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118 lines
4.4 KiB
C++
118 lines
4.4 KiB
C++
/*
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Copyright (C) 2013 Birunthan Mohanathas
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef RM_GFX_CANVAS_H_
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#define RM_GFX_CANVAS_H_
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#include "FontCollection.h"
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#include "TextFormat.h"
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#include <Windows.h>
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#include <ole2.h> // For Gdiplus.h.
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#include <GdiPlus.h>
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namespace Gfx {
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enum class Renderer
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{
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GDIP,
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D2D,
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// Attempts to use D2D. If D2D is not available, fallbacks to use GDI+.
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PreferD2D
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};
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// Provides methods for drawing text, bitmaps, etc.
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class __declspec(novtable) Canvas
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{
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public:
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virtual ~Canvas();
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// Creates the canvas using the specified rendering engine. May return nullptr.
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static Canvas* Create(Renderer renderer);
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int GetW() const { return m_W; }
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int GetH() const { return m_H; }
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void SetAccurateText(bool option) { m_AccurateText = option; }
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// Resize the draw area of the Canvas. This function must not be called if BeginDraw() has been
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// called and has not yet been matched by a correspoding call to EndDraw.
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virtual void Resize(int w, int h);
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// BeginDraw() must be matched by a corresponding call to EndDraw(). Drawing functions must be
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// be called only between BeginDraw() and EndDraw().
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virtual bool BeginDraw() = 0;
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virtual void EndDraw() = 0;
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// Allows the use of Gdiplus::Graphics to perform drawing. Must be called between BeginDraw()
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// and EndDraw(). BeginGdiplusGraphicsContext() must be matched by a corresponding call to
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// EndGdiplusGraphicsContext(). While in the Gdiplus context, non-const member functions of
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// this class must not be called.
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virtual Gdiplus::Graphics& BeginGdiplusContext() = 0;
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virtual void EndGdiplusContext() = 0;
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// Returns a read-only DC. Must be called between BeginDraw() and EndDraw(). GetDC() must be
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// matched by a corresponding call to ReleaseDC(). While in the Gdiplus context, non-const
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// member functions of this class must not be called.
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virtual HDC GetDC() = 0;
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virtual void ReleaseDC(HDC dc) = 0;
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// The Create* functions allocate objects specific to this Canvas object.
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virtual FontCollection* CreateFontCollection() = 0;
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virtual TextFormat* CreateTextFormat() = 0;
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virtual bool IsTransparentPixel(int x, int y) = 0;
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virtual void SetTransform(const Gdiplus::Matrix& matrix) = 0;
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virtual void ResetTransform() = 0;
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virtual void RotateTransform(float angle, float x, float y, float dx, float dy) = 0;
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virtual void SetAntiAliasing(bool enable) = 0;
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virtual void SetTextAntiAliasing(bool enable) = 0;
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virtual void Clear(const Gdiplus::Color& color = Gdiplus::Color(0, 0, 0, 0)) = 0;
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virtual void DrawTextW(const WCHAR* str, UINT strLen, const TextFormat& format, Gdiplus::RectF& rect, const Gdiplus::SolidBrush& brush) = 0;
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virtual bool MeasureTextW(const WCHAR* str, UINT strLen, const TextFormat& format, Gdiplus::RectF& rect) = 0;
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virtual bool MeasureTextLinesW(const WCHAR* str, UINT strLen, const TextFormat& format, Gdiplus::RectF& rect, UINT& lines) = 0;
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virtual void DrawBitmap(Gdiplus::Bitmap* bitmap, const Gdiplus::Rect& dstRect, const Gdiplus::Rect& srcRect) = 0;
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virtual void FillRectangle(Gdiplus::Rect& rect, const Gdiplus::SolidBrush& brush) = 0;
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protected:
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Canvas();
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int m_W;
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int m_H;
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// GDI+, by default, includes padding around the string and also has a larger character spacing
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// compared to DirectWrite. In order to minimize diffeences between the text renderers,
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// an option is provided to enable accurate (typographic) text rendering. If set to |true|,
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// it is expected that there is no padding around the text and that the output is similar to
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// the default DirectWrite output. Otherwise, the expected result should be similar to that of
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// non-typographic GDI+.
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bool m_AccurateText;
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private:
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Canvas(const Canvas& other) {}
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};
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} // namespace Gfx
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#endif |