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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "pdf/pdf_ink_cursor.h"
#include <math.h>
#include <algorithm>
#include "base/check_op.h"
#include "pdf/pdf_ink_brush.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkPath.h"
namespace chrome_pdf {
namespace {
constexpr int kMinDiameter = 6;
constexpr int kMaxDiameter = 32;
void CheckCursorDiameterIsInRange(int diameter) {
CHECK_GE(diameter, kMinDiameter);
CHECK_LE(diameter, kMaxDiameter);
}
SkColor GetCursorOutlineColor(SkColor color) {
// Compute the lightness value as defined by HSL.
const uint8_t max =
std::max({SkColorGetR(color), SkColorGetG(color), SkColorGetB(color)});
const uint8_t min =
std::min({SkColorGetR(color), SkColorGetG(color), SkColorGetB(color)});
const int lightness = 0.5 * (max + min);
// Use lighter outline for darker `color`.
constexpr SkColor kDarkOutlineColor = SkColorSetARGB(0xFF, 0x90, 0x90, 0x90);
constexpr SkColor kLightOutlineColor = SkColorSetARGB(0xFF, 0xAA, 0xAA, 0xAA);
return lightness > 127 ? kDarkOutlineColor : kLightOutlineColor;
}
} // namespace
int CursorDiameterFromBrushSizeAndZoom(float brush_size, float zoom) {
CHECK(PdfInkBrush::IsToolSizeInRange(brush_size));
constexpr float kMinSize = 4; // Cursor become very hard to see if smaller.
float cursor_diameter = std::max(brush_size * zoom, kMinSize);
// Fudge factors to better match sizes used in Chrome OS Gallery.
constexpr int kSmallAdjustment = 2;
constexpr int kLargeAdjustment = 4;
constexpr int kLargeSize = 10;
int adjustment =
cursor_diameter < kLargeSize ? kSmallAdjustment : kLargeAdjustment;
return std::clamp(static_cast<int>(round(cursor_diameter)) + adjustment,
kMinDiameter, kMaxDiameter);
}
SkBitmap GenerateToolCursor(SkColor color, int diameter) {
CheckCursorDiameterIsInRange(diameter);
SkBitmap bitmap;
bitmap.allocPixels(
SkImageInfo::MakeN32(diameter, diameter, kPremul_SkAlphaType));
SkCanvas canvas(bitmap);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(GetCursorOutlineColor(color));
paint.setStyle(SkPaint::kFill_Style);
auto rect = SkRect::MakeWH(diameter, diameter);
SkPath outline_path;
outline_path.addOval(rect, SkPathDirection::kCW, 1);
canvas.drawPath(outline_path, paint);
paint.setColor(color);
SkPath fill_path;
rect.inset(1, 1);
fill_path.addOval(rect, SkPathDirection::kCW, 1);
canvas.drawPath(fill_path, paint);
return bitmap;
}
} // namespace chrome_pdf
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