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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "ui/gfx/shadow_value.h"
- #include <stddef.h>
- #include <algorithm>
- #include "base/check_op.h"
- #include "base/numerics/safe_conversions.h"
- #include "base/strings/stringprintf.h"
- #include "ui/gfx/color_palette.h"
- #include "ui/gfx/geometry/insets.h"
- #include "ui/gfx/geometry/vector2d_conversions.h"
- namespace gfx {
- namespace {
- Insets GetInsets(const ShadowValues& shadows, bool include_inner_blur) {
- int left = 0;
- int top = 0;
- int right = 0;
- int bottom = 0;
- for (size_t i = 0; i < shadows.size(); ++i) {
- const ShadowValue& shadow = shadows[i];
- double blur = shadow.blur();
- if (!include_inner_blur)
- blur /= 2;
- int blur_length = base::ClampRound(blur);
- left = std::max(left, blur_length - shadow.x());
- top = std::max(top, blur_length - shadow.y());
- right = std::max(right, blur_length + shadow.x());
- bottom = std::max(bottom, blur_length + shadow.y());
- }
- return Insets::TLBR(top, left, bottom, right);
- }
- } // namespace
- ShadowValue ShadowValue::Scale(float scale) const {
- Vector2d scaled_offset = ToFlooredVector2d(ScaleVector2d(offset_, scale));
- return ShadowValue(scaled_offset, blur_ * scale, color_);
- }
- std::string ShadowValue::ToString() const {
- return base::StringPrintf(
- "(%d,%d),%.2f,rgba(%d,%d,%d,%d)",
- offset_.x(), offset_.y(),
- blur_,
- SkColorGetR(color_),
- SkColorGetG(color_),
- SkColorGetB(color_),
- SkColorGetA(color_));
- }
- // static
- Insets ShadowValue::GetMargin(const ShadowValues& shadows) {
- Insets margins = GetInsets(shadows, false);
- return -margins;
- }
- // static
- Insets ShadowValue::GetBlurRegion(const ShadowValues& shadows) {
- return GetInsets(shadows, true);
- }
- // static
- ShadowValues ShadowValue::MakeShadowValues(int elevation,
- SkColor key_shadow_color,
- SkColor ambient_shadow_color) {
- // Refresh uses hand-tweaked shadows corresponding to a small set of
- // elevations. Use the Refresh spec and designer input to add missing shadow
- // values.
- // To match the CSS notion of blur (spread outside the bounding box) to the
- // Skia notion of blur (spread outside and inside the bounding box), we have
- // to double the designer-provided blur values.
- const int kBlurCorrection = 2;
- switch (elevation) {
- case 3: {
- ShadowValue key = {Vector2d(0, 1), 12, key_shadow_color};
- ShadowValue ambient = {Vector2d(0, 4), 64, ambient_shadow_color};
- return {key, ambient};
- }
- case 16: {
- ShadowValue key = {Vector2d(0, 0), kBlurCorrection * 16,
- key_shadow_color};
- ShadowValue ambient = {Vector2d(0, 12), kBlurCorrection * 16,
- ambient_shadow_color};
- return {key, ambient};
- }
- default:
- // This surface has not been updated for Refresh. Fall back to the
- // deprecated style.
- DCHECK_EQ(key_shadow_color, ambient_shadow_color);
- return MakeMdShadowValues(elevation, key_shadow_color);
- }
- }
- // static
- ShadowValues ShadowValue::MakeMdShadowValues(int elevation, SkColor color) {
- ShadowValues shadow_values;
- // To match the CSS notion of blur (spread outside the bounding box) to the
- // Skia notion of blur (spread outside and inside the bounding box), we have
- // to double the designer-provided blur values.
- const int kBlurCorrection = 2;
- // "Key shadow": y offset is elevation and blur is twice the elevation.
- shadow_values.emplace_back(Vector2d(0, elevation),
- kBlurCorrection * elevation * 2,
- SkColorSetA(color, 0x3d));
- // "Ambient shadow": no offset and blur matches the elevation.
- shadow_values.emplace_back(Vector2d(), kBlurCorrection * elevation,
- SkColorSetA(color, 0x1f));
- // To see what this looks like for elevation 24, try this CSS:
- // box-shadow: 0 24px 48px rgba(0, 0, 0, .24),
- // 0 0 24px rgba(0, 0, 0, .12);
- return shadow_values;
- }
- #if BUILDFLAG(IS_CHROMEOS_ASH)
- // static
- ShadowValues ShadowValue::MakeChromeOSSystemUIShadowValues(int elevation,
- SkColor color) {
- ShadowValues shadow_values;
- // To match the CSS notion of blur (spread outside the bounding box) to the
- // Skia notion of blur (spread outside and inside the bounding box), we have
- // to double the designer-provided blur values.
- const int kBlurCorrection = 2;
- // "Key shadow": y offset is elevation and blur value is equal to the
- // elevation.
- shadow_values.emplace_back(Vector2d(0, elevation),
- kBlurCorrection * elevation,
- SkColorSetA(color, 0x3d));
- // "Ambient shadow": no offset and blur matches the elevation.
- shadow_values.emplace_back(Vector2d(), kBlurCorrection * elevation,
- SkColorSetA(color, 0x1a));
- // To see what this looks like for elevation 24, try this CSS:
- // box-shadow: 0 24px 24px rgba(0, 0, 0, .24),
- // 0 0 24px rgba(0, 0, 0, .10);
- return shadow_values;
- }
- #endif
- } // namespace gfx
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