
+ canvas->drawOval(r, p);
+}
+
+static void draw_rrect(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
+ SkScalar xRad = r.width() / 4.0f;
+ SkScalar yRad = r.height() / 4.0f;
+
+ SkRRect rr;
+ rr.setRectXY(r, xRad, yRad);
+ canvas->drawRRect(rr, p);
+}
+
+static void draw_drrect(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
+ SkScalar xRad = r.width() / 4.0f;
+ SkScalar yRad = r.height() / 4.0f;
+
+ SkRRect outer;
+ outer.setRectXY(r, xRad, yRad);
+ SkRRect inner = outer;
+ inner.inset(xRad, yRad);
+ canvas->drawDRRect(outer, inner, p);
+}
+
+static void draw_path(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
+ SkPath path;
+
+ path.moveTo(r.fLeft, r.fTop);
+ path.lineTo(r.fLeft, r.fBottom);
+ path.lineTo(r.fRight, r.fBottom);
+ path.close();
+
+ canvas->drawPath(path, p);
+}
+
+static void draw_points(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
+ SkPoint pts0[2] = { { r.fLeft, r.fTop }, { r.fRight, r.fBottom } };
+ SkPoint pts1[2] = { { r.fLeft, r.fBottom }, { r.fRight, r.fTop } };
+
+ canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts0, p);
+ canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts1, p);
+}
+
+static void draw_bitmap(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
+ SkBitmap bm;
+
+ bm.allocN32Pixels(64, 64);
+ SkCanvas temp(bm);
+ temp.clear(SK_ColorMAGENTA);
+
+ canvas->drawBitmapRect(bm, r, &p);
+}
+
+static const drawMth gDrawMthds[] = {
+ draw_rect, draw_oval, draw_rrect, draw_drrect, draw_path, draw_points, draw_bitmap
+};
+
+static void add_paint(SkImageFilter* filter, SkTArray<SkPaint>* paints) {
+ SkPaint& p = paints->push_back();
+ p.setImageFilter(filter);
+ SkASSERT(p.canComputeFastBounds());
+}
+
+// Create a selection of imagefilter-based paints to test
+static void create_paints(SkImageFilter* source, SkTArray<SkPaint>* paints) {
+ {
+ SkMatrix scale;
+ scale.setScale(2.0f, 2.0f);
+
+ SkAutoTUnref<SkMatrixImageFilter> scaleMIF(
+ SkMatrixImageFilter::Create(scale, SkPaint::kLow_FilterLevel, source));
+
+ add_paint(scaleMIF, paints);
+ }
+
+ {
+ SkMatrix rot;
+ rot.setRotate(-33.3f);
+
+ SkAutoTUnref<SkMatrixImageFilter> rotMIF(
+ SkMatrixImageFilter::Create(rot, SkPaint::kLow_FilterLevel, source));
+
+ add_paint(rotMIF, paints);
+ }
+
+ {
+ static const SkDropShadowImageFilter::ShadowMode kBoth =
+ SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode;
+
+ SkAutoTUnref<SkDropShadowImageFilter> dsif(
+ SkDropShadowImageFilter::Create(10.0f, 10.0f,
+ 3.0f, 3.0f,
+ SK_ColorRED, kBoth,
+ source, NULL, 0));
+
+ add_paint(dsif, paints);
+ }
+
+ {
+ SkAutoTUnref<SkDropShadowImageFilter> dsif(
+ SkDropShadowImageFilter::Create(27.0f, 27.0f,
+ 3.0f, 3.0f,
+ SK_ColorRED,
+ SkDropShadowImageFilter::kDrawShadowOnly_ShadowMode,
+ source, NULL, 0));
+
+ add_paint(dsif, paints);
+ }
+
+ {
+ SkAutoTUnref<SkBlurImageFilter> bif(SkBlurImageFilter::Create(3, 3, source));
+
+ add_paint(bif, paints);
+ }
+
+ {
+ SkAutoTUnref<SkOffsetImageFilter> oif(SkOffsetImageFilter::Create(15, 15, source));
+
+ add_paint(oif, paints);
+ }
+}
+
+// This GM visualizes the fast bounds for various combinations of geometry
+// and image filter
+class ImageFilterFastBoundGM : public GM {
+public:
+ ImageFilterFastBoundGM() {
+ this->setBGColor(0xFFCCCCCC);
+ }
+
+protected:
+ static const int kTileWidth = 100;
+ static const int kTileHeight = 100;
+ static const int kNumVertTiles = 6;
+ static const int kNumXtraCols = 2;
+
+ // SkPictureImageFilter doesn't support serialization yet.
+ uint32_t onGetFlags() const SK_OVERRIDE {
+ return kSkipPicture_Flag |
+ kSkipPipe_Flag |
+ kSkipPipeCrossProcess_Flag |
+ kSkipTiled_Flag |
+ kSkipScaledReplay_Flag;
+ }
+
+ SkString onShortName() SK_OVERRIDE{ return SkString("filterfastbounds"); }
+
+ SkISize onISize() SK_OVERRIDE{
+ return SkISize::Make((SK_ARRAY_COUNT(gDrawMthds) + kNumXtraCols) * kTileWidth,
+ kNumVertTiles * kTileHeight);
+ }
+
+ static void draw_geom_with_paint(drawMth draw, const SkIPoint& off,
+ SkCanvas* canvas, const SkPaint& p) {
+ SkPaint redStroked;
+ redStroked.setColor(SK_ColorRED);
+ redStroked.setStyle(SkPaint::kStroke_Style);
+
+ SkPaint blueStroked;
+ blueStroked.setColor(SK_ColorBLUE);
+ blueStroked.setStyle(SkPaint::kStroke_Style);
+
+ const SkRect r = SkRect::MakeLTRB(20, 20, 30, 30);
+ SkRect storage;
+
+ canvas->save();
+ canvas->translate(SkIntToScalar(off.fX), SkIntToScalar(off.fY));
+ canvas->scale(1.5f, 1.5f);
+
+ const SkRect& fastBound = p.computeFastBounds(r, &storage);
+
+ canvas->save();
+ canvas->clipRect(fastBound);
+ (*draw)(canvas, r, p);
+ canvas->restore();
+
+ canvas->drawRect(r, redStroked);
+ canvas->drawRect(fastBound, blueStroked);
+ canvas->restore();
+ }
+
+ static void draw_savelayer_with_paint(const SkIPoint& off,
+ SkCanvas* canvas,
+ const SkPaint& p) {
+ SkPaint redStroked;
+ redStroked.setColor(SK_ColorRED);
+ redStroked.setStyle(SkPaint::kStroke_Style);
+
+ SkPaint blueStroked;
+ blueStroked.setColor(SK_ColorBLUE);
+ blueStroked.setStyle(SkPaint::kStroke_Style);
+
+ const SkRect bounds = SkRect::MakeWH(10, 10);
+ SkRect storage;
+
+ canvas->save();
+ canvas->translate(30, 30);
+ canvas->translate(SkIntToScalar(off.fX), SkIntToScalar(off.fY));
+ canvas->scale(1.5f, 1.5f);
+
+ const SkRect& fastBound = p.computeFastBounds(bounds, &storage);
+
+ canvas->saveLayer(&fastBound, &p);
+ canvas->restore();
+
+ canvas->drawRect(bounds, redStroked);
+ canvas->drawRect(fastBound, blueStroked);
+ canvas->restore();
+ }
+
+ void onDraw(SkCanvas* canvas) SK_OVERRIDE{
+
+ SkPaint blackFill;
+
+ //-----------
+ // Normal paints (no source)
+ SkTArray<SkPaint> paints;
+ create_paints(NULL, &paints);
+
+ //-----------
+ // Paints with a PictureImageFilter as a source
+ SkAutoTUnref<SkPicture> pic;
+
+ {
+ SkPictureRecorder rec;
+
+ SkCanvas* c = rec.beginRecording(10, 10);
+ c->drawRect(SkRect::MakeWH(10, 10), blackFill);
+ pic.reset(rec.endRecording());
+ }
+
+ SkAutoTUnref<SkPictureImageFilter> pif(SkPictureImageFilter::Create(pic));
+
+ SkTArray<SkPaint> pifPaints;
+ create_paints(pif, &pifPaints);
+
+ //-----------
+ // Paints with a BitmapSource as a source
+ SkBitmap bm;
+
+ {
+ SkPaint p;
+ bm.allocN32Pixels(10, 10);
+ SkCanvas temp(bm);
+ temp.clear(SK_ColorYELLOW);
+ p.setColor(SK_ColorBLUE);
+ temp.drawRect(SkRect::MakeLTRB(5, 5, 10, 10), p);
+ p.setColor(SK_ColorGREEN);
+ temp.drawRect(SkRect::MakeLTRB(5, 0, 10, 5), p);
+ }
+
+ SkAutoTUnref<SkBitmapSource> bms(SkBitmapSource::Create(bm));
+
+ SkTArray<SkPaint> bmsPaints;
+ create_paints(bms, &bmsPaints);
+
+ //-----------
+ SkASSERT(paints.count() == kNumVertTiles);
+ SkASSERT(paints.count() == pifPaints.count());
+ SkASSERT(paints.count() == bmsPaints.count());
+
+ // horizontal separators
+ for (int i = 1; i < paints.count(); ++i) {
+ canvas->drawLine(0,
+ i*SkIntToScalar(kTileHeight),
+ SkIntToScalar((SK_ARRAY_COUNT(gDrawMthds) + kNumXtraCols)*kTileWidth),
+ i*SkIntToScalar(kTileHeight),
+ blackFill);
+ }
+ // vertical separators
+ for (int i = 0; i < (int)SK_ARRAY_COUNT(gDrawMthds) + kNumXtraCols; ++i) {
+ canvas->drawLine(SkIntToScalar(i * kTileWidth),
+ 0,
+ SkIntToScalar(i * kTileWidth),
+ SkIntToScalar(paints.count() * kTileWidth),
+ blackFill);
+ }
+
+ // A column of saveLayers with PictureImageFilters
+ for (int i = 0; i < pifPaints.count(); ++i) {
+ draw_savelayer_with_paint(SkIPoint::Make(0, i*kTileHeight),
+ canvas, pifPaints[i]);
+ }
+
+ // A column of saveLayers with BitmapSources
+ for (int i = 0; i < pifPaints.count(); ++i) {
+ draw_savelayer_with_paint(SkIPoint::Make(kTileWidth, i*kTileHeight),
+ canvas, bmsPaints[i]);
+ }
+
+ // Multiple columns with different geometry
+ for (int i = 0; i < (int)SK_ARRAY_COUNT(gDrawMthds); ++i) {
+ for (int j = 0; j < paints.count(); ++j) {
+ draw_geom_with_paint(*gDrawMthds[i],
+ SkIPoint::Make((i+kNumXtraCols) * kTileWidth, j*kTileHeight),
+ canvas, paints[j]);
+ }
+ }
+
+ }
+
+private:
+ typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM(return SkNEW(ImageFilterFastBoundGM);)
+
+}