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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/headless/test/bitmap_utils.h"
#include <cstdlib>
#include "base/logging.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
namespace headless {
namespace {
constexpr int kColorChannelTolerance = 2;
bool IsDifferentColorChannel(U8CPU channel, U8CPU base_channel) {
if (channel == base_channel) {
return false;
}
int diff = static_cast<int>(channel) - static_cast<int>(base_channel);
return std::abs(diff) > kColorChannelTolerance;
}
bool IsDifferentColor(SkColor color, SkColor base_color) {
if (color == base_color) {
return false;
}
return IsDifferentColorChannel(SkColorGetA(base_color), SkColorGetA(color)) ||
IsDifferentColorChannel(SkColorGetR(base_color), SkColorGetR(color)) ||
IsDifferentColorChannel(SkColorGetG(base_color), SkColorGetG(color)) ||
IsDifferentColorChannel(SkColorGetB(base_color), SkColorGetB(color));
}
} // namespace
bool CheckColoredRect(const SkBitmap& bitmap,
SkColor rect_color,
SkColor bkgr_color,
int margins) {
gfx::Rect body(bitmap.width(), bitmap.height());
if (margins) {
body.Inset(margins);
}
// Build color rectangle by including every pixel with the specified
// rectangle color into a rectangle.
gfx::Rect rect;
for (int y = body.y(); y < body.bottom(); y++) {
for (int x = body.x(); x < body.right(); x++) {
SkColor color = bitmap.getColor(x, y);
if (color == rect_color) {
gfx::Rect pixel_rect(x, y, 1, 1);
if (rect.IsEmpty()) {
rect = pixel_rect;
} else {
rect.Union(pixel_rect);
}
}
}
}
if (rect.IsEmpty()) {
LOG(ERROR) << "Empty color rectangle, body=" << body.ToString();
return false;
}
// Calculate rectangle to accommodate for pixel anti aliasing.
gfx::Rect anti_aliasing_rect = rect;
anti_aliasing_rect.Outset(1);
// Verify that all pixels outside the found color rectangle are of
// the specified background color, and the ones that are inside
// the found rectangle are all of the rectangle color.
for (int y = body.y(); y < body.bottom(); y++) {
for (int x = body.x(); x < body.right(); x++) {
SkColor color = bitmap.getColor(x, y);
gfx::Point pt(x, y);
if (rect.Contains(pt)) {
if (IsDifferentColor(color, rect_color)) {
LOG(ERROR) << "pt=" << pt.ToString() << " color=" << std::hex << color
<< ", expected rect color=" << std::hex << rect_color
<< ", color rect=" << rect.ToString();
return false;
}
} else {
// Expect background color unless the pixel is in anti aliasing
// rectangle which is adjacent to the actual color rectangle.
if (IsDifferentColor(color, bkgr_color) &&
!anti_aliasing_rect.Contains(pt)) {
LOG(ERROR) << "pt=" << pt.ToString() << " color=" << std::hex << color
<< ", expected bkgr color=" << std::hex << bkgr_color
<< ", color rect=" << rect.ToString();
return false;
}
}
}
}
return true;
}
bool CheckColoredRect(const SkBitmap& bitmap,
SkColor rect_color,
SkColor bkgr_color) {
return CheckColoredRect(bitmap, rect_color, bkgr_color, /*margins=*/0);
}
} // namespace headless
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