gfx/thebes/public/gfxQtNativeRenderer.h

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  37
  38 #ifndef GFXQTNATIVERENDER_H_
  39 #define GFXQTNATIVERENDER_H_
  40
  41 #include "gfxColor.h"
  42
  43 class gfxASurface;
  44 class gfxContext;
  45
  46 class QWidget;
  47 class QRect;
  48
  49 /**
  50  * This class lets us take code that draws into an Qt drawable and lets us
  51  * use it to draw into any Thebes context. The user should subclass this class,
  52  * override NativeDraw, and then call Draw(). The drawing will be subjected
  53  * to all Thebes transformations, clipping etc.
  54  */
  55 class THEBES_API gfxQtNativeRenderer {
  56 public:
  57     /**
  58      * Perform the native drawing.
  59      * @param offsetX draw at this offset into the given drawable
  60      * @param offsetY draw at this offset into the given drawable
  61      * @param clipRects an array of rects; clip to the union
  62      * @param numClipRects the number of rects in the array, or zero if
  63      * no clipping is required
  64      */
  65     virtual nsresult NativeDraw(QWidget * drawable, short offsetX,
  66             short offsetY, QRect * clipRects, PRUint32 numClipRects) = 0;
  67
  68     enum {
  69         // If set, then Draw() is opaque, i.e., every pixel in the intersection
  70         // of the clipRect and (offset.x,offset.y,bounds.width,bounds.height)
  71         // will be set and there is no dependence on what the existing pixels
  72         // in the drawable are set to.
  73         DRAW_IS_OPAQUE = 0x01,
  74         // If set, then offset may be non-zero; if not set, then Draw() can
  75         // only be called with offset==(0,0)
  76         DRAW_SUPPORTS_OFFSET = 0x02,
  77         // If set, then numClipRects can be zero or one
  78         DRAW_SUPPORTS_CLIP_RECT = 0x04,
  79         // If set, then numClipRects can be any value. If neither this
  80         // nor CLIP_RECT are set, then numClipRects will be zero
  81         DRAW_SUPPORTS_CLIP_LIST = 0x08,
  82         // If set, then the visual passed in can be any visual, otherwise the
  83         // visual passed in must be the default visual for dpy's default screen
  84         DRAW_SUPPORTS_NONDEFAULT_VISUAL = 0x10,
  85         // If set, then the Screen 'screen' in the callback can be different
  86         // from the default Screen of the display passed to 'Draw' and can be
  87         // on a different display.
  88         DRAW_SUPPORTS_ALTERNATE_SCREEN = 0x20
  89     };
  90
  91     struct DrawOutput {
  92         nsRefPtr<gfxASurface> mSurface;
  93         PRPackedBool mUniformAlpha;
  94         PRPackedBool mUniformColor;
  95         gfxRGBA      mColor;
  96     };
  97
  98     /**
  99      * @param flags see above
 100      * @param bounds Draw()'s drawing is guaranteed to be restricted to
 101      * the rectangle (offset.x,offset.y,bounds.width,bounds.height)
 102      * @param dpy a display to use for the drawing if ctx doesn't have one
 103      * @param resultSurface if non-null, we will try to capture a copy of the
 104      * rendered image into a surface similar to the surface of ctx; if
 105      * successful, a pointer to the new gfxASurface is stored in *resultSurface,
 106      * otherwise *resultSurface is set to nsnull.
 107      */
 108     nsresult Draw(gfxContext* ctx, int width, int height,
 109                   PRUint32 flags, DrawOutput* output);
 110 };
 111
 112 #endif /*GFXQTNATIVERENDER_H_*/