add support for high quality image filtering on the GPU
R=bsalomon@google.com, reed@google.com
Review URL: https://codereview.chromium.org/23779003
git-svn-id: http://skia.googlecode.com/svn/trunk@11087 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/tilemodes_scaled.cpp b/gm/tilemodes_scaled.cpp
new file mode 100644
index 0000000..63a4ef7
--- /dev/null
+++ b/gm/tilemodes_scaled.cpp
@@ -0,0 +1,282 @@
+
+/*
+ * Copyright 2011 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 "SkPath.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkTypeface.h"
+
+// effects
+#include "SkGradientShader.h"
+#include "SkUnitMappers.h"
+#include "SkBlurDrawLooper.h"
+
+static void makebm(SkBitmap* bm, SkBitmap::Config config, int w, int h) {
+ bm->setConfig(config, w, h);
+ bm->allocPixels();
+ bm->eraseColor(SK_ColorTRANSPARENT);
+
+ SkCanvas canvas(*bm);
+ SkPoint pts[] = { { 0, 0 }, { SkIntToScalar(w), SkIntToScalar(h)} };
+ SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
+ SkScalar pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
+ SkPaint paint;
+
+ SkUnitMapper* um = NULL;
+
+ um = new SkCosineMapper;
+// um = new SkDiscreteMapper(12);
+
+ SkAutoUnref au(um);
+
+ paint.setDither(true);
+ paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
+ SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
+ canvas.drawPaint(paint);
+}
+
+static void setup(SkPaint* paint, const SkBitmap& bm, SkPaint::FilterLevel filter_level,
+ SkShader::TileMode tmx, SkShader::TileMode tmy) {
+ SkShader* shader = SkShader::CreateBitmapShader(bm, tmx, tmy);
+ paint->setShader(shader)->unref();
+ paint->setFilterLevel(filter_level);
+}
+
+static const SkBitmap::Config gConfigs[] = {
+ SkBitmap::kARGB_8888_Config,
+ SkBitmap::kRGB_565_Config,
+};
+
+class ScaledTilingGM : public skiagm::GM {
+ SkBlurDrawLooper fLooper;
+public:
+ ScaledTilingGM(bool powerOfTwoSize)
+ : fLooper(SkIntToScalar(1), SkIntToScalar(2), SkIntToScalar(2), 0x88000000)
+ , fPowerOfTwoSize(powerOfTwoSize) {
+ }
+
+ SkBitmap fTexture[SK_ARRAY_COUNT(gConfigs)];
+
+protected:
+
+ enum {
+ kPOTSize = 4,
+ kNPOTSize = 3,
+ };
+
+ SkString onShortName() {
+ SkString name("scaled_tilemodes");
+ if (!fPowerOfTwoSize) {
+ name.append("_npot");
+ }
+ return name;
+ }
+
+ SkISize onISize() { return SkISize::Make(880, 760); }
+
+ virtual void onOnceBeforeDraw() SK_OVERRIDE {
+ int size = fPowerOfTwoSize ? kPOTSize : kNPOTSize;
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gConfigs); i++) {
+ makebm(&fTexture[i], gConfigs[i], size, size);
+ }
+ }
+
+ virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+
+ float scale = 32.f/kPOTSize;
+
+ int size = fPowerOfTwoSize ? kPOTSize : kNPOTSize;
+
+ SkRect r = { 0, 0, SkIntToScalar(size*2), SkIntToScalar(size*2) };
+
+ static const char* gConfigNames[] = { "8888" , "565", "4444" };
+
+ static const SkPaint::FilterLevel gFilterLevels[] =
+ { SkPaint::kNone_FilterLevel,
+ SkPaint::kLow_FilterLevel,
+ SkPaint::kMedium_FilterLevel,
+ SkPaint::kHigh_FilterLevel };
+ static const char* gFilterNames[] = { "None", "Low", "Medium", "High" };
+
+ static const SkShader::TileMode gModes[] = { SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode };
+ static const char* gModeNames[] = { "C", "R", "M" };
+
+ SkScalar y = SkIntToScalar(24);
+ SkScalar x = SkIntToScalar(10)/scale;
+
+ for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
+ for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
+ SkPaint p;
+ SkString str;
+ p.setAntiAlias(true);
+ p.setDither(true);
+ p.setLooper(&fLooper);
+ str.printf("[%s,%s]", gModeNames[kx], gModeNames[ky]);
+
+ p.setTextAlign(SkPaint::kCenter_Align);
+ canvas->drawText(str.c_str(), str.size(), scale*(x + r.width()/2), y, p);
+
+ x += r.width() * 4 / 3;
+ }
+ }
+
+ y = SkIntToScalar(40) / scale;
+
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gConfigs); i++) {
+ for (size_t j = 0; j < SK_ARRAY_COUNT(gFilterLevels); j++) {
+ x = SkIntToScalar(10)/scale;
+ for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
+ for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
+ SkPaint paint;
+#if 1 // Temporary change to regen bitmap before each draw. This may help tracking down an issue
+ // on SGX where resizing NPOT textures to POT textures exhibits a driver bug.
+ if (!fPowerOfTwoSize) {
+ makebm(&fTexture[i], gConfigs[i], size, size);
+ }
+#endif
+ setup(&paint, fTexture[i], gFilterLevels[j], gModes[kx], gModes[ky]);
+ paint.setDither(true);
+
+ canvas->save();
+ canvas->scale(scale,scale);
+ canvas->translate(x, y);
+ canvas->drawRect(r, paint);
+ canvas->restore();
+
+ x += r.width() * 4 / 3;
+ }
+ }
+ {
+ SkPaint p;
+ SkString str;
+ p.setAntiAlias(true);
+ p.setLooper(&fLooper);
+ str.printf("%s, %s", gConfigNames[i], gFilterNames[j]);
+ canvas->drawText(str.c_str(), str.size(), scale*x, scale*(y + r.height() * 2 / 3), p);
+ }
+
+ y += r.height() * 4 / 3;
+ }
+ }
+ }
+
+private:
+ bool fPowerOfTwoSize;
+ typedef skiagm::GM INHERITED;
+};
+
+static const int gWidth = 32;
+static const int gHeight = 32;
+
+static SkShader* make_bm(SkShader::TileMode tx, SkShader::TileMode ty) {
+ SkBitmap bm;
+ makebm(&bm, SkBitmap::kARGB_8888_Config, gWidth, gHeight);
+ return SkShader::CreateBitmapShader(bm, tx, ty);
+}
+
+static SkShader* make_grad(SkShader::TileMode tx, SkShader::TileMode ty) {
+ SkPoint pts[] = { { 0, 0 }, { SkIntToScalar(gWidth), SkIntToScalar(gHeight)} };
+ SkPoint center = { SkIntToScalar(gWidth)/2, SkIntToScalar(gHeight)/2 };
+ SkScalar rad = SkIntToScalar(gWidth)/2;
+ SkColor colors[] = { 0xFFFF0000, 0xFF0044FF };
+
+ int index = (int)ty;
+ switch (index % 3) {
+ case 0:
+ return SkGradientShader::CreateLinear(pts, colors, NULL, SK_ARRAY_COUNT(colors), tx);
+ case 1:
+ return SkGradientShader::CreateRadial(center, rad, colors, NULL, SK_ARRAY_COUNT(colors), tx);
+ case 2:
+ return SkGradientShader::CreateSweep(center.fX, center.fY, colors, NULL, SK_ARRAY_COUNT(colors));
+ }
+
+ return NULL;
+}
+
+typedef SkShader* (*ShaderProc)(SkShader::TileMode, SkShader::TileMode);
+
+class ScaledTiling2GM : public skiagm::GM {
+ ShaderProc fProc;
+ SkString fName;
+public:
+ ScaledTiling2GM(ShaderProc proc, const char name[]) : fProc(proc) {
+ fName.printf("scaled_tilemode_%s", name);
+ }
+
+protected:
+ SkString onShortName() {
+ return fName;
+ }
+
+ SkISize onISize() { return SkISize::Make(880, 560); }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ canvas->scale(SkIntToScalar(3)/2, SkIntToScalar(3)/2);
+
+ const SkScalar w = SkIntToScalar(gWidth);
+ const SkScalar h = SkIntToScalar(gHeight);
+ SkRect r = { -w, -h, w*2, h*2 };
+
+ static const SkShader::TileMode gModes[] = {
+ SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode
+ };
+ static const char* gModeNames[] = {
+ "Clamp", "Repeat", "Mirror"
+ };
+
+ SkScalar y = SkIntToScalar(24);
+ SkScalar x = SkIntToScalar(66);
+
+ SkPaint p;
+ p.setAntiAlias(true);
+ p.setTextAlign(SkPaint::kCenter_Align);
+
+ for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
+ SkString str(gModeNames[kx]);
+ canvas->drawText(str.c_str(), str.size(), x + r.width()/2, y, p);
+ x += r.width() * 4 / 3;
+ }
+
+ y += SkIntToScalar(16) + h;
+ p.setTextAlign(SkPaint::kRight_Align);
+
+ for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
+ x = SkIntToScalar(16) + w;
+
+ SkString str(gModeNames[ky]);
+ canvas->drawText(str.c_str(), str.size(), x, y + h/2, p);
+
+ x += SkIntToScalar(50);
+ for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
+ SkPaint paint;
+ paint.setShader(fProc(gModes[kx], gModes[ky]))->unref();
+
+ canvas->save();
+ canvas->translate(x, y);
+ canvas->drawRect(r, paint);
+ canvas->restore();
+
+ x += r.width() * 4 / 3;
+ }
+ y += r.height() * 4 / 3;
+ }
+ }
+
+private:
+ typedef skiagm::GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM( return new ScaledTilingGM(true); )
+DEF_GM( return new ScaledTilingGM(false); )
+DEF_GM( return new ScaledTiling2GM(make_bm, "bitmap"); )
+DEF_GM( return new ScaledTiling2GM(make_grad, "gradient"); )