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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "skdiff.h"
#include "skdiff_utils.h"
#include "sk_tool_utils.h"
#include "SkBitmap.h"
#include "SkCodec.h"
#include "SkData.h"
#include "SkImageEncoder.h"
#include "SkStream.h"
#include "SkTypes.h"
#include <memory>
bool are_buffers_equal(SkData* skdata1, SkData* skdata2) {
if ((nullptr == skdata1) || (nullptr == skdata2)) {
return false;
}
if (skdata1->size() != skdata2->size()) {
return false;
}
return (0 == memcmp(skdata1->data(), skdata2->data(), skdata1->size()));
}
sk_sp<SkData> read_file(const char* file_path) {
sk_sp<SkData> data(SkData::MakeFromFileName(file_path));
if (!data) {
SkDebugf("WARNING: could not open file <%s> for reading\n", file_path);
}
return data;
}
bool get_bitmap(sk_sp<SkData> fileBits, DiffResource& resource, bool sizeOnly,
bool ignoreColorSpace) {
auto codec = SkCodec::MakeFromData(fileBits);
if (!codec) {
SkDebugf("ERROR: could not create codec for <%s>\n", resource.fFullPath.c_str());
resource.fStatus = DiffResource::kCouldNotDecode_Status;
return false;
}
// If we're "ignoring" color space, then we want the raw pixel values from each image, so we
// decode to the original color space. If we want to account for color spaces, then we want to
// decode each image to the same color space, so that colors that are the "same" (but encoded
// differently) are transformed to some canonical representation prior to comparison.
//
// TODO: Use something wider than sRGB to avoid clipping with out-of-gamut colors.
SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
if (!ignoreColorSpace) {
info = info.makeColorSpace(SkColorSpace::MakeSRGB());
}
if (!resource.fBitmap.setInfo(info.makeColorType(kN32_SkColorType))) {
SkDebugf("ERROR: could not set bitmap info for <%s>\n", resource.fFullPath.c_str());
resource.fStatus = DiffResource::kCouldNotDecode_Status;
return false;
}
if (sizeOnly) {
return true;
}
if (!resource.fBitmap.tryAllocPixels()) {
SkDebugf("ERROR: could not allocate pixels for <%s>\n", resource.fFullPath.c_str());
resource.fStatus = DiffResource::kCouldNotDecode_Status;
return false;
}
if (SkCodec::kSuccess != codec->getPixels(resource.fBitmap.info(),
resource.fBitmap.getPixels(), resource.fBitmap.rowBytes())) {
SkDebugf("ERROR: codec failed for basePath <%s>\n", resource.fFullPath.c_str());
resource.fStatus = DiffResource::kCouldNotDecode_Status;
return false;
}
resource.fStatus = DiffResource::kDecoded_Status;
return true;
}
/** Thanks to PNG, we need to force all pixels 100% opaque. */
static void force_all_opaque(const SkBitmap& bitmap) {
for (int y = 0; y < bitmap.height(); y++) {
for (int x = 0; x < bitmap.width(); x++) {
*bitmap.getAddr32(x, y) |= (SK_A32_MASK << SK_A32_SHIFT);
}
}
}
bool write_bitmap(const SkString& path, const SkBitmap& bitmap) {
SkBitmap copy;
sk_tool_utils::copy_to(©, kN32_SkColorType, bitmap);
force_all_opaque(copy);
return sk_tool_utils::EncodeImageToFile(path.c_str(), copy,
SkEncodedImageFormat::kPNG, 100);
}
/// Return a copy of the "input" string, within which we have replaced all instances
/// of oldSubstring with newSubstring.
///
/// TODO: If we like this, we should move it into the core SkString implementation,
/// adding more checks and ample test cases, and paying more attention to efficiency.
static SkString replace_all(const SkString &input,
const char oldSubstring[], const char newSubstring[]) {
SkString output;
const char *input_cstr = input.c_str();
const char *first_char = input_cstr;
const char *match_char;
size_t oldSubstringLen = strlen(oldSubstring);
while ((match_char = strstr(first_char, oldSubstring))) {
output.append(first_char, (match_char - first_char));
output.append(newSubstring);
first_char = match_char + oldSubstringLen;
}
output.append(first_char);
return output;
}
static SkString filename_to_derived_filename(const SkString& filename, const char *suffix) {
SkString diffName (filename);
const char* cstring = diffName.c_str();
size_t dotOffset = strrchr(cstring, '.') - cstring;
diffName.remove(dotOffset, diffName.size() - dotOffset);
diffName.append(suffix);
// In case we recursed into subdirectories, replace slashes with something else
// so the diffs will all be written into a single flat directory.
diffName = replace_all(diffName, PATH_DIV_STR, "_");
return diffName;
}
SkString filename_to_diff_filename(const SkString& filename) {
return filename_to_derived_filename(filename, "-diff.png");
}
SkString filename_to_white_filename(const SkString& filename) {
return filename_to_derived_filename(filename, "-white.png");
}
void create_and_write_diff_image(DiffRecord* drp,
DiffMetricProc dmp,
const int colorThreshold,
const SkString& outputDir,
const SkString& filename) {
const int w = drp->fBase.fBitmap.width();
const int h = drp->fBase.fBitmap.height();
if (w != drp->fComparison.fBitmap.width() || h != drp->fComparison.fBitmap.height()) {
drp->fResult = DiffRecord::kDifferentSizes_Result;
} else {
drp->fDifference.fBitmap.allocN32Pixels(w, h);
drp->fWhite.fBitmap.allocN32Pixels(w, h);
SkASSERT(DiffRecord::kUnknown_Result == drp->fResult);
compute_diff(drp, dmp, colorThreshold);
SkASSERT(DiffRecord::kUnknown_Result != drp->fResult);
}
if (outputDir.isEmpty()) {
drp->fDifference.fStatus = DiffResource::kUnspecified_Status;
drp->fWhite.fStatus = DiffResource::kUnspecified_Status;
} else {
drp->fDifference.fFilename = filename_to_diff_filename(filename);
drp->fDifference.fFullPath = outputDir;
drp->fDifference.fFullPath.append(drp->fDifference.fFilename);
drp->fDifference.fStatus = DiffResource::kSpecified_Status;
drp->fWhite.fFilename = filename_to_white_filename(filename);
drp->fWhite.fFullPath = outputDir;
drp->fWhite.fFullPath.append(drp->fWhite.fFilename);
drp->fWhite.fStatus = DiffResource::kSpecified_Status;
if (DiffRecord::kDifferentPixels_Result == drp->fResult) {
if (write_bitmap(drp->fDifference.fFullPath, drp->fDifference.fBitmap)) {
drp->fDifference.fStatus = DiffResource::kExists_Status;
} else {
drp->fDifference.fStatus = DiffResource::kDoesNotExist_Status;
}
if (write_bitmap(drp->fWhite.fFullPath, drp->fWhite.fBitmap)) {
drp->fWhite.fStatus = DiffResource::kExists_Status;
} else {
drp->fWhite.fStatus = DiffResource::kDoesNotExist_Status;
}
}
}
}
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