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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 "chrome/browser/ui/webui/side_panel/read_anything/read_anything_screenshotter.h"
#include <string>
#include "base/base_paths.h"
#include "base/files/file_path.h"
#include "base/functional/callback_helpers.h"
#include "base/path_service.h"
#include "base/strings/stringprintf.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "components/paint_preview/browser/compositor_utils.h"
#include "components/paint_preview/browser/paint_preview_base_service.h"
#include "components/paint_preview/common/recording_map.h"
#include "mojo/public/cpp/base/proto_wrapper.h"
#include "skia/rusty_png_feature.h"
#include "third_party/skia/include/core/SkImage.h"
#include "third_party/skia/include/core/SkStream.h"
#include "third_party/skia/include/encode/SkPngEncoder.h"
#include "ui/gfx/geometry/rect.h"
constexpr size_t kMaxScreenshotFileSize = 50 * 1000L * 1000L; // 50 MB.
namespace {
int debug_file_sequencer = 0;
// Crops the pixmap to the first non-transparent pixel in each row and column.
// This is necessary because the screenshotter sometimes returns a bitmap with
// transparent pixels outside the bounds of the page.
bool CropPixmap(const SkPixmap& pixmap, SkPixmap* cropped_pixmap) {
SkIRect bounds = pixmap.bounds();
int top = 0;
int left = 0;
int bottom = bounds.height();
int right = bounds.width();
while (top < bounds.height() && pixmap.getColor(0, top) == 0) {
top++;
}
while (left < bounds.width() && pixmap.getColor(left, 0) == 0) {
left++;
}
while (bottom >= 0 && pixmap.getColor(0, bottom - 1) == 0) {
bottom--;
}
while (right >= 0 && pixmap.getColor(right - 1, 0) == 0) {
right--;
}
SkIRect area = SkIRect::MakeLTRB(left, top, right, bottom);
return pixmap.extractSubset(cropped_pixmap, area);
}
void WriteBitmapToPng(const SkBitmap& bitmap) {
base::FilePath temp_dir;
CHECK(base::PathService::Get(base::DIR_TEMP, &temp_dir));
std::string screenshot_filename = base::StringPrintf(
"csai_main_content_web_screenshot_%i.png", debug_file_sequencer++);
std::string screenshot_filepath =
temp_dir.AppendASCII(screenshot_filename).MaybeAsASCII();
SkFILEWStream out_file(screenshot_filepath.c_str());
if (!out_file.isValid()) {
VLOG(2) << "Unable to create: " << screenshot_filepath;
return;
}
SkPixmap cropped_pixmap;
bool success_crop = CropPixmap(bitmap.pixmap(), &cropped_pixmap);
if (!success_crop) {
VLOG(2) << "Failed to crop pixmap: " << screenshot_filepath;
return;
}
bool success_encode =
skia::EncodePng(&out_file, cropped_pixmap, /*options=*/{});
if (success_encode) {
VLOG(2) << "Wrote debug file: " << screenshot_filepath;
} else {
VLOG(2) << "Failed to write debug file: " << screenshot_filepath;
}
}
} // namespace
ReadAnythingScreenshotter::ReadAnythingScreenshotter()
: paint_preview::PaintPreviewBaseService(
/*file_mixin=*/nullptr, // in-memory captures
/*policy=*/nullptr, // all content is deemed amenable
/*is_off_the_record=*/false),
paint_preview_compositor_service_(nullptr,
base::OnTaskRunnerDeleter(nullptr)),
paint_preview_compositor_client_(nullptr,
base::OnTaskRunnerDeleter(nullptr)) {
paint_preview_compositor_service_ =
paint_preview::StartCompositorService(base::BindOnce(
&ReadAnythingScreenshotter::OnCompositorServiceDisconnected,
weak_ptr_factory_.GetWeakPtr()));
CHECK(paint_preview_compositor_service_);
}
ReadAnythingScreenshotter::~ReadAnythingScreenshotter() = default;
void ReadAnythingScreenshotter::RequestScreenshot(
const raw_ptr<content::WebContents> web_contents) {
if (!web_contents) {
VLOG(2) << "The given web contents no longer valid";
return;
}
// Start capturing via Paint Preview.
CaptureParams capture_params;
capture_params.web_contents = web_contents;
capture_params.persistence =
paint_preview::RecordingPersistence::kMemoryBuffer;
capture_params.max_per_capture_size = kMaxScreenshotFileSize;
CapturePaintPreview(
capture_params,
base::BindOnce(&ReadAnythingScreenshotter::OnScreenshotCaptured,
weak_ptr_factory_.GetWeakPtr()));
}
void ReadAnythingScreenshotter::OnScreenshotCaptured(
paint_preview::PaintPreviewBaseService::CaptureStatus status,
std::unique_ptr<paint_preview::CaptureResult> result) {
if (status != PaintPreviewBaseService::CaptureStatus::kOk ||
!result->capture_success) {
VLOG(2) << base::StringPrintf(
"Failed to capture a screenshot (CaptureStatus=%d)",
static_cast<int>(status));
return;
}
if (!paint_preview_compositor_client_) {
paint_preview_compositor_client_ =
paint_preview_compositor_service_->CreateCompositor(
base::BindOnce(&ReadAnythingScreenshotter::SendCompositeRequest,
weak_ptr_factory_.GetWeakPtr(),
PrepareCompositeRequest(std::move(result))));
} else {
SendCompositeRequest(PrepareCompositeRequest(std::move(result)));
}
}
paint_preview::mojom::PaintPreviewBeginCompositeRequestPtr
ReadAnythingScreenshotter::PrepareCompositeRequest(
std::unique_ptr<paint_preview::CaptureResult> capture_result) {
paint_preview::mojom::PaintPreviewBeginCompositeRequestPtr
begin_composite_request =
paint_preview::mojom::PaintPreviewBeginCompositeRequest::New();
std::pair<paint_preview::RecordingMap, paint_preview::PaintPreviewProto>
map_and_proto = paint_preview::RecordingMapFromCaptureResult(
std::move(*capture_result));
begin_composite_request->recording_map = std::move(map_and_proto.first);
if (begin_composite_request->recording_map.empty()) {
VLOG(2) << "Captured an empty screenshot";
return nullptr;
}
begin_composite_request->preview =
mojo_base::ProtoWrapper(std::move(map_and_proto.second));
return begin_composite_request;
}
void ReadAnythingScreenshotter::SendCompositeRequest(
paint_preview::mojom::PaintPreviewBeginCompositeRequestPtr
begin_composite_request) {
if (!begin_composite_request) {
VLOG(2) << "Invalid begin_composite_request";
return;
}
CHECK(paint_preview_compositor_client_);
paint_preview_compositor_client_->BeginMainFrameComposite(
std::move(begin_composite_request),
base::BindOnce(&ReadAnythingScreenshotter::OnCompositeFinished,
weak_ptr_factory_.GetWeakPtr()));
}
void ReadAnythingScreenshotter::OnCompositorServiceDisconnected() {
VLOG(2) << "Compositor service is disconnected";
paint_preview_compositor_client_.reset();
paint_preview_compositor_service_.reset();
}
void ReadAnythingScreenshotter::OnCompositeFinished(
paint_preview::mojom::PaintPreviewCompositor::BeginCompositeStatus status,
paint_preview::mojom::PaintPreviewBeginCompositeResponsePtr response) {
if (status != paint_preview::mojom::PaintPreviewCompositor::
BeginCompositeStatus::kSuccess &&
status != paint_preview::mojom::PaintPreviewCompositor::
BeginCompositeStatus::kPartialSuccess) {
VLOG(2) << base::StringPrintf(
"Failed to composite (BeginCompositeStatus=%d)",
static_cast<int>(status));
return;
}
// Start converting to a bitmap.
RequestBitmapForMainFrame();
}
void ReadAnythingScreenshotter::RequestBitmapForMainFrame() {
// Passing an empty `gfx::Rect` allows us to get a bitmap for the full page.
paint_preview_compositor_client_->BitmapForMainFrame(
gfx::Rect(), /*scale_factor=*/1.0,
base::BindOnce(&ReadAnythingScreenshotter::OnBitmapReceived,
weak_ptr_factory_.GetWeakPtr()));
}
void ReadAnythingScreenshotter::OnBitmapReceived(
paint_preview::mojom::PaintPreviewCompositor::BitmapStatus status,
const SkBitmap& bitmap) {
if (status != paint_preview::mojom::PaintPreviewCompositor::BitmapStatus::
kSuccess ||
bitmap.empty()) {
VLOG(2) << base::StringPrintf("Failed to get bitmap (BitmapStatus=%d)",
static_cast<int>(status));
return;
}
base::ThreadPool::PostTask(
FROM_HERE, {base::TaskPriority::BEST_EFFORT, base::MayBlock()},
base::BindOnce(&WriteBitmapToPng, bitmap));
}
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