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// Copyright 2020 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 "pdf/pdf_engine.h"
#include <stdint.h>
#include <memory>
#include <string>
#include "base/memory/weak_ptr.h"
#include "pdf/paint_manager.h"
#include "pdf/pdfium/pdfium_form_filler.h"
namespace chrome_pdf {
class PDFiumEngine;
class UrlLoader;
// Common base to share code between the two plugin implementations,
// `OutOfProcessInstance` (Pepper) and `PdfViewWebPlugin` (Blink).
class PdfViewPluginBase : public PDFEngine::Client,
public PaintManager::Client {
PdfViewPluginBase(const PdfViewPluginBase& other) = delete;
PdfViewPluginBase& operator=(const PdfViewPluginBase& other) = delete;
// PDFEngine::Client:
uint32_t GetBackgroundColor() override;
// PaintManager::Client
void OnPaint(const std::vector<gfx::Rect>& paint_rects,
std::vector<PaintReadyRect>* ready,
std::vector<gfx::Rect>* pending) override;
// The mininum zoom level allowed.
static constexpr double kMinZoom = 0.01;
~PdfViewPluginBase() override;
// Initializes the main `PDFiumEngine`. Any existing engine will be replaced.
void InitializeEngine(PDFiumFormFiller::ScriptOption script_option);
// Destroys the main `PDFiumEngine`. Subclasses should call this method in
// their destructor to ensure the engine is destroyed first.
void DestroyEngine();
PDFiumEngine* engine() { return engine_.get(); }
PaintManager& paint_manager() { return paint_manager_; }
// Starts loading `url`. If `is_print_preview` is `true`, load for print
// preview instead of normal PDF viewing.
void LoadUrl(const std::string& url, bool is_print_preview);
// Gets a weak pointer with a lifetime matching the derived class.
virtual base::WeakPtr<PdfViewPluginBase> GetWeakPtr() = 0;
// Creates a URL loader and allows it to access all urls, i.e. not just the
// frame's origin.
virtual std::unique_ptr<UrlLoader> CreateUrlLoaderInternal() = 0;
// Handles `LoadUrl()` result.
virtual void DidOpen(std::unique_ptr<UrlLoader> loader, int32_t result) = 0;
// Handles `LoadUrl()` result for print preview.
virtual void DidOpenPreview(std::unique_ptr<UrlLoader> loader,
int32_t result) = 0;
// Paints the given invalid area of the plugin to the given graphics device.
// PaintManager::Client::OnPaint() should be its only caller.
virtual void DoPaint(const std::vector<gfx::Rect>& paint_rects,
std::vector<PaintReadyRect>* ready,
std::vector<gfx::Rect>* pending) = 0;
// Called whenever the plugin geometry changes to update the location of the
// background parts, and notifies the pdf engine.
virtual void OnGeometryChanged(double old_zoom, float old_device_scale) = 0;
// Computes document width/height in device pixels, based on current zoom and
// device scale
int GetDocumentPixelWidth() const;
int GetDocumentPixelHeight() const;
const gfx::Size& document_size() const { return document_size_; }
void set_document_size(const gfx::Size& size) { document_size_ = size; }
const gfx::Size& plugin_size() const { return plugin_size_; }
void set_plugin_size(const gfx::Size& size) { plugin_size_ = size; }
const gfx::Size& plugin_dip_size() const { return plugin_dip_size_; }
void set_plugin_dip_size(const gfx::Size& size) { plugin_dip_size_ = size; }
const gfx::Point& plugin_offset() const { return plugin_offset_; }
void set_plugin_offset(const gfx::Point& offset) { plugin_offset_ = offset; }
void SetBackgroundColor(uint32_t background_color) {
background_color_ = background_color;
int top_toolbar_height_in_viewport_coords() const {
return top_toolbar_height_in_viewport_coords_;
void set_top_toolbar_height_in_viewport_coords(int height) {
top_toolbar_height_in_viewport_coords_ = height;
// Sets the new zoom scale.
void SetZoom(double scale);
double zoom() const { return zoom_; }
float device_scale() const { return device_scale_; }
void set_device_scale(float device_scale) { device_scale_ = device_scale; }
bool first_paint() const { return first_paint_; }
void set_first_paint(bool first_paint) { first_paint_ = first_paint; }
bool in_paint() const { return in_paint_; }
std::unique_ptr<PDFiumEngine> engine_;
PaintManager paint_manager_{this};
// The size of the entire document in pixels (i.e. if each page is 800 pixels
// high and there are 10 pages, the height will be 8000).
gfx::Size document_size_;
// Size, in pixels, of plugin rectangle.
gfx::Size plugin_size_;
// Size, in DIPs, of plugin rectangle.
gfx::Size plugin_dip_size_;
// Positional offset, in CSS pixels, of the plugin rectangle.
gfx::Point plugin_offset_;
// The background color of the PDF viewer.
uint32_t background_color_ = 0;
// The blank space above the first page of the document reserved for the
// toolbar.
int top_toolbar_height_in_viewport_coords_ = 0;
// Current zoom factor.
double zoom_ = 1.0;
// Current device scale factor. Multiply by `device_scale_` to convert from
// viewport to screen coordinates. Divide by `device_scale_` to convert from
// screen to viewport coordinates.
float device_scale_ = 1.0f;
// True if we haven't painted the plugin viewport yet.
bool first_paint_ = true;
// Whether OnPaint() is in progress or not.
bool in_paint_ = false;
} // namespace chrome_pdf