runtime/embedders/openglui/common/canvas_context.cc

// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

#include "embedders/openglui/common/canvas_context.h"

#include <ctype.h>
#include <string.h>

#include "embedders/openglui/common/support.h"

CanvasContext::CanvasContext(int16_t widthp, int16_t heightp)
  : canvas_(NULL),
    width_(widthp),
    height_(heightp),
    imageSmoothingEnabled_(true),
    state_(NULL) {
}

CanvasContext::~CanvasContext() {
  delete state_;
  delete canvas_;
}

void CanvasContext::Create() {
  canvas_ = graphics->CreateCanvas();
  state_ = new CanvasState(canvas_);
}

void CanvasContext::DrawImage(const char* src_url,
                              int sx, int sy,
                              bool has_src_dimensions, int sw, int sh,
                              int dx, int dy,
                              bool has_dst_dimensions, int dw, int dh) {
  SkBitmap bm;
  // TODO(gram): We need a way to remap URLs to local file names.
  // For now I am just using the characters after the last '/'.
  // Note also that if we want to support URLs and network fetches,
  // then we introduce more complexity; this can't just be an URL.
  int pos = strlen(src_url);
  while (--pos >= 0 && src_url[pos] != '/');
  const char *path = src_url + pos + 1;
  if (!SkImageDecoder::DecodeFile(path, &bm)) {
    LOGI("Image decode of %s failed", path);
  } else {
    LOGI("Decode image: width=%d,height=%d", bm.width(), bm.height());
    if (!has_src_dimensions) {
      sw = bm.width();
      sh = bm.height();
    }
    if (!has_dst_dimensions) {
      dw = bm.width();
      dh = bm.height();
    }
    state_->DrawImage(bm, sx, sy, sw, sh, dx, dy, dw, dh);
  }
}

void CanvasContext::ClearRect(float left, float top,
                              float width, float height) {
  SkPaint paint;
  paint.setStyle(SkPaint::kFill_Style);
  paint.setColor(0xFFFFFFFF);
  canvas_->drawRectCoords(left, top, left + width, top + height, paint);
}