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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 "ash/capture_mode/capture_region_overlay_controller.h"
#include <optional>
#include <string>
#include <utility>
#include "ash/capture_mode/capture_mode_constants.h"
#include "ash/constants/ash_features.h"
#include "ash/public/cpp/capture_mode/capture_mode_api.h"
#include "ash/scanner/scanner_text.h"
#include "base/time/time.h"
#include "cc/paint/filter_operation.h"
#include "cc/paint/filter_operations.h"
#include "cc/paint/paint_filter.h"
#include "cc/paint/paint_flags.h"
#include "cc/paint/render_surface_filters.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/chromeos/styles/cros_tokens_color_mappings.h"
#include "ui/color/color_provider.h"
#include "ui/gfx/animation/animation_delegate.h"
#include "ui/gfx/animation/throb_animation.h"
#include "ui/gfx/animation/tween.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/font_list.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/range/range.h"
#include "ui/gfx/skia_paint_util.h"
namespace ash {
namespace {
// TODO(b/367548979): Use correct style constants for detected text regions.
constexpr SkColor kDetectedTextRegionColor = SK_ColorCYAN;
constexpr float kDetectedTextRegionOpacity = 0.3f;
// TODO(b/367549273): Use correct colors to paint translated text.
constexpr SkColor kTranslatedTextColor = SK_ColorBLACK;
constexpr SkColor kTranslatedTextBackgroundColor = SK_ColorWHITE;
// The duration of the region glow pulse animation.
constexpr base::TimeDelta kRegionGlowPulseDuration = base::Milliseconds(666);
// The minimum and maximum opacity of the region glow pulse animation.
constexpr float kRegionGlowMinOpacity = 0.35f;
constexpr float kRegionGlowMaxOpacity = 1.0f;
// Translates and rotates `canvas` so that `center_rotated_box` is upright and
// centered on the canvas. The components of `center_rotated_box` should be
// specified as coordinates relative to `region`.
void TranslateAndRotateCanvas(
gfx::Canvas& canvas,
const gfx::Rect& region,
const ScannerText::CenterRotatedBox& center_rotated_box) {
canvas.Translate(center_rotated_box.center.OffsetFromOrigin() +
region.origin().OffsetFromOrigin());
canvas.sk_canvas()->rotate(center_rotated_box.rotation);
}
// Gets a rect with size `size` centered at the origin (offset to the nearest
// integer coordinates if `size` has odd width or odd height).
gfx::Rect GetRectCenteredAtOrigin(const gfx::Size& size) {
return gfx::Rect(-size.width() / 2, -size.height() / 2, size.width(),
size.height());
}
} // namespace
CaptureRegionOverlayController::CaptureRegionOverlayController() {
DCHECK(CanShowSunfishOrScannerUi());
}
CaptureRegionOverlayController::~CaptureRegionOverlayController() = default;
void CaptureRegionOverlayController::OnTextDetected(
std::optional<ScannerText> detected_text) {
detected_text_ = std::move(detected_text);
}
void CaptureRegionOverlayController::OnTranslatedTextFetched(
std::optional<ScannerText> translated_text) {
translated_text_ = std::move(translated_text);
}
void CaptureRegionOverlayController::PaintCaptureRegionOverlay(
gfx::Canvas& canvas,
const gfx::Rect& region_bounds_in_canvas) const {
PaintDetectedTextRegions(canvas, region_bounds_in_canvas);
PaintTranslatedText(canvas, region_bounds_in_canvas);
}
void CaptureRegionOverlayController::StartGlowAnimation(
gfx::AnimationDelegate* animation_delegate) {
if (!glow_animation_) {
glow_animation_ = std::make_unique<gfx::ThrobAnimation>(animation_delegate);
glow_animation_->SetThrobDuration(kRegionGlowPulseDuration);
glow_animation_->SetTweenType(gfx::Tween::LINEAR);
}
// Set `cycles_til_stop` to be negative so that the animation continues
// indefinitely.
glow_animation_->StartThrobbing(/*cycles_til_stop=*/-1);
}
void CaptureRegionOverlayController::PauseGlowAnimation() {
if (glow_animation_) {
// Complete the current animation cycle then remain there. This will pause
// the glow animation at the end of the cycle, where the glow has minimum
// outset and blur.
glow_animation_->set_cycles_remaining(0);
}
}
void CaptureRegionOverlayController::RemoveGlowAnimation() {
glow_animation_ = nullptr;
}
bool CaptureRegionOverlayController::HasGlowAnimation() const {
return glow_animation_ != nullptr;
}
void CaptureRegionOverlayController::PaintCurrentGlowState(
gfx::Canvas& canvas,
const gfx::Rect& region_bounds_in_canvas,
const ui::ColorProvider* color_provider) const {
if (!glow_animation_) {
return;
}
gfx::Rect current_glow_bounds(region_bounds_in_canvas);
current_glow_bounds.Outset(glow_animation_->CurrentValueBetween(
capture_mode::kRegionGlowMinOutsetDp,
capture_mode::kRegionGlowMaxOutsetDp));
cc::PaintFlags flags;
flags.setAlphaf(static_cast<float>(glow_animation_->CurrentValueBetween(
kRegionGlowMinOpacity, kRegionGlowMaxOpacity)));
flags.setShader(gfx::CreateGradientShader(
current_glow_bounds.origin(), current_glow_bounds.top_right(),
color_provider->GetColor(cros_tokens::kCrosSysMuted),
color_provider->GetColor(cros_tokens::kCrosSysComplement)));
flags.setImageFilter(cc::RenderSurfaceFilters::BuildImageFilter(
cc::FilterOperations({cc::FilterOperation::CreateBlurFilter(
glow_animation_->CurrentValueBetween(
capture_mode::kRegionGlowAnimationMinBlurDp,
capture_mode::kRegionGlowAnimationMaxBlurDp))})));
canvas.DrawRect(current_glow_bounds, flags);
}
void CaptureRegionOverlayController::PaintDetectedTextRegions(
gfx::Canvas& canvas,
const gfx::Rect& region_bounds_in_canvas) const {
if (!detected_text_.has_value()) {
return;
}
// TODO(b/367548979): Paint detected text regions with correct styling.
cc::PaintFlags flags;
flags.setStyle(cc::PaintFlags::kFill_Style);
flags.setColor(kDetectedTextRegionColor);
flags.setAlphaf(kDetectedTextRegionOpacity);
for (const ScannerText::Paragraph& paragraph : detected_text_->paragraphs()) {
for (const ScannerText::Line& line : paragraph.lines()) {
canvas.Save();
TranslateAndRotateCanvas(canvas, region_bounds_in_canvas,
line.bounding_box());
canvas.DrawRect(GetRectCenteredAtOrigin(line.bounding_box().size), flags);
canvas.Restore();
}
}
}
void CaptureRegionOverlayController::PaintTranslatedText(
gfx::Canvas& canvas,
const gfx::Rect& region_bounds_in_canvas) const {
if (!translated_text_.has_value()) {
return;
}
// TODO(b/367549273): Paint translated text with correct styling.
cc::PaintFlags flags;
flags.setStyle(cc::PaintFlags::kFill_Style);
flags.setColor(kTranslatedTextBackgroundColor);
for (const ScannerText::Paragraph& paragraph :
translated_text_->paragraphs()) {
for (const ScannerText::Line& line : paragraph.lines()) {
canvas.Save();
TranslateAndRotateCanvas(canvas, region_bounds_in_canvas,
line.bounding_box());
const gfx::Rect centered_bounds =
GetRectCenteredAtOrigin(line.bounding_box().size);
canvas.DrawRect(centered_bounds, flags);
canvas.DrawStringRect(translated_text_->GetTextFromRange(line.range()),
gfx::FontList(), kTranslatedTextColor,
centered_bounds);
canvas.Restore();
}
}
}
} // namespace ash
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