79fbb40bca
SkDrawLooper carries some state during draws. This CL extracts this state into a separate class Context, which is then passed by the users of SkDrawLooper into the appropriate methods. This is a step towards making SkDrawLooper immutable. BUG=skia:2141 R=scroggo@google.com, reed@google.com, sugoi@google.com Author: dominikg@chromium.org Review URL: https://codereview.chromium.org/155513012 git-svn-id: http://skia.googlecode.com/svn/trunk@13760 2bbb7eff-a529-9590-31e7-b0007b416f81
91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkCanvas.h"
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#include "SkDrawLooper.h"
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#include "SkTypes.h"
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#include "Test.h"
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/*
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* Subclass of looper that just draws once, with an offset in X.
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*/
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class TestLooper : public SkDrawLooper {
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public:
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virtual SkDrawLooper::Context* createContext(SkCanvas*, void* storage) const SK_OVERRIDE {
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return SkNEW_PLACEMENT(storage, TestDrawLooperContext);
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}
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virtual size_t contextSize() const SK_OVERRIDE { return sizeof(TestDrawLooperContext); }
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#ifdef SK_DEVELOPER
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virtual void toString(SkString* str) const SK_OVERRIDE {
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str->append("TestLooper:");
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}
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#endif
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private:
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class TestDrawLooperContext : public SkDrawLooper::Context {
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public:
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TestDrawLooperContext() : fOnce(true) {}
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virtual ~TestDrawLooperContext() {}
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virtual bool next(SkCanvas* canvas, SkPaint*) SK_OVERRIDE {
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if (fOnce) {
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fOnce = false;
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canvas->translate(SkIntToScalar(10), 0);
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return true;
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}
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return false;
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}
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private:
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bool fOnce;
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};
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SK_DECLARE_UNFLATTENABLE_OBJECT()
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};
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static void test_drawBitmap(skiatest::Reporter* reporter) {
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SkBitmap src;
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src.allocN32Pixels(10, 10);
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src.eraseColor(SK_ColorWHITE);
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SkBitmap dst;
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dst.allocN32Pixels(10, 10);
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dst.eraseColor(SK_ColorTRANSPARENT);
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SkCanvas canvas(dst);
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SkPaint paint;
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// we are initially transparent
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REPORTER_ASSERT(reporter, 0 == *dst.getAddr32(5, 5));
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// we see the bitmap drawn
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canvas.drawBitmap(src, 0, 0, &paint);
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REPORTER_ASSERT(reporter, 0xFFFFFFFF == *dst.getAddr32(5, 5));
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// reverify we are clear again
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dst.eraseColor(SK_ColorTRANSPARENT);
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REPORTER_ASSERT(reporter, 0 == *dst.getAddr32(5, 5));
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// if the bitmap is clipped out, we don't draw it
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canvas.drawBitmap(src, SkIntToScalar(-10), 0, &paint);
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REPORTER_ASSERT(reporter, 0 == *dst.getAddr32(5, 5));
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// now install our looper, which will draw, since it internally translates
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// to the left. The test is to ensure that canvas' quickReject machinary
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// allows us through, even though sans-looper we would look like we should
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// be clipped out.
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paint.setLooper(new TestLooper)->unref();
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canvas.drawBitmap(src, SkIntToScalar(-10), 0, &paint);
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REPORTER_ASSERT(reporter, 0xFFFFFFFF == *dst.getAddr32(5, 5));
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}
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DEF_TEST(QuickReject, reporter) {
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test_drawBitmap(reporter);
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}
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