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Unified Diff: gm/filterindiabox.cpp

Issue 300113008: Make image scaling have floating point scales. Third attempt to land this (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Windows build fix Created 6 years, 7 months ago
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Index: gm/filterindiabox.cpp
diff --git a/gm/filterindiabox.cpp b/gm/filterindiabox.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c03dfba2936a2c1c1631738035a470a7aa76df22
--- /dev/null
+++ b/gm/filterindiabox.cpp
@@ -0,0 +1,139 @@
+/*
+ * 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 "SkGradientShader.h"
+
+#include "SkTypeface.h"
+#include "SkImageDecoder.h"
+#include "SkStream.h"
+
+#include "SkImageEncoder.h"
+#include "SkBitmapScaler.h"
+#include "SkBitmapProcState.h"
+
+static SkSize computeSize(const SkBitmap& bm, const SkMatrix& mat) {
+ SkRect bounds = SkRect::MakeWH(SkIntToScalar(bm.width()),
+ SkIntToScalar(bm.height()));
+ mat.mapRect(&bounds);
+ return SkSize::Make(bounds.width(), bounds.height());
+}
+
+static void draw_row(SkCanvas* canvas, const SkBitmap& bm, const SkMatrix& mat, SkScalar dx) {
+ SkPaint paint;
+
+ SkAutoCanvasRestore acr(canvas, true);
+
+ canvas->drawBitmapMatrix(bm, mat, &paint);
+
+ paint.setFilterLevel(SkPaint::kLow_FilterLevel);
+ canvas->translate(dx, 0);
+ canvas->drawBitmapMatrix(bm, mat, &paint);
+
+ paint.setFilterLevel(SkPaint::kMedium_FilterLevel);
+ canvas->translate(dx, 0);
+ canvas->drawBitmapMatrix(bm, mat, &paint);
+
+ paint.setFilterLevel(SkPaint::kHigh_FilterLevel);
+ canvas->translate(dx, 0);
+ canvas->drawBitmapMatrix(bm, mat, &paint);
+}
+
+class FilterIndiaBoxGM : public skiagm::GM {
+ void onOnceBeforeDraw() {
+
+ this->makeBitmap();
+
+ SkScalar cx = SkScalarHalf(fBM.width());
+ SkScalar cy = SkScalarHalf(fBM.height());
+
+ float vertScale = 30.0f/55.0f;
+ float horizScale = 150.0f/200.0f;
+
+ fMatrix[0].setScale(horizScale, vertScale);
+ fMatrix[1].setRotate(30, cx, cy); fMatrix[1].postScale(horizScale, vertScale);
+ }
+
+public:
+ SkBitmap fBM;
+ SkMatrix fMatrix[2];
+ SkString fName;
+
+ FilterIndiaBoxGM()
+ {
+ this->setBGColor(0xFFDDDDDD);
+ }
+
+ FilterIndiaBoxGM(const char filename[])
+ : fFilename(filename)
+ {
+ fName.printf("filterindiabox");
+ }
+
+protected:
+ virtual uint32_t onGetFlags() const SK_OVERRIDE {
+ return kSkipTiled_Flag;
+ }
+
+ virtual SkString onShortName() SK_OVERRIDE {
+ return fName;
+ }
+
+ virtual SkISize onISize() SK_OVERRIDE {
+ return SkISize::Make(1024, 768);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+
+ canvas->translate(10, 10);
+ for (size_t i = 0; i < SK_ARRAY_COUNT(fMatrix); ++i) {
+ SkSize size = computeSize(fBM, fMatrix[i]);
+ size.fWidth += 20;
+ size.fHeight += 20;
+
+ draw_row(canvas, fBM, fMatrix[i], size.fWidth);
+ canvas->translate(0, size.fHeight);
+ }
+ }
+
+ protected:
+ SkString fFilename;
+ int fSize;
+
+ SkScalar getScale() {
+ return 192.f/fSize;
+ }
+
+ void makeBitmap() {
+ SkString path(skiagm::GM::gResourcePath);
+ path.append("/");
+ path.append(fFilename);
+
+ SkImageDecoder *codec = NULL;
+ SkFILEStream stream(path.c_str());
+ if (stream.isValid()) {
+ codec = SkImageDecoder::Factory(&stream);
+ }
+ if (codec) {
+ stream.rewind();
+ codec->decode(&stream, &fBM, SkBitmap::kARGB_8888_Config,
+ SkImageDecoder::kDecodePixels_Mode);
+ SkDELETE(codec);
+ } else {
+ fBM.allocN32Pixels(1, 1);
+ *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
+ }
+ fSize = fBM.height();
+ }
+ private:
+ typedef skiagm::GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+
+DEF_GM( return new FilterIndiaBoxGM("box.gif"); )
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