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add a function to look for a Visual matching an image format b=576143 r=jrmuizel

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--HG--
extra : rebase_source : bc38c8223dc91c2ec6a05a35e6ba43863c77dd7b
This commit is contained in:
Karl Tomlinson 2010-07-23 10:28:56 +12:00
parent fb689d79eb
commit 1094a22411
2 changed files with 53 additions and 19 deletions
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71
gfx/thebes/gfxXlibSurface.cpp
View File

@ -421,6 +421,56 @@ gfxXlibSurface::DepthOfVisual(const Screen* screen, const Visual* visual)
return 0;
}
/* static */
Visual*
gfxXlibSurface::FindVisual(Screen *screen, gfxImageFormat format)
{
int depth;
unsigned long red_mask, green_mask, blue_mask;
switch (format) {
case ImageFormatARGB32:
depth = 32;
red_mask = 0xff0000;
green_mask = 0xff00;
blue_mask = 0xff;
break;
case ImageFormatRGB24:
depth = 24;
red_mask = 0xff0000;
green_mask = 0xff00;
blue_mask = 0xff;
break;
case ImageFormatRGB16_565:
depth = 16;
red_mask = 0xf800;
green_mask = 0x7e0;
blue_mask = 0x1f;
break;
case ImageFormatA8:
case ImageFormatA1:
default:
return NULL;
}
for (int d = 0; d < screen->ndepths; d++) {
const Depth& d_info = screen->depths[d];
if (d_info.depth != depth)
continue;
for (int v = 0; v < d_info.nvisuals; v++) {
Visual* visual = &d_info.visuals[v];
if (visual->c_class == TrueColor &&
visual->red_mask == red_mask &&
visual->green_mask == green_mask &&
visual->blue_mask == blue_mask)
return visual;
}
}
return NULL;
}
/* static */
XRenderPictFormat*
gfxXlibSurface::FindRenderFormat(Display *dpy, gfxImageFormat format)
@ -428,40 +478,23 @@ gfxXlibSurface::FindRenderFormat(Display *dpy, gfxImageFormat format)
switch (format) {
case ImageFormatARGB32:
return XRenderFindStandardFormat (dpy, PictStandardARGB32);
break;
case ImageFormatRGB24:
return XRenderFindStandardFormat (dpy, PictStandardRGB24);
break;
case ImageFormatRGB16_565: {
// PictStandardRGB16_565 is not standard Xrender format
// we should try to find related visual
// and find xrender format by visual
Visual *visual = NULL;
Screen *screen = DefaultScreenOfDisplay(dpy);
int j;
for (j = 0; j < screen->ndepths; j++) {
Depth *d = &screen->depths[j];
if (d->depth == 16 && d->nvisuals && &d->visuals[0]) {
if (d->visuals[0].red_mask == 0xf800 &&
d->visuals[0].green_mask == 0x7e0 &&
d->visuals[0].blue_mask == 0x1f)
visual = &d->visuals[0];
break;
}
}
Visual *visual = FindVisual(DefaultScreenOfDisplay(dpy), format);
if (!visual)
return NULL;
return XRenderFindVisualFormat(dpy, visual);
break;
}
case ImageFormatA8:
return XRenderFindStandardFormat (dpy, PictStandardA8);
break;
case ImageFormatA1:
return XRenderFindStandardFormat (dpy, PictStandardA1);
break;
default:
return NULL;
break;
}
return (XRenderPictFormat*)NULL;

1
gfx/thebes/gfxXlibSurface.h
View File

@ -83,6 +83,7 @@ public:
Drawable XDrawable() { return mDrawable; }
static int DepthOfVisual(const Screen* screen, const Visual* visual);
static Visual* FindVisual(Screen* screen, gfxImageFormat format);
static XRenderPictFormat *FindRenderFormat(Display *dpy, gfxImageFormat format);
// take ownership of a passed-in Pixmap, calling XFreePixmap on it