Implement platform-independent DrawGlyphs for Flash.

webkit/plugins/ppapi/ppb_flash_impl_linux.cc

-// Copyright (c) 2011 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 "webkit/plugins/ppapi/ppb_flash_impl.h"
-
-#include "ppapi/c/pp_point.h"
-#include "ppapi/c/pp_rect.h"
-#include "ppapi/c/dev/ppb_font_dev.h"
-#include "ppapi/shared_impl/var.h"
-#include "ppapi/thunk/enter.h"
-#include "skia/ext/platform_canvas.h"
-#include "third_party/skia/include/core/SkCanvas.h"
-#include "third_party/skia/include/core/SkMatrix.h"
-#include "third_party/skia/include/core/SkPaint.h"
-#include "third_party/skia/include/core/SkPoint.h"
-#include "third_party/skia/include/core/SkTemplates.h"
-#include "third_party/skia/include/core/SkTypeface.h"
-#include "webkit/plugins/ppapi/ppb_image_data_impl.h"
-
-using ppapi::StringVar;
-using ppapi::thunk::EnterResource;
-using ppapi::thunk::PPB_ImageData_API;
-
-namespace webkit {
-namespace ppapi {
-
-PP_Bool PPB_Flash_Impl::DrawGlyphs(PP_Instance,
-                                   PP_Resource pp_image_data,
-                                   const PP_FontDescription_Dev* font_desc,
-                                   uint32_t color,
-                                   PP_Point position,
-                                   PP_Rect clip,
-                                   const float transformation[3][3],
-                                   uint32_t glyph_count,
-                                   const uint16_t glyph_indices[],
-                                   const PP_Point glyph_advances[]) {
-  EnterResource<PPB_ImageData_API> enter(pp_image_data, true);
-  if (enter.failed())
-    return PP_FALSE;
-  PPB_ImageData_Impl* image_resource =
-      static_cast<PPB_ImageData_Impl*>(enter.object());
-
-  ImageDataAutoMapper mapper(image_resource);
-  if (!mapper.is_valid())
-    return PP_FALSE;
-
-  // Set up the typeface.
-  StringVar* face_name = StringVar::FromPPVar(font_desc->face);
-  if (!face_name)
-    return PP_FALSE;
-  int style = SkTypeface::kNormal;
-  if (font_desc->weight >= PP_FONTWEIGHT_BOLD)
-    style |= SkTypeface::kBold;
-  if (font_desc->italic)
-    style |= SkTypeface::kItalic;
-  SkTypeface* typeface =
-      SkTypeface::CreateFromName(face_name->value().c_str(),
-                                 static_cast<SkTypeface::Style>(style));
-  if (!typeface)
-    return PP_FALSE;
-
-  // Set up the canvas.
-  SkCanvas* canvas = image_resource->mapped_canvas();
-  canvas->save();
-
-  // Clip is applied in pixels before the transform.
-  SkRect clip_rect = { clip.point.x, clip.point.y,
-                       clip.point.x + clip.size.width,
-                       clip.point.y + clip.size.height };
-  canvas->clipRect(clip_rect);
-
-  // -- Do not return early below this. The canvas needs restoring and the
-  // typeface will leak if it's not assigned to the paint (it's refcounted and
-  // the refcount is currently 0).
-
-  // Convert & set the matrix.
-  SkMatrix matrix;
-  matrix.set(SkMatrix::kMScaleX, SkFloatToScalar(transformation[0][0]));
-  matrix.set(SkMatrix::kMSkewX,  SkFloatToScalar(transformation[0][1]));
-  matrix.set(SkMatrix::kMTransX, SkFloatToScalar(transformation[0][2]));
-  matrix.set(SkMatrix::kMSkewY,  SkFloatToScalar(transformation[1][0]));
-  matrix.set(SkMatrix::kMScaleY, SkFloatToScalar(transformation[1][1]));
-  matrix.set(SkMatrix::kMTransY, SkFloatToScalar(transformation[1][2]));
-  matrix.set(SkMatrix::kMPersp0, SkFloatToScalar(transformation[2][0]));
-  matrix.set(SkMatrix::kMPersp1, SkFloatToScalar(transformation[2][1]));
-  matrix.set(SkMatrix::kMPersp2, SkFloatToScalar(transformation[2][2]));
-  canvas->concat(matrix);
-
-  SkPaint paint;
-  paint.setColor(color);
-  paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
-  paint.setAntiAlias(true);
-  paint.setHinting(SkPaint::kFull_Hinting);
-  paint.setTextSize(SkIntToScalar(font_desc->size));
-  paint.setTypeface(typeface);  // Takes a ref and manages lifetime.
-  paint.setSubpixelText(true);
-  paint.setLCDRenderText(true);
-
-  SkScalar x = SkIntToScalar(position.x);
-  SkScalar y = SkIntToScalar(position.y);
-
-  // Build up the skia advances.
-  SkAutoSTMalloc<32, SkPoint> storage(glyph_count);
-  SkPoint* sk_positions = storage.get();
-  for (uint32_t i = 0; i < glyph_count; i++) {
-    sk_positions[i].set(x, y);
-    x += SkFloatToScalar(glyph_advances[i].x);
-    y += SkFloatToScalar(glyph_advances[i].y);
-  }
-
-  canvas->drawPosText(glyph_indices, glyph_count * 2, sk_positions, paint);
-
-  canvas->restore();
-  return PP_TRUE;
-}
-
-}  // namespace ppapi
-}  // namespace webkit