gfx/thebes/gfxQtNativeRenderer.h

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  37
  38 #ifndef GFXQTNATIVERENDER_H_
  39 #define GFXQTNATIVERENDER_H_
  40
  41 #include "gfxColor.h"
  42 #include "gfxASurface.h"
  43 #include "gfxContext.h"
  44 #include "gfxXlibSurface.h"
  45 #include "nsRect.h"
  46
  47 class QRect;
  48
  49 /**
  50  * This class lets us take code that draws into an Xlib surface 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 DrawWithXlib(gfxXlibSurface *xsurf,
  66             nsIntPoint offset,
  67             nsIntRect* clipRects, PRUint32 numClipRects) = 0;
  68
  69     enum {
  70         // If set, then Draw() is opaque, i.e., every pixel in the intersection
  71         // of the clipRect and (offset.x,offset.y,bounds.width,bounds.height)
  72         // will be set and there is no dependence on what the existing pixels
  73         // in the drawable are set to.
  74         DRAW_IS_OPAQUE = 0x01,
  75         // If set, then numClipRects can be zero or one
  76         DRAW_SUPPORTS_CLIP_RECT = 0x04,
  77         // If set, then numClipRects can be any value. If neither this
  78         // nor CLIP_RECT are set, then numClipRects will be zero
  79         DRAW_SUPPORTS_CLIP_LIST = 0x08,
  80         // If set, then the visual passed in can be any visual, otherwise the
  81         // visual passed in must be the default visual for dpy's default screen
  82         DRAW_SUPPORTS_ALTERNATE_VISUAL = 0x10,
  83         // If set, then the Screen 'screen' in the callback can be different
  84         // from the default Screen of the display passed to 'Draw' and can be
  85         // on a different display.
  86         DRAW_SUPPORTS_ALTERNATE_SCREEN = 0x20
  87     };
  88
  89     struct DrawOutput {
  90         nsRefPtr<gfxASurface> mSurface;
  91         PRPackedBool mUniformAlpha;
  92         PRPackedBool mUniformColor;
  93         gfxRGBA      mColor;
  94     };
  95
  96     /**
  97      * @param flags see above
  98      * @param size Draw()'s drawing is guaranteed to be restricted to
  99      * the rectangle (offset.x,offset.y,size.width,size.height)
 100      * @param dpy a display to use for the drawing if ctx doesn't have one
 101      * @param resultSurface if non-null, we will try to capture a copy of the
 102      * rendered image into a surface similar to the surface of ctx; if
 103      * successful, a pointer to the new gfxASurface is stored in *resultSurface,
 104      * otherwise *resultSurface is set to nsnull.
 105      */
 106     nsresult Draw(gfxContext* ctx, nsIntSize size,
 107                   PRUint32 flags, Screen* screen, Visual* visual,
 108                   DrawOutput* output);
 109 };
 110
 111 #endif /*GFXQTNATIVERENDER_H_*/