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/*
* Copyright (c) 2008, 2009, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ThemeHelperWin_h
#define ThemeHelperWin_h
#include "TransformationMatrix.h"
#include "ImageBuffer.h"
#include "IntRect.h"
#include <wtf/OwnPtr.h>
namespace WebCore {
class GraphicsContext;
class IntRect;
// Helps drawing theme elements like buttons and scroll bars. This will handle
// translations and scalings that Windows might not, by either making Windows
// draw the appropriate sized control, or by rendering it into an off-screen
// context and transforming it ourselves.
class ThemeHelperWin {
enum Type {
// Use the original canvas with no changes. This is the normal mode.
ORIGINAL,
// Use the original canvas but scale the rectangle of the control so
// that it will be the correct size, undoing any scale already on the
// canvas. This will have the effect of just drawing the control bigger
// or smaller and not actually expanding or contracting the pixels in
// it. This usually looks better.
SCALE,
// Make a copy of the control and then transform it ourselves after
// Windows draws it. This allows us to get complex effects.
COPY,
};
public:
// Prepares drawing a control with the given rect to the given context.
ThemeHelperWin(GraphicsContext* context, const IntRect& rect);
~ThemeHelperWin();
// Returns the context to draw the control into, which may be the original
// or the copy, depending on the mode.
GraphicsContext* context()
{
return m_newBuffer.get() ? m_newBuffer->context() : m_orgContext;
}
// Returns the rectangle in which to draw into the canvas() by Windows.
const IntRect& rect() { return m_rect; }
private:
Type m_type;
// The original canvas to wrote to. Not owned by this class.
GraphicsContext* m_orgContext;
TransformationMatrix m_orgMatrix;
IntRect m_orgRect;
// When m_type == COPY, this will be a new surface owned by this class that
// represents the copy.
OwnPtr<ImageBuffer> m_newBuffer;
// The control rectangle in the coordinate space of canvas().
IntRect m_rect;
};
} // namespace WebCore
#endif // ThemeHelperWin_h
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