Add the pdf plugin's source in src\pdf.

pdf/thumbnail_control.cc

+// 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 "pdf/thumbnail_control.h"
+
+#include <algorithm>
+
+#include "base/logging.h"
+#include "base/strings/string_util.h"
+#include "pdf/draw_utils.h"
+#include "pdf/number_image_generator.h"
+
+namespace chrome_pdf {
+
+const int kLeftBorderSize = 52;
+const int kBorderSize = 12;
+const int kHighlightBorderSize = 2;
+
+const uint32 kLeftColor = 0x003F537B;
+const uint32 kRightColor = 0x990D1626;
+
+const uint32 kTopHighlightColor = 0xFF426DC9;
+const uint32 kBottomHighlightColor = 0xFF6391DE;
+const uint32 kThumbnailBackgroundColor = 0xFF000000;
+
+const uint32 kSlidingTimeoutMs = 50;
+const int32 kSlidingShift = 50;
+
+const double kNonSelectedThumbnailAlpha = 0.91;
+
+ThumbnailControl::ThumbnailControl()
+    : engine_(NULL), sliding_width_(0), sliding_shift_(kSlidingShift),
+      sliding_timeout_(kSlidingTimeoutMs), sliding_timer_id_(0) {
+}
+
+ThumbnailControl::~ThumbnailControl() {
+  ClearCache();
+}
+
+bool ThumbnailControl::CreateThumbnailControl(
+    uint32 id, const pp::Rect& rc,
+    bool visible, Owner* owner, PDFEngine* engine,
+    NumberImageGenerator* number_image_generator) {
+  engine_ = engine;
+  number_image_generator_ = number_image_generator;
+  sliding_width_ = rc.width();
+
+  return Control::Create(id, rc, visible, owner);
+}
+
+void ThumbnailControl::SetPosition(int position, int total, bool invalidate) {
+  visible_rect_ = pp::Rect();
+  visible_pages_.clear();
+
+  if (rect().width() < kLeftBorderSize + kBorderSize) {
+    return;  // control is too narrow to show thumbnails.
+  }
+
+  int num_pages = engine_->GetNumberOfPages();
+
+  int max_doc_width = 0, total_doc_height = 0;
+  std::vector<pp::Rect> page_sizes(num_pages);
+  for (int i = 0; i < num_pages; ++i) {
+    page_sizes[i] = engine_->GetPageRect(i);
+    max_doc_width = std::max(max_doc_width, page_sizes[i].width());
+    total_doc_height += page_sizes[i].height();
+  }
+
+  if (!max_doc_width)
+    return;
+
+  int max_thumbnail_width = rect().width() - kLeftBorderSize - kBorderSize;
+  double thumbnail_ratio =
+      max_thumbnail_width / static_cast<double>(max_doc_width);
+
+  int total_thumbnail_height = 0;
+  for (int i = 0; i < num_pages; ++i) {
+    total_thumbnail_height += kBorderSize;
+    int thumbnail_width =
+        static_cast<int>(page_sizes[i].width() * thumbnail_ratio);
+    int thumbnail_height =
+        static_cast<int>(page_sizes[i].height() * thumbnail_ratio);
+    int x = (max_thumbnail_width - thumbnail_width) / 2;
+    page_sizes[i] =
+        pp::Rect(x, total_thumbnail_height, thumbnail_width, thumbnail_height);
+    total_thumbnail_height += thumbnail_height;
+  }
+  total_thumbnail_height += kBorderSize;
+
+  int visible_y = 0;
+  if (total > 0) {
+    double range = total_thumbnail_height - rect().height();
+    if (range < 0)
+      range = 0;
+    visible_y = static_cast<int>(range * position / total);
+  }
+  visible_rect_ = pp::Rect(0, visible_y, max_thumbnail_width, rect().height());
+
+  for (int i = 0; i < num_pages; ++i) {
+    if (page_sizes[i].Intersects(visible_rect_)) {
+      PageInfo page_info;
+      page_info.index = i;
+      page_info.rect = page_sizes[i];
+      page_info.rect.Offset(kLeftBorderSize, -visible_rect_.y());
+      visible_pages_.push_back(page_info);
+    }
+  }
+
+  if (invalidate)
+    owner()->Invalidate(id(), rect());
+}
+
+void ThumbnailControl::Show(bool visible, bool invalidate) {
+  if (!visible || invalidate)
+    ClearCache();
+  sliding_width_ = rect().width();
+  Control::Show(visible, invalidate);
+}
+
+void ThumbnailControl::SlideIn() {
+  if (visible())
+    return;
+
+  Show(true, false);
+  sliding_width_ = 0;
+  sliding_shift_ = kSlidingShift;
+
+  sliding_timer_id_ = owner()->ScheduleTimer(id(), sliding_timeout_);
+  owner()->Invalidate(id(), rect());
+}
+
+void ThumbnailControl::SlideOut() {
+  if (!visible())
+    return;
+  sliding_shift_ = -kSlidingShift;
+  sliding_timer_id_ = owner()->ScheduleTimer(id(), sliding_timeout_);
+}
+
+void ThumbnailControl::Paint(pp::ImageData* image_data, const pp::Rect& rc) {
+  if (!visible())
+    return;
+
+  pp::Rect control_rc(rect());
+  control_rc.Offset(control_rc.width() - sliding_width_, 0);
+  control_rc.set_width(sliding_width_);
+
+  pp::Rect draw_rc = rc.Intersect(control_rc);
+  if (draw_rc.IsEmpty())
+    return;
+
+  pp::Rect gradient_rc(control_rc.x(), draw_rc.y(),
+                       control_rc.width(), draw_rc.height());
+  GradientFill(owner()->GetInstance(),
+               image_data,
+               draw_rc,
+               gradient_rc,
+               kLeftColor,
+               kRightColor,
+               true,
+               transparency());
+
+  int selected_page = engine_->GetMostVisiblePage();
+  for (size_t i = 0; i < visible_pages_.size(); ++i) {
+    pp::Rect page_rc = visible_pages_[i].rect;
+    page_rc.Offset(control_rc.point());
+
+    if (visible_pages_[i].index == selected_page) {
+      pp::Rect highlight_rc = page_rc;
+      highlight_rc.Inset(-kHighlightBorderSize, -kHighlightBorderSize);
+      GradientFill(owner()->GetInstance(),
+                   image_data,
+                   draw_rc,
+                   highlight_rc,
+                   kTopHighlightColor,
+                   kBottomHighlightColor,
+                   false,
+                   transparency());
+    }
+
+    pp::Rect draw_page_rc = page_rc.Intersect(draw_rc);
+    if (draw_page_rc.IsEmpty())
+      continue;
+
+    // First search page image in the cache.
+    pp::ImageData* thumbnail = NULL;
+    std::map<int, pp::ImageData*>::iterator it =
+        image_cache_.find(visible_pages_[i].index);
+    if (it != image_cache_.end()) {
+      if (it->second->size() == page_rc.size())
+        thumbnail = image_cache_[visible_pages_[i].index];
+      else
+        image_cache_.erase(it);
+    }
+
+    // If page is not found in the cache, create new one.
+    if (thumbnail == NULL) {
+      thumbnail = new pp::ImageData(owner()->GetInstance(),
+                                    PP_IMAGEDATAFORMAT_BGRA_PREMUL,
+                                    page_rc.size(),
+                                    false);
+      engine_->PaintThumbnail(thumbnail, visible_pages_[i].index);
+
+      pp::ImageData page_number;
+      number_image_generator_->GenerateImage(
+          visible_pages_[i].index + 1, &page_number);
+      pp::Point origin(
+          (thumbnail->size().width() - page_number.size().width()) / 2,
+          (thumbnail->size().height() - page_number.size().height()) / 2);
+
+      if (origin.x() > 0 && origin.y() > 0) {
+        AlphaBlend(page_number, pp::Rect(pp::Point(), page_number.size()),
+                   thumbnail, origin, kOpaqueAlpha);
+      }
+
+      image_cache_[visible_pages_[i].index] = thumbnail;
+    }
+
+    uint8 alpha = transparency();
+    if (visible_pages_[i].index != selected_page)
+      alpha = static_cast<uint8>(alpha * kNonSelectedThumbnailAlpha);
+    FillRect(image_data, draw_page_rc, kThumbnailBackgroundColor);
+    draw_page_rc.Offset(-page_rc.x(), -page_rc.y());
+    AlphaBlend(*thumbnail, draw_page_rc, image_data,
+        draw_page_rc.point() + page_rc.point(), alpha);
+  }
+}
+
+bool ThumbnailControl::HandleEvent(const pp::InputEvent& event) {
+  if (!visible())
+    return false;
+
+  pp::MouseInputEvent mouse_event(event);
+  if (mouse_event.is_null())
+    return false;
+  pp::Point pt = mouse_event.GetPosition();
+  if (!rect().Contains(pt))
+    return false;
+
+  int over_page = -1;
+  for (size_t i = 0; i < visible_pages_.size(); ++i) {
+    pp::Rect page_rc = visible_pages_[i].rect;
+    page_rc.Offset(rect().point());
+    if (page_rc.Contains(pt)) {
+      over_page = i;
+      break;
+    }
+  }
+
+  bool handled = false;
+  switch (event.GetType()) {
+    case PP_INPUTEVENT_TYPE_MOUSEMOVE:
+      owner()->SetCursor(id(),
+          over_page == -1 ? PP_CURSORTYPE_POINTER : PP_CURSORTYPE_HAND);
+      break;
+    case PP_INPUTEVENT_TYPE_MOUSEDOWN:
+      if (over_page != -1) {
+        owner()->Invalidate(id(), rect());
+        owner()->OnEvent(id(), EVENT_ID_THUMBNAIL_SELECTED,
+                         &visible_pages_[over_page].index);
+      }
+      handled = true;
+      break;
+    default:
+      break;
+  }
+
+  return handled;
+}
+
+void ThumbnailControl::OnTimerFired(uint32 timer_id) {
+  if (timer_id == sliding_timer_id_) {
+    sliding_width_ += sliding_shift_;
+    if (sliding_width_ <= 0) {
+      // We completely slided out. Make control invisible now.
+      Show(false, false);
+    } else if (sliding_width_ >= rect().width()) {
+      // We completely slided in. Make sliding width to full control width.
+      sliding_width_ = rect().width();
+    } else {
+      // We have not completed sliding yet. Keep sliding.
+      sliding_timer_id_ = owner()->ScheduleTimer(id(), sliding_timeout_);
+    }
+    owner()->Invalidate(id(), rect());
+  }
+}
+
+void ThumbnailControl::ResetEngine(PDFEngine* engine) {
+  engine_ = engine;
+  ClearCache();
+}
+
+void ThumbnailControl::ClearCache() {
+  std::map<int, pp::ImageData*>::iterator it;
+  for (it = image_cache_.begin(); it != image_cache_.end(); ++it) {
+    delete it->second;
+  }
+  image_cache_.clear();
+}
+
+}  // namespace chrome_pdf