tests/DrawBitmapRectTest.cpp - platform/external/skia - Git at Google


 /*
  * 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 "Test.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkShader.h"
 #include "SkRandom.h"
 #include "SkMatrixUtils.h"

 static void rand_matrix(SkMatrix* mat, SkRandom& rand, unsigned mask) {
     mat->setIdentity();
     if (mask & SkMatrix::kTranslate_Mask) {
         mat->postTranslate(rand.nextSScalar1(), rand.nextSScalar1());
     }
     if (mask & SkMatrix::kScale_Mask) {
         mat->postScale(rand.nextSScalar1(), rand.nextSScalar1());
     }
     if (mask & SkMatrix::kAffine_Mask) {
         mat->postRotate(rand.nextSScalar1() * 360);
     }
     if (mask & SkMatrix::kPerspective_Mask) {
         mat->setPerspX(rand.nextSScalar1());
         mat->setPerspY(rand.nextSScalar1());
     }
 }

 static void rand_size(SkISize* size, SkRandom& rand) {
     size->set(rand.nextU() & 0xFFFF, rand.nextU() & 0xFFFF);
 }

 static bool treat_as_sprite(const SkMatrix& mat, const SkISize& size,
                             unsigned bits) {
     return SkTreatAsSprite(mat, size.width(), size.height(), bits);
 }

 static void test_treatAsSprite(skiatest::Reporter* reporter) {
     const unsigned bilerBits = kSkSubPixelBitsForBilerp;

     SkMatrix mat;
     SkISize  size;
     SkRandom rand;

     // assert: translate-only no-filter can always be treated as sprite
     for (int i = 0; i < 1000; ++i) {
         rand_matrix(&mat, rand, SkMatrix::kTranslate_Mask);
         for (int j = 0; j < 1000; ++j) {
             rand_size(&size, rand);
             REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, 0));
         }
     }

     // assert: rotate/perspect is never treated as sprite
     for (int i = 0; i < 1000; ++i) {
         rand_matrix(&mat, rand, SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask);
         for (int j = 0; j < 1000; ++j) {
             rand_size(&size, rand);
             REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, 0));
             REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
         }
     }

     size.set(500, 600);

     const SkScalar tooMuchSubpixel = SkFloatToScalar(100.1f);
     mat.setTranslate(tooMuchSubpixel, 0);
     REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
     mat.setTranslate(0, tooMuchSubpixel);
     REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

     const SkScalar tinySubPixel = SkFloatToScalar(100.02f);
     mat.setTranslate(tinySubPixel, 0);
     REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
     mat.setTranslate(0, tinySubPixel);
     REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));

     const SkScalar twoThirds = SK_Scalar1 * 2 / 3;
     const SkScalar bigScale = SkScalarDiv(size.width() + twoThirds, size.width());
     mat.setScale(bigScale, bigScale);
     REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, false));
     REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

     const SkScalar oneThird = SK_Scalar1 / 3;
     const SkScalar smallScale = SkScalarDiv(size.width() + oneThird, size.width());
     mat.setScale(smallScale, smallScale);
     REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
     REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

     const SkScalar oneFortyth = SK_Scalar1 / 40;
     const SkScalar tinyScale = SkScalarDiv(size.width() + oneFortyth, size.width());
     mat.setScale(tinyScale, tinyScale);
     REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
     REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
 }

 static void assert_ifDrawnTo(skiatest::Reporter* reporter,
                              const SkBitmap& bm, bool shouldBeDrawn) {
     for (int y = 0; y < bm.height(); ++y) {
         for (int x = 0; x < bm.width(); ++x) {
             if (shouldBeDrawn) {
                 if (0 == *bm.getAddr32(x, y)) {
                     REPORTER_ASSERT(reporter, false);
                     return;
                 }
             } else {
                 // should not be drawn
                 if (*bm.getAddr32(x, y)) {
                     REPORTER_ASSERT(reporter, false);
                     return;
                 }
             }
         }
     }
 }

 static void test_wacky_bitmapshader(skiatest::Reporter* reporter,
                                     int width, int height, bool shouldBeDrawn) {
     SkBitmap dev;
     dev.setConfig(SkBitmap::kARGB_8888_Config, 0x56F, 0x4f6);
     dev.allocPixels();
     dev.eraseColor(SK_ColorTRANSPARENT);  // necessary, so we know if we draw to it

     SkMatrix matrix;

     SkCanvas c(dev);
     matrix.setAll(SkFloatToScalar(-119.34097f),
                   SkFloatToScalar(-43.436558f),
                   SkFloatToScalar(93489.945f),
                   SkFloatToScalar(43.436558f),
                   SkFloatToScalar(-119.34097f),
                   SkFloatToScalar(123.98426f),
                   0, 0, SK_Scalar1);
     c.concat(matrix);

     SkBitmap bm;
     bm.setConfig(SkBitmap::kARGB_8888_Config, width, height);
     bm.allocPixels();
     bm.eraseColor(SK_ColorRED);

     SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
                                                SkShader::kRepeat_TileMode);
     matrix.setAll(SkFloatToScalar(0.0078740157f),
                   0,
                   SkIntToScalar(249),
                   0,
                   SkFloatToScalar(0.0078740157f),
                   SkIntToScalar(239),
                   0, 0, SK_Scalar1);
     s->setLocalMatrix(matrix);

     SkPaint paint;
     paint.setShader(s)->unref();

     SkRect r = SkRect::MakeXYWH(681, 239, 695, 253);
     c.drawRect(r, paint);

     assert_ifDrawnTo(reporter, dev, shouldBeDrawn);
 }

 /*
  *  Original bug was asserting that the matrix-proc had generated a (Y) value
  *  that was out of range. This led (in the release build) to the sampler-proc
  *  reading memory out-of-bounds of the original bitmap.
  *
  *  We were numerically overflowing our 16bit coordinates that we communicate
  *  between these two procs. The fixes was in two parts:
  *
  *  1. Just don't draw bitmaps larger than 64K-1 in width or height, since we
  *     can't represent those coordinates in our transport format (yet).
  *  2. Perform an unsigned shift during the calculation, so we don't get
  *     sign-extension bleed when packing the two values (X,Y) into our 32bit
  *     slot.
  *
  *  This tests exercises the original setup, plus 3 more to ensure that we can,
  *  in fact, handle bitmaps at 64K-1 (assuming we don't exceed the total
  *  memory allocation limit).
  */
 static void test_giantrepeat_crbug118018(skiatest::Reporter* reporter) {
 #ifdef SK_SCALAR_IS_FLOAT
     static const struct {
         int fWidth;
         int fHeight;
         bool fExpectedToDraw;
     } gTests[] = {
         { 0x1b294, 0x7f,  false },   // crbug 118018 (width exceeds 64K)
         { 0xFFFF, 0x7f,    true },   // should draw, test max width
         { 0x7f, 0xFFFF,    true },   // should draw, test max height
         { 0xFFFF, 0xFFFF, false },   // allocation fails (too much RAM)
     };

     for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); ++i) {
         test_wacky_bitmapshader(reporter,
                                 gTests[i].fWidth, gTests[i].fHeight,
                                 gTests[i].fExpectedToDraw);
     }
 #endif
 }

 ///////////////////////////////////////////////////////////////////////////////

 static void test_nan_antihair(skiatest::Reporter* reporter) {
     SkBitmap bm;
     bm.setConfig(SkBitmap::kARGB_8888_Config, 20, 20);
     bm.allocPixels();

     SkCanvas canvas(bm);

     SkPath path;
     path.moveTo(0, 0);
     path.lineTo(10, SK_ScalarNaN);

     SkPaint paint;
     paint.setAntiAlias(true);
     paint.setStyle(SkPaint::kStroke_Style);

     // before our fix to SkScan_Antihair.cpp to check for integral NaN (0x800...)
     // this would trigger an assert/crash.
     //
     // see rev. 3558
     canvas.drawPath(path, paint);
 }

 static bool check_for_all_zeros(const SkBitmap& bm) {
     SkAutoLockPixels alp(bm);

     size_t count = bm.width() * bm.bytesPerPixel();
     for (int y = 0; y < bm.height(); y++) {
         const uint8_t* ptr = reinterpret_cast<const uint8_t*>(bm.getAddr(0, y));
         for (size_t i = 0; i < count; i++) {
             if (ptr[i]) {
                 return false;
             }
         }
     }
     return true;
 }

 static const int gWidth = 256;
 static const int gHeight = 256;

 static void create(SkBitmap* bm, SkBitmap::Config config, SkColor color) {
     bm->setConfig(config, gWidth, gHeight);
     bm->allocPixels();
     bm->eraseColor(color);
 }

 static void TestDrawBitmapRect(skiatest::Reporter* reporter) {
     SkBitmap src, dst;

     create(&src, SkBitmap::kARGB_8888_Config, 0xFFFFFFFF);
     create(&dst, SkBitmap::kARGB_8888_Config, 0);

     SkCanvas canvas(dst);

     SkIRect srcR = { gWidth, 0, gWidth + 16, 16 };
     SkRect  dstR = { 0, 0, SkIntToScalar(16), SkIntToScalar(16) };

     canvas.drawBitmapRect(src, &srcR, dstR, NULL);

     // ensure that we draw nothing if srcR does not intersect the bitmap
     REPORTER_ASSERT(reporter, check_for_all_zeros(dst));

     test_nan_antihair(reporter);
     test_giantrepeat_crbug118018(reporter);

     test_treatAsSprite(reporter);
 }

 #include "TestClassDef.h"
 DEFINE_TESTCLASS("DrawBitmapRect", TestDrawBitmapRectClass, TestDrawBitmapRect)

	/*
	* 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 "Test.h"
	#include "SkBitmap.h"
	#include "SkCanvas.h"
	#include "SkShader.h"
	#include "SkRandom.h"
	#include "SkMatrixUtils.h"

	static void rand_matrix(SkMatrix* mat, SkRandom& rand, unsigned mask) {
	mat->setIdentity();
	if (mask & SkMatrix::kTranslate_Mask) {
	mat->postTranslate(rand.nextSScalar1(), rand.nextSScalar1());
	}
	if (mask & SkMatrix::kScale_Mask) {
	mat->postScale(rand.nextSScalar1(), rand.nextSScalar1());
	}
	if (mask & SkMatrix::kAffine_Mask) {
	mat->postRotate(rand.nextSScalar1() * 360);
	}
	if (mask & SkMatrix::kPerspective_Mask) {
	mat->setPerspX(rand.nextSScalar1());
	mat->setPerspY(rand.nextSScalar1());
	}
	}

	static void rand_size(SkISize* size, SkRandom& rand) {
	size->set(rand.nextU() & 0xFFFF, rand.nextU() & 0xFFFF);
	}

	static bool treat_as_sprite(const SkMatrix& mat, const SkISize& size,
	unsigned bits) {
	return SkTreatAsSprite(mat, size.width(), size.height(), bits);
	}

	static void test_treatAsSprite(skiatest::Reporter* reporter) {
	const unsigned bilerBits = kSkSubPixelBitsForBilerp;

	SkMatrix mat;
	SkISize size;
	SkRandom rand;

	// assert: translate-only no-filter can always be treated as sprite
	for (int i = 0; i < 1000; ++i) {
	rand_matrix(&mat, rand, SkMatrix::kTranslate_Mask);
	for (int j = 0; j < 1000; ++j) {
	rand_size(&size, rand);
	REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, 0));
	}
	}

	// assert: rotate/perspect is never treated as sprite
	for (int i = 0; i < 1000; ++i) {
	rand_matrix(&mat, rand, SkMatrix::kAffine_Mask \| SkMatrix::kPerspective_Mask);
	for (int j = 0; j < 1000; ++j) {
	rand_size(&size, rand);
	REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, 0));
	REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
	}
	}

	size.set(500, 600);

	const SkScalar tooMuchSubpixel = SkFloatToScalar(100.1f);
	mat.setTranslate(tooMuchSubpixel, 0);
	REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
	mat.setTranslate(0, tooMuchSubpixel);
	REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

	const SkScalar tinySubPixel = SkFloatToScalar(100.02f);
	mat.setTranslate(tinySubPixel, 0);
	REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
	mat.setTranslate(0, tinySubPixel);
	REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));

	const SkScalar twoThirds = SK_Scalar1 * 2 / 3;
	const SkScalar bigScale = SkScalarDiv(size.width() + twoThirds, size.width());
	mat.setScale(bigScale, bigScale);
	REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, false));
	REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

	const SkScalar oneThird = SK_Scalar1 / 3;
	const SkScalar smallScale = SkScalarDiv(size.width() + oneThird, size.width());
	mat.setScale(smallScale, smallScale);
	REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
	REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));

	const SkScalar oneFortyth = SK_Scalar1 / 40;
	const SkScalar tinyScale = SkScalarDiv(size.width() + oneFortyth, size.width());
	mat.setScale(tinyScale, tinyScale);
	REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
	REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
	}

	static void assert_ifDrawnTo(skiatest::Reporter* reporter,
	const SkBitmap& bm, bool shouldBeDrawn) {
	for (int y = 0; y < bm.height(); ++y) {
	for (int x = 0; x < bm.width(); ++x) {
	if (shouldBeDrawn) {
	if (0 == *bm.getAddr32(x, y)) {
	REPORTER_ASSERT(reporter, false);
	return;
	}
	} else {
	// should not be drawn
	if (*bm.getAddr32(x, y)) {
	REPORTER_ASSERT(reporter, false);
	return;
	}
	}
	}
	}
	}

	static void test_wacky_bitmapshader(skiatest::Reporter* reporter,
	int width, int height, bool shouldBeDrawn) {
	SkBitmap dev;
	dev.setConfig(SkBitmap::kARGB_8888_Config, 0x56F, 0x4f6);
	dev.allocPixels();
	dev.eraseColor(SK_ColorTRANSPARENT); // necessary, so we know if we draw to it

	SkMatrix matrix;

	SkCanvas c(dev);
	matrix.setAll(SkFloatToScalar(-119.34097f),
	SkFloatToScalar(-43.436558f),
	SkFloatToScalar(93489.945f),
	SkFloatToScalar(43.436558f),
	SkFloatToScalar(-119.34097f),
	SkFloatToScalar(123.98426f),
	0, 0, SK_Scalar1);
	c.concat(matrix);

	SkBitmap bm;
	bm.setConfig(SkBitmap::kARGB_8888_Config, width, height);
	bm.allocPixels();
	bm.eraseColor(SK_ColorRED);

	SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
	SkShader::kRepeat_TileMode);
	matrix.setAll(SkFloatToScalar(0.0078740157f),
	0,
	SkIntToScalar(249),
	0,
	SkFloatToScalar(0.0078740157f),
	SkIntToScalar(239),
	0, 0, SK_Scalar1);
	s->setLocalMatrix(matrix);

	SkPaint paint;
	paint.setShader(s)->unref();

	SkRect r = SkRect::MakeXYWH(681, 239, 695, 253);
	c.drawRect(r, paint);

	assert_ifDrawnTo(reporter, dev, shouldBeDrawn);
	}

	/*
	* Original bug was asserting that the matrix-proc had generated a (Y) value
	* that was out of range. This led (in the release build) to the sampler-proc
	* reading memory out-of-bounds of the original bitmap.
	*
	* We were numerically overflowing our 16bit coordinates that we communicate
	* between these two procs. The fixes was in two parts:
	*
	* 1. Just don't draw bitmaps larger than 64K-1 in width or height, since we
	* can't represent those coordinates in our transport format (yet).
	* 2. Perform an unsigned shift during the calculation, so we don't get
	* sign-extension bleed when packing the two values (X,Y) into our 32bit
	* slot.
	*
	* This tests exercises the original setup, plus 3 more to ensure that we can,
	* in fact, handle bitmaps at 64K-1 (assuming we don't exceed the total
	* memory allocation limit).
	*/
	static void test_giantrepeat_crbug118018(skiatest::Reporter* reporter) {
	#ifdef SK_SCALAR_IS_FLOAT
	static const struct {
	int fWidth;
	int fHeight;
	bool fExpectedToDraw;
	} gTests[] = {
	{ 0x1b294, 0x7f, false }, // crbug 118018 (width exceeds 64K)
	{ 0xFFFF, 0x7f, true }, // should draw, test max width
	{ 0x7f, 0xFFFF, true }, // should draw, test max height
	{ 0xFFFF, 0xFFFF, false }, // allocation fails (too much RAM)
	};

	for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); ++i) {
	test_wacky_bitmapshader(reporter,
	gTests[i].fWidth, gTests[i].fHeight,
	gTests[i].fExpectedToDraw);
	}
	#endif
	}

	///////////////////////////////////////////////////////////////////////////////

	static void test_nan_antihair(skiatest::Reporter* reporter) {
	SkBitmap bm;
	bm.setConfig(SkBitmap::kARGB_8888_Config, 20, 20);
	bm.allocPixels();

	SkCanvas canvas(bm);

	SkPath path;
	path.moveTo(0, 0);
	path.lineTo(10, SK_ScalarNaN);

	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setStyle(SkPaint::kStroke_Style);

	// before our fix to SkScan_Antihair.cpp to check for integral NaN (0x800...)
	// this would trigger an assert/crash.
	//
	// see rev. 3558
	canvas.drawPath(path, paint);
	}

	static bool check_for_all_zeros(const SkBitmap& bm) {
	SkAutoLockPixels alp(bm);

	size_t count = bm.width() * bm.bytesPerPixel();
	for (int y = 0; y < bm.height(); y++) {
	const uint8_t* ptr = reinterpret_cast<const uint8_t*>(bm.getAddr(0, y));
	for (size_t i = 0; i < count; i++) {
	if (ptr[i]) {
	return false;
	}
	}
	}
	return true;
	}

	static const int gWidth = 256;
	static const int gHeight = 256;

	static void create(SkBitmap* bm, SkBitmap::Config config, SkColor color) {
	bm->setConfig(config, gWidth, gHeight);
	bm->allocPixels();
	bm->eraseColor(color);
	}

	static void TestDrawBitmapRect(skiatest::Reporter* reporter) {
	SkBitmap src, dst;

	create(&src, SkBitmap::kARGB_8888_Config, 0xFFFFFFFF);
	create(&dst, SkBitmap::kARGB_8888_Config, 0);

	SkCanvas canvas(dst);

	SkIRect srcR = { gWidth, 0, gWidth + 16, 16 };
	SkRect dstR = { 0, 0, SkIntToScalar(16), SkIntToScalar(16) };

	canvas.drawBitmapRect(src, &srcR, dstR, NULL);

	// ensure that we draw nothing if srcR does not intersect the bitmap
	REPORTER_ASSERT(reporter, check_for_all_zeros(dst));

	test_nan_antihair(reporter);
	test_giantrepeat_crbug118018(reporter);

	test_treatAsSprite(reporter);
	}

	#include "TestClassDef.h"
	DEFINE_TESTCLASS("DrawBitmapRect", TestDrawBitmapRectClass, TestDrawBitmapRect)