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skia2/tests/GifTest.cpp
Nigel Tao 3c70f9acfc Add a GifTest for the Haeberli hack 
Bug: skia:8766
Change-Id: I5e6ad0a613a3454bf17fd492f1ab4d7831e59092
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240736
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
2019-09-11 17:55:33 +00:00

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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/codec/SkAndroidCodec.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkData.h"
#include "include/core/SkImage.h"
#include "include/core/SkStream.h"
#include "include/core/SkTypes.h"
#include "tests/CodecPriv.h"
#include "tests/Test.h"
#include "tools/Resources.h"
static unsigned char gGIFData[] = {
0x47, 0x49, 0x46, 0x38, 0x37, 0x61, 0x03, 0x00, 0x03, 0x00, 0xe3, 0x08,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0x00,
0xff, 0x80, 0x80, 0x80, 0x00, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x2c, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x03, 0x00, 0x00, 0x04,
0x07, 0x50, 0x1c, 0x43, 0x40, 0x41, 0x23, 0x44, 0x00, 0x3b
};
static unsigned char gGIFDataNoColormap[] = {
// Header
0x47, 0x49, 0x46, 0x38, 0x39, 0x61,
// Screen descriptor
0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
// Graphics control extension
0x21, 0xf9, 0x04, 0x01, 0x0a, 0x00, 0x01, 0x00,
// Image descriptor
0x2c, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00,
// Image data
0x02, 0x02, 0x4c, 0x01, 0x00,
// Trailer
0x3b
};
static unsigned char gInterlacedGIF[] = {
0x47, 0x49, 0x46, 0x38, 0x37, 0x61, 0x09, 0x00, 0x09, 0x00, 0xe3, 0x08, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0x00, 0xff, 0x80,
0x80, 0x80, 0x00, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x2c, 0x00, 0x00, 0x00,
0x00, 0x09, 0x00, 0x09, 0x00, 0x40, 0x04, 0x1b, 0x50, 0x1c, 0x23, 0xe9, 0x44,
0x23, 0x60, 0x9d, 0x09, 0x28, 0x1e, 0xf8, 0x6d, 0x64, 0x56, 0x9d, 0x53, 0xa8,
0x7e, 0xa8, 0x65, 0x94, 0x5c, 0xb0, 0x8a, 0x45, 0x04, 0x00, 0x3b
};
static void test_gif_data_no_colormap(skiatest::Reporter* r,
void* data,
size_t size) {
SkBitmap bm;
bool imageDecodeSuccess = decode_memory(data, size, &bm);
REPORTER_ASSERT(r, imageDecodeSuccess);
REPORTER_ASSERT(r, bm.width() == 1);
REPORTER_ASSERT(r, bm.height() == 1);
REPORTER_ASSERT(r, !(bm.empty()));
if (!(bm.empty())) {
REPORTER_ASSERT(r, bm.getColor(0, 0) == 0x00000000);
}
}
static void test_gif_data(skiatest::Reporter* r, void* data, size_t size) {
SkBitmap bm;
bool imageDecodeSuccess = decode_memory(data, size, &bm);
REPORTER_ASSERT(r, imageDecodeSuccess);
REPORTER_ASSERT(r, bm.width() == 3);
REPORTER_ASSERT(r, bm.height() == 3);
REPORTER_ASSERT(r, !(bm.empty()));
if (!(bm.empty())) {
REPORTER_ASSERT(r, bm.getColor(0, 0) == 0xffff0000);
REPORTER_ASSERT(r, bm.getColor(1, 0) == 0xffffff00);
REPORTER_ASSERT(r, bm.getColor(2, 0) == 0xff00ffff);
REPORTER_ASSERT(r, bm.getColor(0, 1) == 0xff808080);
REPORTER_ASSERT(r, bm.getColor(1, 1) == 0xff000000);
REPORTER_ASSERT(r, bm.getColor(2, 1) == 0xff00ff00);
REPORTER_ASSERT(r, bm.getColor(0, 2) == 0xffffffff);
REPORTER_ASSERT(r, bm.getColor(1, 2) == 0xffff00ff);
REPORTER_ASSERT(r, bm.getColor(2, 2) == 0xff0000ff);
}
}
static void test_gif_data_dims(skiatest::Reporter* r, void* data, size_t size, int width,
int height) {
SkBitmap bm;
bool imageDecodeSuccess = decode_memory(data, size, &bm);
REPORTER_ASSERT(r, imageDecodeSuccess);
REPORTER_ASSERT(r, bm.width() == width);
REPORTER_ASSERT(r, bm.height() == height);
REPORTER_ASSERT(r, !(bm.empty()));
}
static void test_interlaced_gif_data(skiatest::Reporter* r,
void* data,
size_t size) {
SkBitmap bm;
bool imageDecodeSuccess = decode_memory(data, size, &bm);
REPORTER_ASSERT(r, imageDecodeSuccess);
REPORTER_ASSERT(r, bm.width() == 9);
REPORTER_ASSERT(r, bm.height() == 9);
REPORTER_ASSERT(r, !(bm.empty()));
if (!(bm.empty())) {
REPORTER_ASSERT(r, bm.getColor(0, 0) == 0xffff0000);
REPORTER_ASSERT(r, bm.getColor(1, 0) == 0xffffff00);
REPORTER_ASSERT(r, bm.getColor(2, 0) == 0xff00ffff);
REPORTER_ASSERT(r, bm.getColor(0, 2) == 0xffffffff);
REPORTER_ASSERT(r, bm.getColor(1, 2) == 0xffff00ff);
REPORTER_ASSERT(r, bm.getColor(2, 2) == 0xff0000ff);
REPORTER_ASSERT(r, bm.getColor(0, 4) == 0xff808080);
REPORTER_ASSERT(r, bm.getColor(1, 4) == 0xff000000);
REPORTER_ASSERT(r, bm.getColor(2, 4) == 0xff00ff00);
REPORTER_ASSERT(r, bm.getColor(0, 6) == 0xffff0000);
REPORTER_ASSERT(r, bm.getColor(1, 6) == 0xffffff00);
REPORTER_ASSERT(r, bm.getColor(2, 6) == 0xff00ffff);
REPORTER_ASSERT(r, bm.getColor(0, 8) == 0xffffffff);
REPORTER_ASSERT(r, bm.getColor(1, 8) == 0xffff00ff);
REPORTER_ASSERT(r, bm.getColor(2, 8) == 0xff0000ff);
}
}
static void test_gif_data_short(skiatest::Reporter* r,
void* data,
size_t size) {
SkBitmap bm;
bool imageDecodeSuccess = decode_memory(data, size, &bm);
REPORTER_ASSERT(r, imageDecodeSuccess);
REPORTER_ASSERT(r, bm.width() == 3);
REPORTER_ASSERT(r, bm.height() == 3);
REPORTER_ASSERT(r, !(bm.empty()));
if (!(bm.empty())) {
REPORTER_ASSERT(r, bm.getColor(0, 0) == 0xffff0000);
REPORTER_ASSERT(r, bm.getColor(1, 0) == 0xffffff00);
REPORTER_ASSERT(r, bm.getColor(2, 0) == 0xff00ffff);
REPORTER_ASSERT(r, bm.getColor(0, 1) == 0xff808080);
REPORTER_ASSERT(r, bm.getColor(1, 1) == 0xff000000);
REPORTER_ASSERT(r, bm.getColor(2, 1) == 0xff00ff00);
}
}
/**
This test will test the ability of the SkCodec to deal with
GIF files which have been mangled somehow. We want to display as
much of the GIF as possible.
*/
DEF_TEST(Gif, reporter) {
// test perfectly good images.
test_gif_data(reporter, static_cast<void *>(gGIFData), sizeof(gGIFData));
test_interlaced_gif_data(reporter, static_cast<void *>(gInterlacedGIF),
sizeof(gInterlacedGIF));
unsigned char badData[sizeof(gGIFData)];
memcpy(badData, gGIFData, sizeof(gGIFData));
badData[6] = 0x01; // image too wide
test_gif_data(reporter, static_cast<void *>(badData), sizeof(gGIFData));
// "libgif warning [image too wide, expanding output to size]"
memcpy(badData, gGIFData, sizeof(gGIFData));
badData[8] = 0x01; // image too tall
test_gif_data(reporter, static_cast<void *>(badData), sizeof(gGIFData));
// "libgif warning [image too tall, expanding output to size]"
memcpy(badData, gGIFData, sizeof(gGIFData));
badData[62] = 0x01; // image shifted right
test_gif_data_dims(reporter, static_cast<void *>(badData), sizeof(gGIFData), 4, 3);
memcpy(badData, gGIFData, sizeof(gGIFData));
badData[64] = 0x01; // image shifted down
test_gif_data_dims(reporter, static_cast<void *>(badData), sizeof(gGIFData), 3, 4);
memcpy(badData, gGIFData, sizeof(gGIFData));
badData[62] = 0xff; // image shifted right
badData[63] = 0xff;
test_gif_data_dims(reporter, static_cast<void *>(badData), sizeof(gGIFData), 3 + 0xFFFF, 3);
memcpy(badData, gGIFData, sizeof(gGIFData));
badData[64] = 0xff; // image shifted down
badData[65] = 0xff;
test_gif_data_dims(reporter, static_cast<void *>(badData), sizeof(gGIFData), 3, 3 + 0xFFFF);
test_gif_data_no_colormap(reporter, static_cast<void *>(gGIFDataNoColormap),
sizeof(gGIFDataNoColormap));
#ifdef SK_HAS_WUFFS_LIBRARY
// We are transitioning from an old GIF implementation to a new (Wuffs) GIF
// implementation.
//
// This test (without SK_HAS_WUFFS_LIBRARY) is overly specific to the old
// implementation. It claims that, for invalid (truncated) input, we can
// still 'decode' all of the pixels because no matter what palette index
// each pixel is, they're all equivalently transparent. It's not obvious
// that this off-spec behavior is worth preserving. Are real world users
// decoding truncated all-transparent GIF images??
//
// Once the transition is complete, we can remove the #ifdef and delete the
// #else branch.
#else
// Since there is no color map, we do not even need to parse the image data
// to know that we should draw transparent. Truncate the file before the
// data. This should still succeed.
test_gif_data_no_colormap(reporter, static_cast<void *>(gGIFDataNoColormap), 31);
// Likewise, incremental decoding should succeed here.
{
sk_sp<SkData> data = SkData::MakeWithoutCopy(gGIFDataNoColormap, 31);
std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(data));
REPORTER_ASSERT(reporter, codec);
if (codec) {
auto info = codec->getInfo().makeColorType(kN32_SkColorType);
SkBitmap bm;
bm.allocPixels(info);
REPORTER_ASSERT(reporter, SkCodec::kSuccess == codec->startIncrementalDecode(
info, bm.getPixels(), bm.rowBytes()));
REPORTER_ASSERT(reporter, SkCodec::kSuccess == codec->incrementalDecode());
REPORTER_ASSERT(reporter, bm.width() == 1);
REPORTER_ASSERT(reporter, bm.height() == 1);
REPORTER_ASSERT(reporter, !(bm.empty()));
if (!(bm.empty())) {
REPORTER_ASSERT(reporter, bm.getColor(0, 0) == 0x00000000);
}
}
}
#endif
// test short Gif. 80 is missing a few bytes.
test_gif_data_short(reporter, static_cast<void *>(gGIFData), 80);
// "libgif warning [DGifGetLine]"
test_interlaced_gif_data(reporter, static_cast<void *>(gInterlacedGIF),
100); // 100 is missing a few bytes
// "libgif warning [interlace DGifGetLine]"
}
#ifndef SK_HAS_WUFFS_LIBRARY
DEF_TEST(Codec_GifInterlacedTruncated, r) {
// Check that gInterlacedGIF is exactly 102 bytes long, and that the final
// 30 bytes, in the half-open range [72, 102), consists of 0x1b (indicating
// a block of 27 bytes), then those 27 bytes, then 0x00 (end of the blocks)
// then 0x3b (end of the GIF).
if ((sizeof(gInterlacedGIF) != 102) ||
(gInterlacedGIF[72] != 0x1b) ||
(gInterlacedGIF[100] != 0x00) ||
(gInterlacedGIF[101] != 0x3b)) {
ERRORF(r, "Invalid gInterlacedGIF data");
return;
}
// We want to test the GIF codec's output on some (but not all) of the
// LZW-compressed data. As is, there is only one block of LZW-compressed
// data, 27 bytes long. Some GIF implementations output intermediate rows
// only on block boundaries, so truncating to a prefix of gInterlacedGIF
// isn't enough. We also have to modify the block size down from 0x1b so
// that the edited version still contains a complete block. In this case,
// it's a block of 10 bytes.
unsigned char data[83];
memcpy(data, gInterlacedGIF, sizeof(data));
data[72] = sizeof(data) - 73;
// Just like test_interlaced_gif_data, check that we get a 9x9 image.
SkBitmap bm;
bool imageDecodeSuccess = decode_memory(data, sizeof(data), &bm);
REPORTER_ASSERT(r, imageDecodeSuccess);
REPORTER_ASSERT(r, bm.width() == 9);
REPORTER_ASSERT(r, bm.height() == 9);
// For an interlaced, non-transparent image, we thicken or replicate the
// rows of earlier interlace passes so that, when e.g. decoding a GIF
// sourced from a slow network connection, we show a richer intermediate
// image while waiting for the complete image. This replication is
// sometimes described as a "Haeberli inspired technique".
//
// For a 9 pixel high image, interlacing shuffles the row order to be: 0,
// 8, 4, 2, 6, 1, 3, 5, 7. Even though truncating to 10 bytes of
// LZW-compressed data only explicitly contains completed rows 0 and 8, we
// still expect row 7 to be set, due to replication, and therefore not
// transparent black (zero).
REPORTER_ASSERT(r, bm.getColor(0, 7) != 0);
}
#endif
// Regression test for decoding a gif image with sampleSize of 4, which was
// previously crashing.
DEF_TEST(Gif_Sampled, r) {
auto data = GetResourceAsData("images/test640x479.gif");
REPORTER_ASSERT(r, data);
if (!data) {
return;
}
std::unique_ptr<SkStreamAsset> stream(new SkMemoryStream(std::move(data)));
std::unique_ptr<SkAndroidCodec> codec(SkAndroidCodec::MakeFromStream(std::move(stream)));
REPORTER_ASSERT(r, codec);
if (!codec) {
return;
}
SkAndroidCodec::AndroidOptions options;
options.fSampleSize = 4;
SkBitmap bm;
bm.allocPixels(codec->getInfo());
const SkCodec::Result result = codec->getAndroidPixels(codec->getInfo(), bm.getPixels(),
bm.rowBytes(), &options);
REPORTER_ASSERT(r, result == SkCodec::kSuccess);
}
// If a GIF file is truncated before the header for the first image is defined,
// we should not create an SkCodec.
DEF_TEST(Codec_GifTruncated, r) {
sk_sp<SkData> data(GetResourceAsData("images/test640x479.gif"));
if (!data) {
return;
}
// This is right before the header for the first image.
data = SkData::MakeSubset(data.get(), 0, 446);
std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(data));
REPORTER_ASSERT(r, !codec);
}
/*
For the Codec_GifTruncated2 test, immediately below,
resources/images/box.gif's first 23 bytes are:
00000000: 4749 4638 3961 c800 3700 203f 002c 0000 GIF89a..7. ?.,..
00000010: 0000 c800 3700 85 ....7..
The breakdown:
@000 6 bytes magic "GIF89a"
@006 7 bytes Logical Screen Descriptor: 0xC8 0x00 ... 0x00
- width = 200
- height = 55
- flags = 0x20
- background color index, pixel aspect ratio bytes ignored
@00D 10 bytes Image Descriptor header: 0x2C 0x00 ... 0x85
- origin_x = 0
- origin_y = 0
- width = 200
- height = 55
- flags = 0x85, local color table, 64 RGB entries
In particular, 23 bytes is after the header, but before the color table.
*/
DEF_TEST(Codec_GifTruncated2, r) {
// Truncate box.gif at 21, 22 and 23 bytes.
//
// See also Codec_GifTruncated3 in this file, below.
//
// See also Codec_trunc in CodecAnimTest.cpp for this magic 23.
//
// See also Codec_GifPreMap in CodecPartialTest.cpp for this magic 23.
for (int i = 21; i < 24; i++) {
sk_sp<SkData> data(GetResourceAsData("images/box.gif"));
if (!data) {
return;
}
data = SkData::MakeSubset(data.get(), 0, i);
std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(data));
if (i <= 21) {
if (codec) {
ERRORF(r, "Invalid data gave non-nullptr codec");
}
return;
}
if (!codec) {
ERRORF(r, "Failed to create codec with partial data (truncated at %d)", i);
return;
}
#ifdef SK_HAS_WUFFS_LIBRARY
// We are transitioning from an old GIF implementation to a new (Wuffs)
// GIF implementation.
//
// The input is truncated in the Image Descriptor, before the local
// color table, and before (21) or after (22, 23) the first frame's
// XYWH (left / top / width / height) can be decoded. A detailed
// breakdown of those 23 bytes is in a comment above this function.
//
// With the old implementation, this test claimed that "no frame is
// complete enough that it has its metadata". In terms of the
// underlying file format, this claim is true for truncating at 21
// bytes, but not true for 22 or 23.
//
// At 21 bytes, both the old and new implementation's MakeFromStream
// factory method returns a nullptr SkCodec*, because creating a
// SkCodec requires knowing the image width and height (as its
// constructor takes an SkEncodedInfo argument), and specifically for
// GIF, decoding the image width and height requires decoding the first
// frame's XYWH, as per
// https://raw.githubusercontent.com/google/wuffs/master/test/data/artificial/gif-frame-out-of-bounds.gif.make-artificial.txt
//
// At 22 or 23 bytes, the first frame is complete enough that we can
// fill in all of a SkCodec::FrameInfo's fields (other than
// fFullyReceived). Specifically, we can fill in fRequiredFrame and
// fAlphaType, even though we haven't yet decoded the frame's RGB
// palette entries, as we do know the frame rectangle and that every
// palette entry is fully opaque, due to the lack of a Graphic Control
// Extension before the Image Descriptor.
//
// The new implementation correctly reports that the first frame's
// metadata is complete enough. The old implementation does not.
//
// Once the transition is complete, we can remove the #ifdef and delete
// the #else code.
REPORTER_ASSERT(r, codec->getFrameCount() == 1);
#else
// The old implementation claimed:
//
// Although we correctly created a codec, no frame is
// complete enough that it has its metadata. Returning 0
// ensures that Chromium will not try to create a frame
// too early.
REPORTER_ASSERT(r, codec->getFrameCount() == 0);
#endif
}
}
#ifdef SK_HAS_WUFFS_LIBRARY
// This tests that, after truncating the input, the pixels are still
// zero-initialized. If you comment out the SkSampler::Fill call in
// SkWuffsCodec::onStartIncrementalDecode, the test could still pass (in a
// standard configuration) but should fail with the MSAN memory sanitizer.
DEF_TEST(Codec_GifTruncated3, r) {
sk_sp<SkData> data(GetResourceAsData("images/box.gif"));
if (!data) {
return;
}
data = SkData::MakeSubset(data.get(), 0, 23);
sk_sp<SkImage> image(SkImage::MakeFromEncoded(data));
if (!image) {
ERRORF(r, "Missing image");
return;
}
REPORTER_ASSERT(r, image->width() == 200);
REPORTER_ASSERT(r, image->height() == 55);
SkBitmap bm;
if (!bm.tryAllocPixels(SkImageInfo::MakeN32Premul(200, 55))) {
ERRORF(r, "Failed to allocate pixels");
return;
}
bm.eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(bm);
canvas.drawImage(image, 0, 0, nullptr);
for (int i = 0; i < image->width(); ++i)
for (int j = 0; j < image->height(); ++j) {
SkColor actual = SkUnPreMultiply::PMColorToColor(*bm.getAddr32(i, j));
if (actual != SK_ColorTRANSPARENT) {
ERRORF(r, "did not initialize pixels! %i, %i is %x", i, j, actual);
}
}
}
#endif
DEF_TEST(Codec_gif_out_of_palette, r) {
if (GetResourcePath().isEmpty()) {
return;
}
const char* path = "images/out-of-palette.gif";
auto data = GetResourceAsData(path);
if (!data) {
ERRORF(r, "failed to find %s", path);
return;
}
auto codec = SkCodec::MakeFromData(std::move(data));
if (!codec) {
ERRORF(r, "Could not create codec from %s", path);
return;
}
SkBitmap bm;
bm.allocPixels(codec->getInfo());
auto result = codec->getPixels(bm.pixmap());
REPORTER_ASSERT(r, result == SkCodec::kSuccess, "Failed to decode %s with error %s",
path, SkCodec::ResultToString(result));
struct {
int x;
int y;
SkColor expected;
} pixels[] = {
{ 0, 0, SK_ColorBLACK },
{ 1, 0, SK_ColorWHITE },
{ 0, 1, SK_ColorTRANSPARENT },
{ 1, 1, SK_ColorTRANSPARENT },
};
for (auto& pixel : pixels) {
auto actual = bm.getColor(pixel.x, pixel.y);
REPORTER_ASSERT(r, actual == pixel.expected,
"pixel (%i,%i) mismatch! expected: %x actual: %x",
pixel.x, pixel.y, pixel.expected, actual);
}
}
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