/*
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* Copyright 2013 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 "CodecPriv.h"
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#include "Resources.h"
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#include "SkAndroidCodec.h"
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#include "SkBitmap.h"
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#include "SkCanvas.h"
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#include "SkData.h"
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#include "SkImage.h"
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#include "SkStream.h"
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#include "SkTypes.h"
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#include "Test.h"
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static unsigned char gGIFData[] = {
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0x47, 0x49, 0x46, 0x38, 0x37, 0x61, 0x03, 0x00, 0x03, 0x00, 0xe3, 0x08,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0x00,
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0xff, 0x80, 0x80, 0x80, 0x00, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x2c, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x03, 0x00, 0x00, 0x04,
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0x07, 0x50, 0x1c, 0x43, 0x40, 0x41, 0x23, 0x44, 0x00, 0x3b
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};
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static unsigned char gGIFDataNoColormap[] = {
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// Header
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0x47, 0x49, 0x46, 0x38, 0x39, 0x61,
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// Screen descriptor
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0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
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// Graphics control extension
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0x21, 0xf9, 0x04, 0x01, 0x0a, 0x00, 0x01, 0x00,
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// Image descriptor
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0x2c, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00,
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// Image data
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0x02, 0x02, 0x4c, 0x01, 0x00,
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// Trailer
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0x3b
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};
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static unsigned char gInterlacedGIF[] = {
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0x47, 0x49, 0x46, 0x38, 0x37, 0x61, 0x09, 0x00, 0x09, 0x00, 0xe3, 0x08, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0x00, 0xff, 0x80,
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0x80, 0x80, 0x00, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x2c, 0x00, 0x00, 0x00,
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0x00, 0x09, 0x00, 0x09, 0x00, 0x40, 0x04, 0x1b, 0x50, 0x1c, 0x23, 0xe9, 0x44,
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0x23, 0x60, 0x9d, 0x09, 0x28, 0x1e, 0xf8, 0x6d, 0x64, 0x56, 0x9d, 0x53, 0xa8,
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0x7e, 0xa8, 0x65, 0x94, 0x5c, 0xb0, 0x8a, 0x45, 0x04, 0x00, 0x3b
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};
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static void test_gif_data_no_colormap(skiatest::Reporter* r,
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void* data,
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size_t size) {
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SkBitmap bm;
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bool imageDecodeSuccess = decode_memory(data, size, &bm);
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REPORTER_ASSERT(r, imageDecodeSuccess);
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REPORTER_ASSERT(r, bm.width() == 1);
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REPORTER_ASSERT(r, bm.height() == 1);
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REPORTER_ASSERT(r, !(bm.empty()));
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if (!(bm.empty())) {
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REPORTER_ASSERT(r, bm.getColor(0, 0) == 0x00000000);
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}
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}
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static void test_gif_data(skiatest::Reporter* r, void* data, size_t size) {
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SkBitmap bm;
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bool imageDecodeSuccess = decode_memory(data, size, &bm);
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REPORTER_ASSERT(r, imageDecodeSuccess);
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REPORTER_ASSERT(r, bm.width() == 3);
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REPORTER_ASSERT(r, bm.height() == 3);
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REPORTER_ASSERT(r, !(bm.empty()));
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if (!(bm.empty())) {
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REPORTER_ASSERT(r, bm.getColor(0, 0) == 0xffff0000);
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REPORTER_ASSERT(r, bm.getColor(1, 0) == 0xffffff00);
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REPORTER_ASSERT(r, bm.getColor(2, 0) == 0xff00ffff);
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REPORTER_ASSERT(r, bm.getColor(0, 1) == 0xff808080);
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REPORTER_ASSERT(r, bm.getColor(1, 1) == 0xff000000);
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REPORTER_ASSERT(r, bm.getColor(2, 1) == 0xff00ff00);
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REPORTER_ASSERT(r, bm.getColor(0, 2) == 0xffffffff);
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REPORTER_ASSERT(r, bm.getColor(1, 2) == 0xffff00ff);
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REPORTER_ASSERT(r, bm.getColor(2, 2) == 0xff0000ff);
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}
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}
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static void test_gif_data_dims(skiatest::Reporter* r, void* data, size_t size, int width,
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int height) {
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SkBitmap bm;
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bool imageDecodeSuccess = decode_memory(data, size, &bm);
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REPORTER_ASSERT(r, imageDecodeSuccess);
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REPORTER_ASSERT(r, bm.width() == width);
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REPORTER_ASSERT(r, bm.height() == height);
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REPORTER_ASSERT(r, !(bm.empty()));
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}
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static void test_interlaced_gif_data(skiatest::Reporter* r,
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void* data,
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size_t size) {
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SkBitmap bm;
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bool imageDecodeSuccess = decode_memory(data, size, &bm);
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REPORTER_ASSERT(r, imageDecodeSuccess);
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REPORTER_ASSERT(r, bm.width() == 9);
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REPORTER_ASSERT(r, bm.height() == 9);
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REPORTER_ASSERT(r, !(bm.empty()));
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if (!(bm.empty())) {
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REPORTER_ASSERT(r, bm.getColor(0, 0) == 0xffff0000);
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REPORTER_ASSERT(r, bm.getColor(1, 0) == 0xffffff00);
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REPORTER_ASSERT(r, bm.getColor(2, 0) == 0xff00ffff);
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REPORTER_ASSERT(r, bm.getColor(0, 2) == 0xffffffff);
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REPORTER_ASSERT(r, bm.getColor(1, 2) == 0xffff00ff);
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REPORTER_ASSERT(r, bm.getColor(2, 2) == 0xff0000ff);
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REPORTER_ASSERT(r, bm.getColor(0, 4) == 0xff808080);
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REPORTER_ASSERT(r, bm.getColor(1, 4) == 0xff000000);
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REPORTER_ASSERT(r, bm.getColor(2, 4) == 0xff00ff00);
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REPORTER_ASSERT(r, bm.getColor(0, 6) == 0xffff0000);
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REPORTER_ASSERT(r, bm.getColor(1, 6) == 0xffffff00);
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REPORTER_ASSERT(r, bm.getColor(2, 6) == 0xff00ffff);
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REPORTER_ASSERT(r, bm.getColor(0, 8) == 0xffffffff);
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REPORTER_ASSERT(r, bm.getColor(1, 8) == 0xffff00ff);
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REPORTER_ASSERT(r, bm.getColor(2, 8) == 0xff0000ff);
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}
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}
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static void test_gif_data_short(skiatest::Reporter* r,
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void* data,
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size_t size) {
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SkBitmap bm;
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bool imageDecodeSuccess = decode_memory(data, size, &bm);
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REPORTER_ASSERT(r, imageDecodeSuccess);
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REPORTER_ASSERT(r, bm.width() == 3);
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REPORTER_ASSERT(r, bm.height() == 3);
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REPORTER_ASSERT(r, !(bm.empty()));
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if (!(bm.empty())) {
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REPORTER_ASSERT(r, bm.getColor(0, 0) == 0xffff0000);
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REPORTER_ASSERT(r, bm.getColor(1, 0) == 0xffffff00);
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REPORTER_ASSERT(r, bm.getColor(2, 0) == 0xff00ffff);
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REPORTER_ASSERT(r, bm.getColor(0, 1) == 0xff808080);
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REPORTER_ASSERT(r, bm.getColor(1, 1) == 0xff000000);
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REPORTER_ASSERT(r, bm.getColor(2, 1) == 0xff00ff00);
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}
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}
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/**
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This test will test the ability of the SkCodec to deal with
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GIF files which have been mangled somehow. We want to display as
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much of the GIF as possible.
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*/
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DEF_TEST(Gif, reporter) {
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// test perfectly good images.
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test_gif_data(reporter, static_cast<void *>(gGIFData), sizeof(gGIFData));
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test_interlaced_gif_data(reporter, static_cast<void *>(gInterlacedGIF),
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sizeof(gInterlacedGIF));
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unsigned char badData[sizeof(gGIFData)];
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memcpy(badData, gGIFData, sizeof(gGIFData));
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badData[6] = 0x01; // image too wide
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test_gif_data(reporter, static_cast<void *>(badData), sizeof(gGIFData));
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// "libgif warning [image too wide, expanding output to size]"
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memcpy(badData, gGIFData, sizeof(gGIFData));
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badData[8] = 0x01; // image too tall
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test_gif_data(reporter, static_cast<void *>(badData), sizeof(gGIFData));
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// "libgif warning [image too tall, expanding output to size]"
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memcpy(badData, gGIFData, sizeof(gGIFData));
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badData[62] = 0x01; // image shifted right
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test_gif_data_dims(reporter, static_cast<void *>(badData), sizeof(gGIFData), 4, 3);
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memcpy(badData, gGIFData, sizeof(gGIFData));
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badData[64] = 0x01; // image shifted down
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test_gif_data_dims(reporter, static_cast<void *>(badData), sizeof(gGIFData), 3, 4);
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memcpy(badData, gGIFData, sizeof(gGIFData));
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badData[62] = 0xff; // image shifted right
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badData[63] = 0xff;
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test_gif_data_dims(reporter, static_cast<void *>(badData), sizeof(gGIFData), 3 + 0xFFFF, 3);
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memcpy(badData, gGIFData, sizeof(gGIFData));
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badData[64] = 0xff; // image shifted down
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badData[65] = 0xff;
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test_gif_data_dims(reporter, static_cast<void *>(badData), sizeof(gGIFData), 3, 3 + 0xFFFF);
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test_gif_data_no_colormap(reporter, static_cast<void *>(gGIFDataNoColormap),
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sizeof(gGIFDataNoColormap));
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#ifdef SK_HAS_WUFFS_LIBRARY
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// We are transitioning from an old GIF implementation to a new (Wuffs) GIF
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// implementation.
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//
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// This test (without SK_HAS_WUFFS_LIBRARY) is overly specific to the old
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// implementation. It claims that, for invalid (truncated) input, we can
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// still 'decode' all of the pixels because no matter what palette index
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// each pixel is, they're all equivalently transparent. It's not obvious
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// that this off-spec behavior is worth preserving. Are real world users
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// decoding truncated all-transparent GIF images??
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//
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// Once the transition is complete, we can remove the #ifdef and delete the
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// #else branch.
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#else
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// Since there is no color map, we do not even need to parse the image data
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// to know that we should draw transparent. Truncate the file before the
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// data. This should still succeed.
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test_gif_data_no_colormap(reporter, static_cast<void *>(gGIFDataNoColormap), 31);
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// Likewise, incremental decoding should succeed here.
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{
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sk_sp<SkData> data = SkData::MakeWithoutCopy(gGIFDataNoColormap, 31);
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std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(data));
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REPORTER_ASSERT(reporter, codec);
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if (codec) {
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auto info = codec->getInfo().makeColorType(kN32_SkColorType);
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SkBitmap bm;
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bm.allocPixels(info);
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REPORTER_ASSERT(reporter, SkCodec::kSuccess == codec->startIncrementalDecode(
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info, bm.getPixels(), bm.rowBytes()));
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REPORTER_ASSERT(reporter, SkCodec::kSuccess == codec->incrementalDecode());
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REPORTER_ASSERT(reporter, bm.width() == 1);
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REPORTER_ASSERT(reporter, bm.height() == 1);
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REPORTER_ASSERT(reporter, !(bm.empty()));
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if (!(bm.empty())) {
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REPORTER_ASSERT(reporter, bm.getColor(0, 0) == 0x00000000);
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}
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}
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}
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#endif
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// test short Gif. 80 is missing a few bytes.
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test_gif_data_short(reporter, static_cast<void *>(gGIFData), 80);
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// "libgif warning [DGifGetLine]"
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test_interlaced_gif_data(reporter, static_cast<void *>(gInterlacedGIF),
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100); // 100 is missing a few bytes
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// "libgif warning [interlace DGifGetLine]"
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}
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// Regression test for decoding a gif image with sampleSize of 4, which was
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// previously crashing.
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DEF_TEST(Gif_Sampled, r) {
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auto data = GetResourceAsData("images/test640x479.gif");
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REPORTER_ASSERT(r, data);
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if (!data) {
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return;
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}
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std::unique_ptr<SkStreamAsset> stream(new SkMemoryStream(std::move(data)));
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std::unique_ptr<SkAndroidCodec> codec(SkAndroidCodec::MakeFromStream(std::move(stream)));
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REPORTER_ASSERT(r, codec);
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if (!codec) {
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return;
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}
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SkAndroidCodec::AndroidOptions options;
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options.fSampleSize = 4;
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SkBitmap bm;
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bm.allocPixels(codec->getInfo());
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const SkCodec::Result result = codec->getAndroidPixels(codec->getInfo(), bm.getPixels(),
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bm.rowBytes(), &options);
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REPORTER_ASSERT(r, result == SkCodec::kSuccess);
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}
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// If a GIF file is truncated before the header for the first image is defined,
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// we should not create an SkCodec.
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DEF_TEST(Codec_GifTruncated, r) {
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sk_sp<SkData> data(GetResourceAsData("images/test640x479.gif"));
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if (!data) {
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return;
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}
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// This is right before the header for the first image.
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data = SkData::MakeSubset(data.get(), 0, 446);
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std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(data));
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REPORTER_ASSERT(r, !codec);
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}
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/*
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For the Codec_GifTruncated2 test, immediately below,
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resources/images/box.gif's first 23 bytes are:
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00000000: 4749 4638 3961 c800 3700 203f 002c 0000 GIF89a..7. ?.,..
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00000010: 0000 c800 3700 85 ....7..
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The breakdown:
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@000 6 bytes magic "GIF89a"
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@006 7 bytes Logical Screen Descriptor: 0xC8 0x00 ... 0x00
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- width = 200
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- height = 55
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- flags = 0x20
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- background color index, pixel aspect ratio bytes ignored
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@00D 10 bytes Image Descriptor header: 0x2C 0x00 ... 0x85
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- origin_x = 0
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- origin_y = 0
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- width = 200
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- height = 55
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- flags = 0x85, local color table, 64 RGB entries
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In particular, 23 bytes is after the header, but before the color table.
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*/
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DEF_TEST(Codec_GifTruncated2, r) {
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// Truncate box.gif at 21, 22 and 23 bytes.
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//
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// See also Codec_GifTruncated3 in this file, below.
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//
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// See also Codec_trunc in CodecAnimTest.cpp for this magic 23.
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//
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// See also Codec_GifPreMap in CodecPartialTest.cpp for this magic 23.
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for (int i = 21; i < 24; i++) {
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sk_sp<SkData> data(GetResourceAsData("images/box.gif"));
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if (!data) {
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return;
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}
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data = SkData::MakeSubset(data.get(), 0, i);
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std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(data));
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if (i <= 21) {
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if (codec) {
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ERRORF(r, "Invalid data gave non-nullptr codec");
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}
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return;
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}
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if (!codec) {
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ERRORF(r, "Failed to create codec with partial data (truncated at %d)", i);
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return;
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}
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#ifdef SK_HAS_WUFFS_LIBRARY
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// We are transitioning from an old GIF implementation to a new (Wuffs)
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// GIF implementation.
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//
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// The input is truncated in the Image Descriptor, before the local
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// color table, and before (21) or after (22, 23) the first frame's
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// XYWH (left / top / width / height) can be decoded. A detailed
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// breakdown of those 23 bytes is in a comment above this function.
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//
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// With the old implementation, this test claimed that "no frame is
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// complete enough that it has its metadata". In terms of the
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// underlying file format, this claim is true for truncating at 21
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// bytes, but not true for 22 or 23.
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//
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// At 21 bytes, both the old and new implementation's MakeFromStream
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// factory method returns a nullptr SkCodec*, because creating a
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// SkCodec requires knowing the image width and height (as its
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// constructor takes an SkEncodedInfo argument), and specifically for
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// GIF, decoding the image width and height requires decoding the first
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// frame's XYWH, as per
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// https://raw.githubusercontent.com/google/wuffs/master/test/data/artificial/gif-frame-out-of-bounds.gif.make-artificial.txt
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//
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// At 22 or 23 bytes, the first frame is complete enough that we can
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// fill in all of a SkCodec::FrameInfo's fields (other than
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// fFullyReceived). Specifically, we can fill in fRequiredFrame and
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// fAlphaType, even though we haven't yet decoded the frame's RGB
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// palette entries, as we do know the frame rectangle and that every
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// palette entry is fully opaque, due to the lack of a Graphic Control
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// Extension before the Image Descriptor.
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//
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// The new implementation correctly reports that the first frame's
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// metadata is complete enough. The old implementation does not.
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//
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// Once the transition is complete, we can remove the #ifdef and delete
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// the #else code.
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REPORTER_ASSERT(r, codec->getFrameCount() == 1);
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#else
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// The old implementation claimed:
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//
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// Although we correctly created a codec, no frame is
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// complete enough that it has its metadata. Returning 0
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// ensures that Chromium will not try to create a frame
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// too early.
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REPORTER_ASSERT(r, codec->getFrameCount() == 0);
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#endif
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}
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}
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#ifdef SK_HAS_WUFFS_LIBRARY
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// This tests that, after truncating the input, the pixels are still
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// zero-initialized. If you comment out the SkSampler::Fill call in
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// SkWuffsCodec::onStartIncrementalDecode, the test could still pass (in a
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// standard configuration) but should fail with the MSAN memory sanitizer.
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DEF_TEST(Codec_GifTruncated3, r) {
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sk_sp<SkData> data(GetResourceAsData("images/box.gif"));
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if (!data) {
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return;
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}
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data = SkData::MakeSubset(data.get(), 0, 23);
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sk_sp<SkImage> image(SkImage::MakeFromEncoded(data));
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if (!image) {
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ERRORF(r, "Missing image");
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return;
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}
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REPORTER_ASSERT(r, image->width() == 200);
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REPORTER_ASSERT(r, image->height() == 55);
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SkBitmap bm;
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if (!bm.tryAllocPixels(SkImageInfo::MakeN32Premul(200, 55))) {
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ERRORF(r, "Failed to allocate pixels");
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return;
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}
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bm.eraseColor(SK_ColorTRANSPARENT);
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SkCanvas canvas(bm);
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canvas.drawImage(image, 0, 0, nullptr);
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for (int i = 0; i < image->width(); ++i)
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for (int j = 0; j < image->height(); ++j) {
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SkColor actual = SkUnPreMultiply::PMColorToColor(*bm.getAddr32(i, j));
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if (actual != SK_ColorTRANSPARENT) {
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ERRORF(r, "did not initialize pixels! %i, %i is %x", i, j, actual);
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}
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}
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}
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#endif
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DEF_TEST(Codec_gif_out_of_palette, r) {
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if (GetResourcePath().isEmpty()) {
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return;
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}
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const char* path = "images/out-of-palette.gif";
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auto data = GetResourceAsData(path);
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if (!data) {
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ERRORF(r, "failed to find %s", path);
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return;
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}
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auto codec = SkCodec::MakeFromData(std::move(data));
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if (!codec) {
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ERRORF(r, "Could not create codec from %s", path);
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return;
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}
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SkBitmap bm;
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bm.allocPixels(codec->getInfo());
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auto result = codec->getPixels(bm.pixmap());
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REPORTER_ASSERT(r, result == SkCodec::kSuccess, "Failed to decode %s with error %s",
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path, SkCodec::ResultToString(result));
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struct {
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int x;
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int y;
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SkColor expected;
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} pixels[] = {
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{ 0, 0, SK_ColorBLACK },
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{ 1, 0, SK_ColorWHITE },
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{ 0, 1, SK_ColorTRANSPARENT },
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{ 1, 1, SK_ColorTRANSPARENT },
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};
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for (auto& pixel : pixels) {
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auto actual = bm.getColor(pixel.x, pixel.y);
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REPORTER_ASSERT(r, actual == pixel.expected,
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"pixel (%i,%i) mismatch! expected: %x actual: %x",
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pixel.x, pixel.y, pixel.expected, actual);
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}
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}
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