Duplicate chrome_canvas.cc in preparation for forking the file.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@6875 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 405 insertions, 0 deletions

diff --git a/chrome/common/gfx/chrome_canvas_win.cc b/chrome/common/gfx/chrome_canvas_win.cc
new file mode 100644
index 0000000..7c19b874
--- /dev/null
+++ b/chrome/common/gfx/chrome_canvas_win.cc
@@ -0,0 +1,405 @@
+// Copyright (c) 2006-2008 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 "chrome/common/gfx/chrome_canvas.h"
+
+#include <limits>
+
+#include "base/gfx/rect.h"
+#include "base/logging.h"
+#include "skia/include/SkShader.h"
+#include "chrome/common/gfx/chrome_font.h"
+#include "chrome/common/l10n_util.h"
+
+namespace {
+
+// We make sure that LTR text we draw in an RTL context is modified
+// appropriately to make sure it maintains it LTR orientation.
+void DoDrawText(HDC hdc, const std::wstring& text,
+                RECT* text_bounds, int flags) {
+  std::wstring localized_text;
+  const wchar_t* string_ptr = text.c_str();
+  int string_size = static_cast<int>(text.length());
+  if (l10n_util::AdjustStringForLocaleDirection(text, &localized_text)) {
+    string_ptr = localized_text.c_str();
+    string_size = static_cast<int>(localized_text.length());
+  }
+
+  DrawText(hdc, string_ptr, string_size, text_bounds, flags);
+}
+
+// Compute the windows flags necessary to implement the provided text
+// ChromeCanvas flags.
+int ComputeFormatFlags(int flags) {
+  int f = 0;
+
+  // Setting the text alignment explicitly in case it hasn't already been set.
+  // This will make sure that we don't align text to the left on RTL locales
+  // just because no alignment flag was passed to DrawStringInt().
+  if (!(flags & (ChromeCanvas::TEXT_ALIGN_CENTER |
+                 ChromeCanvas::TEXT_ALIGN_RIGHT |
+                 ChromeCanvas::TEXT_ALIGN_LEFT))) {
+    flags |= l10n_util::DefaultCanvasTextAlignment();
+  }
+
+  if (flags & ChromeCanvas::HIDE_PREFIX)
+    f |= DT_HIDEPREFIX;
+  else if ((flags & ChromeCanvas::SHOW_PREFIX) == 0)
+    f |= DT_NOPREFIX;
+
+  if (flags & ChromeCanvas::MULTI_LINE) {
+    f |= DT_WORDBREAK;
+  } else {
+    f |= DT_SINGLELINE | DT_VCENTER;
+    if (!(flags & ChromeCanvas::NO_ELLIPSIS))
+      f |= DT_END_ELLIPSIS;
+  }
+
+  // vertical alignment
+  if (flags & ChromeCanvas::TEXT_VALIGN_TOP)
+    f |= DT_TOP;
+  else if (flags & ChromeCanvas::TEXT_VALIGN_BOTTOM)
+    f |= DT_BOTTOM;
+  else
+    f |= DT_VCENTER;
+
+  // horizontal alignment
+  if (flags & ChromeCanvas::TEXT_ALIGN_CENTER)
+    f |= DT_CENTER;
+  else if (flags & ChromeCanvas::TEXT_ALIGN_RIGHT)
+    f |= DT_RIGHT;
+  else
+    f |= DT_LEFT;
+
+  // In order to make sure RTL/BiDi strings are rendered correctly, we must
+  // pass the flag DT_RTLREADING to DrawText (when the locale's language is
+  // a right-to-left language) so that Windows does the right thing.
+  //
+  // In addition to correctly displaying text containing both RTL and LTR
+  // elements (for example, a string containing a telephone number within a
+  // sentence in Hebrew, or a sentence in Hebrew that contains a word in
+  // English) this flag also makes sure that if there is not enough space to
+  // display the entire string, the ellipsis is displayed on the left hand side
+  // of the truncated string and not on the right hand side.
+  if (l10n_util::GetTextDirection() == l10n_util::RIGHT_TO_LEFT)
+    f |= DT_RTLREADING;
+
+  return f;
+}
+
+}  // namespace
+
+ChromeCanvas::ChromeCanvas(int width, int height, bool is_opaque)
+    : gfx::PlatformCanvasWin(width, height, is_opaque) {
+}
+
+ChromeCanvas::ChromeCanvas() : gfx::PlatformCanvasWin() {
+}
+
+ChromeCanvas::~ChromeCanvas() {
+}
+
+bool ChromeCanvas::GetClipRect(gfx::Rect* r) {
+  SkRect clip;
+  if (!getClipBounds(&clip)) {
+    if (r)
+      r->SetRect(0, 0, 0, 0);
+    return false;
+  }
+  r->SetRect(SkScalarRound(clip.fLeft), SkScalarRound(clip.fTop),
+             SkScalarRound(clip.fRight - clip.fLeft),
+             SkScalarRound(clip.fBottom - clip.fTop));
+  return true;
+}
+
+bool ChromeCanvas::ClipRectInt(int x, int y, int w, int h) {
+  SkRect new_clip;
+  new_clip.set(SkIntToScalar(x), SkIntToScalar(y),
+               SkIntToScalar(x + w), SkIntToScalar(y + h));
+  return clipRect(new_clip);
+}
+
+bool ChromeCanvas::IntersectsClipRectInt(int x, int y, int w, int h) {
+  SkRect clip;
+  return getClipBounds(&clip) &&
+      clip.intersect(SkIntToScalar(x), SkIntToScalar(y), SkIntToScalar(x + w),
+                     SkIntToScalar(y + h));
+}
+
+void ChromeCanvas::TranslateInt(int x, int y) {
+  translate(SkIntToScalar(x), SkIntToScalar(y));
+}
+
+void ChromeCanvas::ScaleInt(int x, int y) {
+  scale(SkIntToScalar(x), SkIntToScalar(y));
+}
+
+void ChromeCanvas::FillRectInt(const SkColor& color,
+                               int x, int y, int w, int h) {
+  SkPaint paint;
+  paint.setColor(color);
+  paint.setStyle(SkPaint::kFill_Style);
+  paint.setPorterDuffXfermode(SkPorterDuff::kSrcOver_Mode);
+  FillRectInt(x, y, w, h, paint);
+}
+
+void ChromeCanvas::FillRectInt(int x, int y, int w, int h,
+                               const SkPaint& paint) {
+  SkRect rc = {SkIntToScalar(x), SkIntToScalar(y),
+               SkIntToScalar(x + w), SkIntToScalar(y + h) };
+  drawRect(rc, paint);
+}
+
+void ChromeCanvas::DrawRectInt(const SkColor& color,
+                               int x, int y, int w, int h) {
+  DrawRectInt(color, x, y, w, h, SkPorterDuff::kSrcOver_Mode);
+}
+
+void ChromeCanvas::DrawRectInt(const SkColor& color, int x, int y, int w, int h,
+                               SkPorterDuff::Mode mode) {
+  SkPaint paint;
+  paint.setColor(color);
+  paint.setStyle(SkPaint::kStroke_Style);
+  // Contrary to the docs, a width of 0 results in nothing.
+  paint.setStrokeWidth(SkIntToScalar(1));
+  paint.setPorterDuffXfermode(mode);
+
+  SkRect rc = {SkIntToScalar(x), SkIntToScalar(y),
+               SkIntToScalar(x + w), SkIntToScalar(y + h) };
+  drawRect(rc, paint);
+}
+
+void ChromeCanvas::DrawFocusRect(int x, int y, int width, int height) {
+  // Create a 2D bitmap containing alternating on/off pixels - we do this
+  // so that you never get two pixels of the same color around the edges
+  // of the focus rect (this may mean that opposing edges of the rect may
+  // have a dot pattern out of phase to each other).
+  static SkBitmap* dots = NULL;
+  if (!dots) {
+    int col_pixels = 32;
+    int row_pixels = 32;
+
+    dots = new SkBitmap;
+    dots->setConfig(SkBitmap::kARGB_8888_Config, col_pixels, row_pixels);
+    dots->allocPixels();
+    dots->eraseARGB(0, 0, 0, 0);
+
+    uint32_t* dot = dots->getAddr32(0, 0);
+    for (int i = 0; i < row_pixels; i++) {
+      for (int u = 0; u < col_pixels; u++) {
+        if ((u % 2 + i % 2) % 2 != 0) {
+          dot[i * row_pixels + u] = SK_ColorGRAY;
+        }
+      }
+    }
+  }
+
+  // First the horizontal lines.
+
+  // Make a shader for the bitmap with an origin of the box we'll draw. This
+  // shader is refcounted and will have an initial refcount of 1.
+  SkShader* shader = SkShader::CreateBitmapShader(
+      *dots, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
+  // Assign the shader to the paint & release our reference. The paint will
+  // now own the shader and the shader will be destroyed when the paint goes
+  // out of scope.
+  SkPaint paint;
+  paint.setShader(shader);
+  shader->unref();
+
+  SkRect rect;
+  rect.set(SkIntToScalar(x), SkIntToScalar(y),
+           SkIntToScalar(x + width), SkIntToScalar(y + 1));
+  drawRect(rect, paint);
+  rect.set(SkIntToScalar(x), SkIntToScalar(y + height - 1),
+           SkIntToScalar(x + width), SkIntToScalar(y + height));
+  drawRect(rect, paint);
+
+  rect.set(SkIntToScalar(x), SkIntToScalar(y),
+           SkIntToScalar(x + 1), SkIntToScalar(y + height));
+  drawRect(rect, paint);
+  rect.set(SkIntToScalar(x + width - 1), SkIntToScalar(y),
+           SkIntToScalar(x + width), SkIntToScalar(y + height));
+  drawRect(rect, paint);
+}
+
+void ChromeCanvas::DrawBitmapInt(const SkBitmap& bitmap, int x, int y) {
+  drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y));
+}
+
+void ChromeCanvas::DrawBitmapInt(const SkBitmap& bitmap, int x, int y,
+                                 const SkPaint& paint) {
+  drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y), &paint);
+}
+
+void ChromeCanvas::DrawBitmapInt(const SkBitmap& bitmap, int src_x, int src_y,
+                                 int src_w, int src_h, int dest_x, int dest_y,
+                                 int dest_w, int dest_h,
+                                 bool filter) {
+  SkPaint p;
+  DrawBitmapInt(bitmap, src_x, src_y, src_w, src_h, dest_x, dest_y,
+                dest_w, dest_h, filter, p);
+}
+
+void ChromeCanvas::DrawBitmapInt(const SkBitmap& bitmap, int src_x, int src_y,
+                                 int src_w, int src_h, int dest_x, int dest_y,
+                                 int dest_w, int dest_h,
+                                 bool filter, const SkPaint& paint) {
+  DLOG_ASSERT(src_x + src_w < std::numeric_limits<int16_t>::max() &&
+              src_y + src_h < std::numeric_limits<int16_t>::max());
+  if (src_w <= 0 || src_h <= 0 || dest_w <= 0 || dest_h <= 0) {
+    NOTREACHED() << "Attempting to draw bitmap to/from an empty rect!";
+    return;
+  }
+
+  if (!IntersectsClipRectInt(dest_x, dest_y, dest_w, dest_h))
+    return;
+
+  SkRect dest_rect = { SkIntToScalar(dest_x),
+                       SkIntToScalar(dest_y),
+                       SkIntToScalar(dest_x + dest_w),
+                       SkIntToScalar(dest_y + dest_h) };
+
+  if (src_w == dest_w && src_h == dest_h) {
+    // Workaround for apparent bug in Skia that causes image to occasionally
+    // shift.
+    SkIRect src_rect = { src_x, src_y, src_x + src_w, src_y + src_h };
+    drawBitmapRect(bitmap, &src_rect, dest_rect, &paint);
+    return;
+  }
+
+  // Make a bitmap shader that contains the bitmap we want to draw. This is
+  // basically what SkCanvas.drawBitmap does internally, but it gives us
+  // more control over quality and will use the mipmap in the source image if
+  // it has one, whereas drawBitmap won't.
+  SkShader* shader = SkShader::CreateBitmapShader(bitmap,
+                                                  SkShader::kRepeat_TileMode,
+                                                  SkShader::kRepeat_TileMode);
+  SkMatrix shader_scale;
+  shader_scale.setScale(
+      SkFloatToScalar(static_cast<float>(dest_w) / src_w),
+      SkFloatToScalar(static_cast<float>(dest_h) / src_h));
+  shader_scale.postTranslate(SkIntToScalar(dest_x - src_x),
+                             SkIntToScalar(dest_y - src_y));
+  shader->setLocalMatrix(shader_scale);
+
+  // Set up our paint to use the shader & release our reference (now just owned
+  // by the paint).
+  SkPaint p(paint);
+  p.setFilterBitmap(filter);
+  p.setShader(shader);
+  shader->unref();
+
+  // The rect will be filled by the bitmap.
+  drawRect(dest_rect, p);
+}
+
+// static
+void ChromeCanvas::SizeStringInt(const std::wstring& text,
+                                 const ChromeFont& font,
+                                 int *width, int *height, int flags) {
+  HDC dc = GetDC(NULL);
+  HFONT old_font = static_cast<HFONT>(SelectObject(dc, font.hfont()));
+  RECT b;
+  b.left = 0;
+  b.top = 0;
+  b.right = *width;
+  if (b.right == 0 && !text.empty()) {
+    // Width needs to be at least 1 or else DoDrawText will not resize it.
+    b.right = 1;
+  }
+  b.bottom = *height;
+  DoDrawText(dc, text, &b, ComputeFormatFlags(flags) | DT_CALCRECT);
+
+  // Restore the old font. This way we don't have to worry if the caller
+  // deletes the font and the DC lives longer.
+  SelectObject(dc, old_font);
+  *width = b.right;
+  *height = b.bottom;
+
+  ReleaseDC(NULL, dc);
+}
+
+void ChromeCanvas::DrawStringInt(const std::wstring& text, HFONT font,
+                                 const SkColor& color, int x, int y, int w,
+                                 int h, int flags) {
+  if (!IntersectsClipRectInt(x, y, w, h))
+    return;
+
+  getTopPlatformDevice().prepareForGDI(x, y, w, h);
+  RECT text_bounds = { x, y, x + w, y + h };
+  HDC dc = beginPlatformPaint();
+  SetBkMode(dc, TRANSPARENT);
+  HFONT old_font = (HFONT)SelectObject(dc, font);
+  COLORREF brush_color = RGB(SkColorGetR(color), SkColorGetG(color),
+                             SkColorGetB(color));
+  SetTextColor(dc, brush_color);
+
+  int f = ComputeFormatFlags(flags);
+  DoDrawText(dc, text, &text_bounds, f);
+  endPlatformPaint();
+
+  // Restore the old font. This way we don't have to worry if the caller
+  // deletes the font and the DC lives longer.
+  SelectObject(dc, old_font);
+  getTopPlatformDevice().postProcessGDI(x, y, w, h);
+}
+
+void ChromeCanvas::DrawStringInt(const std::wstring& text,
+                                 const ChromeFont& font,
+                                 const SkColor& color,
+                                 int x, int y,
+                                 int w, int h) {
+  DrawStringInt(text, font, color, x, y, w, h,
+                l10n_util::DefaultCanvasTextAlignment());
+}
+
+void ChromeCanvas::DrawStringInt(const std::wstring& text,
+                                 const ChromeFont& font,
+                                 const SkColor& color,
+                                 int x, int y, int w, int h, int flags) {
+  DrawStringInt(text, font.hfont(), color, x, y, w, h, flags);
+}
+
+void ChromeCanvas::TileImageInt(const SkBitmap& bitmap,
+                                int x, int y, int w, int h,
+                                SkPorterDuff::Mode mode) {
+  if (!IntersectsClipRectInt(x, y, w, h))
+    return;
+
+  SkPaint paint;
+  int bitmap_width = bitmap.width();
+  int bitmap_height = bitmap.height();
+
+  SkShader* shader = SkShader::CreateBitmapShader(bitmap,
+                                                  SkShader::kRepeat_TileMode,
+                                                  SkShader::kRepeat_TileMode);
+  paint.setShader(shader);
+  paint.setPorterDuffXfermode(mode);
+
+  // CreateBitmapShader returns a Shader with a reference count of one, we
+  // need to unref after paint takes ownership of the shader.
+  shader->unref();
+  save();
+  translate(SkIntToScalar(x), SkIntToScalar(y));
+  ClipRectInt(0, 0, w, h);
+  drawPaint(paint);
+  restore();
+}
+
+void ChromeCanvas::TileImageInt(const SkBitmap& bitmap,
+                                int x, int y, int w, int h) {
+  TileImageInt(bitmap, x, y, w, h, SkPorterDuff::kSrcOver_Mode);
+}
+
+SkBitmap ChromeCanvas::ExtractBitmap() {
+  const SkBitmap& device_bitmap = getDevice()->accessBitmap(false);
+
+  // Make a bitmap to return, and a canvas to draw into it. We don't just want
+  // to call extractSubset or the copy constuctor, since we want an actual copy
+  // of the bitmap.
+  SkBitmap result;
+  device_bitmap.copyTo(&result, SkBitmap::kARGB_8888_Config);
+  return result;
+}