Moterm part 5: Add moterm itself.

apps/moterm/moterm_view.cc

+// Copyright 2015 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 "apps/moterm/moterm_view.h"
+
+#ifndef GL_GLEXT_PROTOTYPES
+#define GL_GLEXT_PROTOTYPES
+#endif
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+#include <algorithm>
+#include <string>
+
+#include "apps/moterm/key_util.h"
+#include "base/logging.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/services/files/public/interfaces/file.mojom.h"
+#include "mojo/services/files/public/interfaces/types.mojom.h"
+#include "mojo/services/input_events/public/interfaces/input_event_constants.mojom.h"
+#include "mojo/services/input_events/public/interfaces/input_events.mojom.h"
+#include "mojo/services/terminal/public/interfaces/terminal_client.mojom.h"
+#include "skia/ext/refptr.h"
+#include "third_party/dejavu-fonts-ttf-2.34/kDejaVuSansMonoRegular.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkImageInfo.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkRect.h"
+#include "third_party/skia/include/core/SkStream.h"
+#include "third_party/skia/include/core/SkXfermode.h"
+
+namespace {
+
+const GLint kTextureFormat =
+    (kN32_SkColorType == kRGBA_8888_SkColorType) ? GL_RGBA : GL_BGRA_EXT;
+
+mojo::Size RectToSize(const mojo::Rect& rect) {
+  mojo::Size size;
+  size.width = rect.width;
+  size.height = rect.height;
+  return size;
+}
+
+}  // namespace
+
+MotermView::MotermView(
+    mojo::Shell* shell,
+    mojo::View* view,
+    mojo::InterfaceRequest<mojo::ServiceProvider> service_provider_request)
+    : view_(view),
+      gl_helper_(this, shell, kTextureFormat, RectToSize(view->bounds())),
+      model_(MotermModel::Size(240, 160), MotermModel::Size(24, 80)),
+      frame_pending_(false),
+      force_next_draw_(false),
+      ascent_(0),
+      line_height_(0),
+      advance_width_(0) {
+  // TODO(vtl): |service_provider_impl_|'s ctor doesn't like an invalid request,
+  // so we have to conditionally, explicitly bind.
+  if (service_provider_request.is_pending()) {
+    service_provider_impl_.Bind(service_provider_request.Pass());
+    service_provider_impl_.AddService<mojo::terminal::Terminal>(this);
+  }
+
+  regular_typeface_ = skia::AdoptRef(SkTypeface::CreateFromStream(
+      new SkMemoryStream(font_data::kDejaVuSansMonoRegular.data,
+                         font_data::kDejaVuSansMonoRegular.size)));
+
+  // TODO(vtl): This duplicates some code.
+  SkPaint fg_paint;
+  fg_paint.setTypeface(regular_typeface_.get());
+  fg_paint.setTextSize(16);
+  // Figure out appropriate metrics.
+  SkPaint::FontMetrics fm = {};
+  fg_paint.getFontMetrics(&fm);
+  ascent_ = static_cast<int>(ceilf(-fm.fAscent));
+  line_height_ = ascent_ + static_cast<int>(ceilf(fm.fDescent + fm.fLeading));
+  DCHECK_GT(line_height_, 0);
+  // To figure out the advance width, measure an X. Better hope the font is
+  // monospace.
+  advance_width_ = static_cast<int>(ceilf(fg_paint.measureText("X", 1)));
+  DCHECK_GT(advance_width_, 0);
+
+  view_->AddObserver(this);
+
+  // Force an initial draw.
+  Draw(true);
+}
+
+MotermView::~MotermView() {
+  if (driver_)
+    driver_->Detach();
+}
+
+void MotermView::OnViewDestroyed(mojo::View* view) {
+  DCHECK(view == view_);
+  view_->RemoveObserver(this);
+  delete this;
+}
+
+void MotermView::OnViewBoundsChanged(mojo::View* view,
+                                     const mojo::Rect& old_bounds,
+                                     const mojo::Rect& new_bounds) {
+  DCHECK_EQ(view, view_);
+  gl_helper_.SetSurfaceSize(RectToSize(view_->bounds()));
+  bitmap_device_.clear();
+  Draw(true);
+}
+
+void MotermView::OnViewInputEvent(mojo::View* view,
+                                  const mojo::EventPtr& event) {
+  if (event->action == mojo::EVENT_TYPE_KEY_PRESSED)
+    OnKeyPressed(event);
+}
+
+void MotermView::OnSurfaceIdChanged(mojo::SurfaceIdPtr surface_id) {
+  view_->SetSurfaceId(surface_id.Pass());
+}
+
+void MotermView::OnContextLost() {
+  // TODO(vtl): We'll need to force a draw when we regain a context.
+}
+
+void MotermView::OnFrameDisplayed(uint32_t frame_id) {
+  DCHECK(frame_pending_);
+  frame_pending_ = false;
+  Draw(false);
+}
+
+void MotermView::OnDataReceived(const void* bytes, size_t num_bytes) {
+  model_.ProcessInput(bytes, num_bytes, &model_state_changes_);
+  Draw(false);
+}
+
+void MotermView::OnClosed() {
+  DCHECK(driver_);
+  driver_->Detach();
+  driver_.reset();
+
+  OnDestroyed();
+}
+
+void MotermView::OnDestroyed() {
+  DCHECK(!driver_);
+  if (!on_closed_callback_.is_null()) {
+    mojo::Closure callback;
+    std::swap(callback, on_closed_callback_);
+    callback.Run();
+  }
+}
+
+void MotermView::Create(
+    mojo::ApplicationConnection* connection,
+    mojo::InterfaceRequest<mojo::terminal::Terminal> request) {
+  terminal_bindings_.AddBinding(this, request.Pass());
+}
+
+void MotermView::Connect(
+    mojo::InterfaceRequest<mojo::files::File> terminal_file,
+    bool force,
+    const ConnectCallback& callback) {
+  if (driver_) {
+    // We already have a connection.
+    if (force) {
+      OnClosed();
+    } else {
+      // TODO(vtl): Is this error code right?
+      callback.Run(mojo::files::ERROR_UNAVAILABLE);
+      return;
+    }
+  }
+
+  driver_ = MotermDriver::Create(this, terminal_file.Pass());
+  DCHECK(on_closed_callback_.is_null());
+  on_closed_callback_ = [callback] { callback.Run(mojo::files::ERROR_OK); };
+}
+
+void MotermView::ConnectToClient(
+    mojo::terminal::TerminalClientPtr terminal_client,
+    bool force,
+    const ConnectToClientCallback& callback) {
+  if (driver_) {
+    // We already have a connection.
+    if (force) {
+      OnClosed();
+    } else {
+      // TODO(vtl): Is this error code right?
+      callback.Run(mojo::files::ERROR_UNAVAILABLE);
+      return;
+    }
+  }
+
+  mojo::files::FilePtr file;
+  driver_ = MotermDriver::Create(this, GetProxy(&file));
+  terminal_client->ConnectToTerminal(file.Pass());
+  DCHECK(on_closed_callback_.is_null());
+  on_closed_callback_ = [callback] { callback.Run(mojo::files::ERROR_OK); };
+}
+
+void MotermView::GetSize(const GetSizeCallback& callback) {
+  MotermModel::Size size = model_.GetSize();
+  callback.Run(mojo::files::ERROR_OK, size.rows, size.columns);
+}
+
+void MotermView::SetSize(uint32_t rows,
+                         uint32_t columns,
+                         bool reset,
+                         const SetSizeCallback& callback) {
+  if (!rows) {
+    rows = std::max(1u, std::min(MotermModel::kMaxRows,
+                                 static_cast<uint32_t>(view_->bounds().height) /
+                                     line_height_));
+  }
+  if (!columns) {
+    columns =
+        std::max(1u, std::min(MotermModel::kMaxColumns,
+                              static_cast<uint32_t>(view_->bounds().width) /
+                                  advance_width_));
+  }
+
+  model_.SetSize(MotermModel::Size(rows, columns), reset);
+  callback.Run(mojo::files::ERROR_OK, rows, columns);
+
+  Draw(false);
+}
+
+void MotermView::Draw(bool force) {
+  // TODO(vtl): See TODO above |frame_pending_| in the class declaration.
+  if (frame_pending_) {
+    force_next_draw_ |= force;
+    return;
+  }
+
+  force |= force_next_draw_;
+  force_next_draw_ = false;
+
+  if (!force && !model_state_changes_.IsDirty())
+    return;
+
+  // TODO(vtl): If |!force|, draw only the dirty region(s)?
+  model_state_changes_.Reset();
+
+  int32_t width = view_->bounds().width;
+  int32_t height = view_->bounds().height;
+  DCHECK_GT(width, 0);
+  DCHECK_GT(height, 0);
+
+  if (!bitmap_device_) {
+    bitmap_device_ = skia::AdoptRef(SkBitmapDevice::Create(SkImageInfo::Make(
+        width, height, kN32_SkColorType, kOpaque_SkAlphaType)));
+  }
+
+  SkCanvas canvas(bitmap_device_.get());
+  canvas.clear(SK_ColorBLACK);
+
+  SkPaint bg_paint;
+  bg_paint.setStyle(SkPaint::kFill_Style);
+
+  SkPaint fg_paint;
+  fg_paint.setTypeface(regular_typeface_.get());
+  fg_paint.setTextSize(16);
+  fg_paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
+
+  MotermModel::Size size = model_.GetSize();
+  int y = 0;
+  for (unsigned i = 0; i < size.rows; i++, y += line_height_) {
+    int x = 0;
+    for (unsigned j = 0; j < size.columns; j++, x += advance_width_) {
+      MotermModel::CharacterInfo ch =
+          model_.GetCharacterInfoAt(MotermModel::Position(i, j));
+
+      // Paint the background.
+      bg_paint.setColor(SkColorSetRGB(ch.background_color.red,
+                                      ch.background_color.green,
+                                      ch.background_color.blue));
+      canvas.drawRect(SkRect::MakeXYWH(x, y, advance_width_, line_height_),
+                      bg_paint);
+
+      // Paint the foreground.
+      if (ch.code_point) {
+        uint32_t flags = SkPaint::kAntiAlias_Flag;
+        // TODO(vtl): Use real bold font?
+        if ((ch.attributes & MotermModel::kAttributesBold))
+          flags |= SkPaint::kFakeBoldText_Flag;
+        if ((ch.attributes & MotermModel::kAttributesUnderline))
+          flags |= SkPaint::kUnderlineText_Flag;
+        // TODO(vtl): Handle blink, because that's awesome.
+        fg_paint.setFlags(flags);
+        fg_paint.setColor(SkColorSetRGB(ch.foreground_color.red,
+                                        ch.foreground_color.green,
+                                        ch.foreground_color.blue));
+
+        canvas.drawText(&ch.code_point, sizeof(ch.code_point), x, y + ascent_,
+                        fg_paint);
+      }
+    }
+  }
+
+  // Draw the cursor.
+  MotermModel::Position cursor_pos = model_.GetCursorPosition();
+  // Reuse the background paint, but don't just paint over.
+  // TODO(vtl): Consider doing other things. Maybe make it blink, to be extra
+  // annoying.
+  // TODO(vtl): Maybe vary how we draw the cursor, depending on if we're focused
+  // and/or active.
+  bg_paint.setColor(SK_ColorWHITE);
+  bg_paint.setXfermodeMode(SkXfermode::kDifference_Mode);
+  canvas.drawRect(SkRect::MakeXYWH(cursor_pos.column * advance_width_,
+                                   cursor_pos.row * line_height_,
+                                   advance_width_, line_height_),
+                  bg_paint);
+
+  canvas.flush();
+
+  const SkBitmap& bitmap(bitmap_device_->accessBitmap(false));
+  // TODO(vtl): Do we need really need to lock/unlock pixels?
+  SkAutoLockPixels pixel_locker(bitmap);
+
+  gl_helper_.StartFrame();
+  // (The texture is already bound.)
+  glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, kTextureFormat,
+                  GL_UNSIGNED_BYTE, bitmap.getPixels());
+  gl_helper_.EndFrame();
+  frame_pending_ = true;
+}
+
+void MotermView::OnKeyPressed(const mojo::EventPtr& key_event) {
+  std::string input_sequence = GetInputSequenceForKeyPressedEvent(*key_event);
+  if (input_sequence.empty())
+    return;
+
+  if (driver_)
+    driver_->SendData(input_sequence.data(), input_sequence.size());
+}