/src/skia/fuzz/FuzzGradients.cpp

Source (jump to first uncovered line)
/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "fuzz/Fuzz.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkSurface.h"
#include "include/effects/SkGradientShader.h"
#include "src/base/SkTLazy.h"
#include "src/core/SkDebugUtils.h"
#include "tools/flags/CommandLineFlags.h"

#include <algorithm>
#include <vector>

static DEFINE_bool2(verbose, v, false, "log verbose linear gradient description");

const int MAX_COUNT = 400;

void makeMatrix(Fuzz* fuzz, SkMatrix* m) {
    SkScalar mat[9];
    fuzz->nextN(mat, 9);
    m->set9(mat);
}

void initGradientParams(Fuzz* fuzz, std::vector<SkColor>* colors,
                        std::vector<SkScalar>* pos, SkTileMode* mode) {
    int count;
    fuzz->nextRange(&count, 0, MAX_COUNT);

    // Use a uint8_t to conserve bytes.  This makes our "fuzzed bytes footprint"
    // smaller, which leads to more efficient fuzzing.
    uint8_t m;
    fuzz->nextRange(&m, 0, 2);
    *mode = static_cast<SkTileMode>(m);

    colors->clear();
    pos   ->clear();
    for (int i = 0; i < count; i++) {
        SkColor c;
        SkScalar s;
        fuzz->next(&c, &s);
        colors->push_back(c);
        pos   ->push_back(s);
    }
    if (count) {
        std::sort(pos->begin(), pos->end());
        // The order matters.  If count == 1, we want pos == 0.
        (*pos)[count - 1] = 1;
        (*pos)[0]         = 0;
    }
}

static void logOptionalMatrix(const char* label, const SkMatrix* m) {
    if (!m) {
        return;
    }

    SkDEBUGF("  %s: [ ", label);
    for (int i = 0; i < 9; ++i) {
        SkDEBUGF("%.9g ", m->get(i));
    }
    SkDEBUGF("]\n");
}

static void logLinearGradient(const SkPoint pts[2],
                              const std::vector<SkColor>& colors,
                              const std::vector<SkScalar>& pos,
                              SkTileMode mode,
                              uint32_t flags,
                              const SkMatrix* localMatrix,
                              const SkMatrix* globalMatrix) {
    if (!FLAGS_verbose) {
        return;
    }

    SkDebugf("--- fuzzLinearGradient ---\n");
    SkDebugf("  pts:\t\t[ (%.9g %.9g) (%.9g %.9g) ]\n",
             pts[0].x(), pts[0].y(), pts[1].x(), pts[1].y());
    SkDebugf("  colors:\t[ ");
    for (auto color : colors) {
        SkDebugf("0x%x ", color);
    }

    SkDebugf("]\n  pos:\t\t");
    if (pos.empty()) {
        SkDebugf("nullptr");
    } else {
        SkDebugf("[ ");
        for (auto p : pos) {
            SkDebugf("%f ", p);
        }
    }
    SkDebugf("]\n");

    SkDebugf("  mode:\t\t%s\n", SkTileModeToStr(mode));
    SkDebugf("  flags:\t0x%x\n", flags);
    logOptionalMatrix("local matrix", localMatrix);
    logOptionalMatrix("global matrix", globalMatrix);
}

void fuzzLinearGradient(Fuzz* fuzz) {
    SkPoint pts[2];
    fuzz->next(&pts[0].fX, &pts[0].fY, &pts[1].fX, &pts[1].fY);
    bool useLocalMatrix, useGlobalMatrix;
    fuzz->next(&useLocalMatrix, &useGlobalMatrix);

    std::vector<SkColor> colors;
    std::vector<SkScalar> pos;
    SkTileMode mode;
    initGradientParams(fuzz, &colors, &pos, &mode);

    SkPaint p;
    uint32_t flags;
    fuzz->next(&flags);

    SkTLazy<SkMatrix> localMatrix;
    if (useLocalMatrix) {
        makeMatrix(fuzz, localMatrix.init());
    }
    p.setShader(SkGradientShader::MakeLinear(pts, colors.data(), pos.data(),
        colors.size(), mode, flags, localMatrix.getMaybeNull()));

    sk_sp<SkSurface> surface(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(50, 50)));
    if (useGlobalMatrix) {
        SkMatrix gm;
        makeMatrix(fuzz, &gm);
        logLinearGradient(pts, colors, pos, mode, flags, localMatrix.getMaybeNull(), &gm);
        SkCanvas* c = surface->getCanvas();
        c->setMatrix(gm);
        c->drawPaint(p);
    } else {
        logLinearGradient(pts, colors, pos, mode, flags, localMatrix.getMaybeNull(), nullptr);
        surface->getCanvas()->drawPaint(p);
    }
}

void fuzzRadialGradient(Fuzz* fuzz) {
    SkPoint center;
    fuzz->next(&center.fX, &center.fY);
    SkScalar radius;
    bool useLocalMatrix, useGlobalMatrix;
    fuzz->next(&radius, &useLocalMatrix, &useGlobalMatrix);


    std::vector<SkColor> colors;
    std::vector<SkScalar> pos;
    SkTileMode mode;
    initGradientParams(fuzz, &colors, &pos, &mode);

    SkPaint p;
    uint32_t flags;
    fuzz->next(&flags);

    SkTLazy<SkMatrix> localMatrix;
    if (useLocalMatrix) {
        makeMatrix(fuzz, localMatrix.init());
    }
    p.setShader(SkGradientShader::MakeRadial(center, radius, colors.data(),
        pos.data(), colors.size(), mode, flags, localMatrix.getMaybeNull()));

    sk_sp<SkSurface> surface(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(50, 50)));
    if (useGlobalMatrix) {
        SkMatrix gm;
        makeMatrix(fuzz, &gm);
        SkCanvas* c = surface->getCanvas();
        c->setMatrix(gm);
        c->drawPaint(p);
    } else {
        surface->getCanvas()->drawPaint(p);
    }
}

void fuzzTwoPointConicalGradient(Fuzz* fuzz) {
    SkPoint start;
    fuzz->next(&start.fX, &start.fY);
    SkPoint end;
    fuzz->next(&end.fX, &end.fY);
    SkScalar startRadius, endRadius;
    bool useLocalMatrix, useGlobalMatrix;
    fuzz->next(&startRadius, &endRadius, &useLocalMatrix, &useGlobalMatrix);

    std::vector<SkColor> colors;
    std::vector<SkScalar> pos;
    SkTileMode mode;
    initGradientParams(fuzz, &colors, &pos, &mode);

    SkPaint p;
    uint32_t flags;
    fuzz->next(&flags);

    SkTLazy<SkMatrix> localMatrix;
    if (useLocalMatrix) {
        makeMatrix(fuzz, localMatrix.init());
    }
    p.setShader(SkGradientShader::MakeTwoPointConical(start, startRadius,
        end, endRadius, colors.data(), pos.data(), colors.size(), mode,
        flags, localMatrix.getMaybeNull()));

    sk_sp<SkSurface> surface(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(50, 50)));
    if (useGlobalMatrix) {
        SkMatrix gm;
        makeMatrix(fuzz, &gm);
        SkCanvas* c = surface->getCanvas();
        c->setMatrix(gm);
        c->drawPaint(p);
    } else {
        surface->getCanvas()->drawPaint(p);
    }
}

void fuzzSweepGradient(Fuzz* fuzz) {
    SkScalar cx, cy;
    bool useLocalMatrix, useGlobalMatrix;
    fuzz->next(&cx, &cy, &useLocalMatrix, &useGlobalMatrix);

    std::vector<SkColor> colors;
    std::vector<SkScalar> pos;
    SkTileMode mode;
    initGradientParams(fuzz, &colors, &pos, &mode);

    SkPaint p;
    if (useLocalMatrix) {
        SkMatrix m;
        makeMatrix(fuzz, &m);
        uint32_t flags;
        fuzz->next(&flags);

        p.setShader(SkGradientShader::MakeSweep(cx, cy, colors.data(),
            pos.data(), colors.size(), flags, &m));
    } else {
        p.setShader(SkGradientShader::MakeSweep(cx, cy, colors.data(),
            pos.data(), colors.size()));
    }

    sk_sp<SkSurface> surface(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(50, 50)));
    if (useGlobalMatrix) {
        SkMatrix gm;
        makeMatrix(fuzz, &gm);
        SkCanvas* c = surface->getCanvas();
        c->setMatrix(gm);
        c->drawPaint(p);
    } else {
        surface->getCanvas()->drawPaint(p);
    }
}

DEF_FUZZ(Gradients, fuzz) {
    uint8_t i;
    fuzz->next(&i);

    switch(i) {
        case 0:
            SkDEBUGF("LinearGradient\n");
            fuzzLinearGradient(fuzz);
            return;
        case 1:
            SkDEBUGF("RadialGradient\n");
            fuzzRadialGradient(fuzz);
            return;
        case 2:
            SkDEBUGF("TwoPointConicalGradient\n");
            fuzzTwoPointConicalGradient(fuzz);
            return;
    }
    SkDEBUGF("SweepGradient\n");
    fuzzSweepGradient(fuzz);
    return;
}

Coverage Report

Created: 2024-09-14 07:19

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2016 Google Inc.
3		*
4		* Use of this source code is governed by a BSD-style license that can be
5		* found in the LICENSE file.
6		*/
7
8		#include "fuzz/Fuzz.h"
9		#include "include/core/SkCanvas.h"
10		#include "include/core/SkSurface.h"
11		#include "include/effects/SkGradientShader.h"
12		#include "src/base/SkTLazy.h"
13		#include "src/core/SkDebugUtils.h"
14		#include "tools/flags/CommandLineFlags.h"
15
16		#include <algorithm>
17		#include <vector>
18
19		static DEFINE_bool2(verbose, v, false, "log verbose linear gradient description");
20
21		const int MAX_COUNT = 400;
22
23	453	void makeMatrix(Fuzz* fuzz, SkMatrix* m) {
24	453	SkScalar mat[9];
25	453	fuzz->nextN(mat, 9);
26	453	m->set9(mat);
27	453	}
28
29		void initGradientParams(Fuzz* fuzz, std::vector<SkColor>* colors,
30	877	std::vector<SkScalar>* pos, SkTileMode* mode) {
31	877	int count;
32	877	fuzz->nextRange(&count, 0, MAX_COUNT);
33
34		// Use a uint8_t to conserve bytes. This makes our "fuzzed bytes footprint"
35		// smaller, which leads to more efficient fuzzing.
36	877	uint8_t m;
37	877	fuzz->nextRange(&m, 0, 2);
38	877	*mode = static_cast<SkTileMode>(m);
39
40	877	colors->clear();
41	877	pos ->clear();
42	133k	for (int i = 0; i < count; i++) {
43	132k	SkColor c;
44	132k	SkScalar s;
45	132k	fuzz->next(&c, &s);
46	132k	colors->push_back(c);
47	132k	pos ->push_back(s);
48	132k	}
49	877	if (count) {
50	814	std::sort(pos->begin(), pos->end());
51		// The order matters. If count == 1, we want pos == 0.
52	814	(*pos)[count - 1] = 1;
53	814	(*pos)[0] = 0;
54	814	}
55	877	}
56
57	0	static void logOptionalMatrix(const char* label, const SkMatrix* m) {
58	0	if (!m) {
59	0	return;
60	0	}
61
62	0	SkDEBUGF(" %s: [ ", label);
63	0	for (int i = 0; i < 9; ++i) {
64	0	SkDEBUGF("%.9g ", m->get(i));
65	0	}
66	0	SkDEBUGF("]\n");
67	0	}
68
69		static void logLinearGradient(const SkPoint pts[2],
70		const std::vector<SkColor>& colors,
71		const std::vector<SkScalar>& pos,
72		SkTileMode mode,
73		uint32_t flags,
74		const SkMatrix* localMatrix,
75	125	const SkMatrix* globalMatrix) {
76	125	if (!FLAGS_verbose) {
77	125	return;
78	125	}
79
80	0	SkDebugf("--- fuzzLinearGradient ---\n");
81	0	SkDebugf(" pts:\t\t[ (%.9g %.9g) (%.9g %.9g) ]\n",
82	0	pts[0].x(), pts[0].y(), pts[1].x(), pts[1].y());
83	0	SkDebugf(" colors:\t[ ");
84	0	for (auto color : colors) {
85	0	SkDebugf("0x%x ", color);
86	0	}
87
88	0	SkDebugf("]\n pos:\t\t");
89	0	if (pos.empty()) {
90	0	SkDebugf("nullptr");
91	0	} else {
92	0	SkDebugf("[ ");
93	0	for (auto p : pos) {
94	0	SkDebugf("%f ", p);
95	0	}
96	0	}
97	0	SkDebugf("]\n");
98
99	0	SkDebugf(" mode:\t\t%s\n", SkTileModeToStr(mode));
100	0	SkDebugf(" flags:\t0x%x\n", flags);
101	0	logOptionalMatrix("local matrix", localMatrix);
102	0	logOptionalMatrix("global matrix", globalMatrix);
103	0	}
104
105	125	void fuzzLinearGradient(Fuzz* fuzz) {
106	125	SkPoint pts[2];
107	125	fuzz->next(&pts[0].fX, &pts[0].fY, &pts[1].fX, &pts[1].fY);
108	125	bool useLocalMatrix, useGlobalMatrix;
109	125	fuzz->next(&useLocalMatrix, &useGlobalMatrix);
110
111	125	std::vector<SkColor> colors;
112	125	std::vector<SkScalar> pos;
113	125	SkTileMode mode;
114	125	initGradientParams(fuzz, &colors, &pos, &mode);
115
116	125	SkPaint p;
117	125	uint32_t flags;
118	125	fuzz->next(&flags);
119
120	125	SkTLazy<SkMatrix> localMatrix;
121	125	if (useLocalMatrix) {
122	7	makeMatrix(fuzz, localMatrix.init());
123	7	}
124	125	p.setShader(SkGradientShader::MakeLinear(pts, colors.data(), pos.data(),
125	125	colors.size(), mode, flags, localMatrix.getMaybeNull()));
126
127	125	sk_sp<SkSurface> surface(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(50, 50)));
128	125	if (useGlobalMatrix) {
129	38	SkMatrix gm;
130	38	makeMatrix(fuzz, &gm);
131	38	logLinearGradient(pts, colors, pos, mode, flags, localMatrix.getMaybeNull(), &gm);
132	38	SkCanvas* c = surface->getCanvas();
133	38	c->setMatrix(gm);
134	38	c->drawPaint(p);
135	87	} else {
136	87	logLinearGradient(pts, colors, pos, mode, flags, localMatrix.getMaybeNull(), nullptr);
137	87	surface->getCanvas()->drawPaint(p);
138	87	}
139	125	}
140
141	86	void fuzzRadialGradient(Fuzz* fuzz) {
142	86	SkPoint center;
143	86	fuzz->next(&center.fX, &center.fY);
144	86	SkScalar radius;
145	86	bool useLocalMatrix, useGlobalMatrix;
146	86	fuzz->next(&radius, &useLocalMatrix, &useGlobalMatrix);
147
148
149	86	std::vector<SkColor> colors;
150	86	std::vector<SkScalar> pos;
151	86	SkTileMode mode;
152	86	initGradientParams(fuzz, &colors, &pos, &mode);
153
154	86	SkPaint p;
155	86	uint32_t flags;
156	86	fuzz->next(&flags);
157
158	86	SkTLazy<SkMatrix> localMatrix;
159	86	if (useLocalMatrix) {
160	8	makeMatrix(fuzz, localMatrix.init());
161	8	}
162	86	p.setShader(SkGradientShader::MakeRadial(center, radius, colors.data(),
163	86	pos.data(), colors.size(), mode, flags, localMatrix.getMaybeNull()));
164
165	86	sk_sp<SkSurface> surface(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(50, 50)));
166	86	if (useGlobalMatrix) {
167	19	SkMatrix gm;
168	19	makeMatrix(fuzz, &gm);
169	19	SkCanvas* c = surface->getCanvas();
170	19	c->setMatrix(gm);
171	19	c->drawPaint(p);
172	67	} else {
173	67	surface->getCanvas()->drawPaint(p);
174	67	}
175	86	}
176
177	291	void fuzzTwoPointConicalGradient(Fuzz* fuzz) {
178	291	SkPoint start;
179	291	fuzz->next(&start.fX, &start.fY);
180	291	SkPoint end;
181	291	fuzz->next(&end.fX, &end.fY);
182	291	SkScalar startRadius, endRadius;
183	291	bool useLocalMatrix, useGlobalMatrix;
184	291	fuzz->next(&startRadius, &endRadius, &useLocalMatrix, &useGlobalMatrix);
185
186	291	std::vector<SkColor> colors;
187	291	std::vector<SkScalar> pos;
188	291	SkTileMode mode;
189	291	initGradientParams(fuzz, &colors, &pos, &mode);
190
191	291	SkPaint p;
192	291	uint32_t flags;
193	291	fuzz->next(&flags);
194
195	291	SkTLazy<SkMatrix> localMatrix;
196	291	if (useLocalMatrix) {
197	14	makeMatrix(fuzz, localMatrix.init());
198	14	}
199	291	p.setShader(SkGradientShader::MakeTwoPointConical(start, startRadius,
200	291	end, endRadius, colors.data(), pos.data(), colors.size(), mode,
201	291	flags, localMatrix.getMaybeNull()));
202
203	291	sk_sp<SkSurface> surface(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(50, 50)));
204	291	if (useGlobalMatrix) {
205	72	SkMatrix gm;
206	72	makeMatrix(fuzz, &gm);
207	72	SkCanvas* c = surface->getCanvas();
208	72	c->setMatrix(gm);
209	72	c->drawPaint(p);
210	219	} else {
211	219	surface->getCanvas()->drawPaint(p);
212	219	}
213	291	}
214
215	375	void fuzzSweepGradient(Fuzz* fuzz) {
216	375	SkScalar cx, cy;
217	375	bool useLocalMatrix, useGlobalMatrix;
218	375	fuzz->next(&cx, &cy, &useLocalMatrix, &useGlobalMatrix);
219
220	375	std::vector<SkColor> colors;
221	375	std::vector<SkScalar> pos;
222	375	SkTileMode mode;
223	375	initGradientParams(fuzz, &colors, &pos, &mode);
224
225	375	SkPaint p;
226	375	if (useLocalMatrix) {
227	138	SkMatrix m;
228	138	makeMatrix(fuzz, &m);
229	138	uint32_t flags;
230	138	fuzz->next(&flags);
231
232	138	p.setShader(SkGradientShader::MakeSweep(cx, cy, colors.data(),
233	138	pos.data(), colors.size(), flags, &m));
234	237	} else {
235	237	p.setShader(SkGradientShader::MakeSweep(cx, cy, colors.data(),
236	237	pos.data(), colors.size()));
237	237	}
238
239	375	sk_sp<SkSurface> surface(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(50, 50)));
240	375	if (useGlobalMatrix) {
241	157	SkMatrix gm;
242	157	makeMatrix(fuzz, &gm);
243	157	SkCanvas* c = surface->getCanvas();
244	157	c->setMatrix(gm);
245	157	c->drawPaint(p);
246	218	} else {
247	218	surface->getCanvas()->drawPaint(p);
248	218	}
249	375	}
250
251	877	DEF_FUZZ(Gradients, fuzz) {
252	877	uint8_t i;
253	877	fuzz->next(&i);
254
255	877	switch(i) {
256	125	case 0:
257	125	SkDEBUGF("LinearGradient\n");
258	125	fuzzLinearGradient(fuzz);
259	125	return;
260	86	case 1:
261	86	SkDEBUGF("RadialGradient\n");
262	86	fuzzRadialGradient(fuzz);
263	86	return;
264	291	case 2:
265	291	SkDEBUGF("TwoPointConicalGradient\n");
266	291	fuzzTwoPointConicalGradient(fuzz);
267	291	return;
268	877	}
269	375	SkDEBUGF("SweepGradient\n");
270	375	fuzzSweepGradient(fuzz);
271	375	return;
272	877	}