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randr: Rework panning area verification

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This commit is contained in:
Matthias Hopf 2008-12-04 16:55:14 +01:00
parent 219c26ce0c
commit bad118ace6
1 changed files with 73 additions and 25 deletions
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98
hw/xfree86/modes/xf86RandR12.c
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@ -88,40 +88,88 @@ xf86RandR12ModeRefresh (DisplayModePtr mode)
return (int) (mode->Clock * 1000.0 / mode->HTotal / mode->VTotal + 0.5);
}
/* Adapt panning area; return TRUE if panning area was valid without adaption */
static int
xf86RandR13VerifyPanningArea (xf86CrtcPtr crtc, int screenWidth, int screenHeight)
{
int ret = TRUE;
if (crtc->version < 2)
return FALSE;
if (crtc->panningTotalArea.x2 <= crtc->panningTotalArea.x1 ||
crtc->panningTotalArea.y2 <= crtc->panningTotalArea.y1) {
memset (&crtc->panningTotalArea, 0, sizeof(BoxRec));
memset (&crtc->panningTrackingArea, 0, sizeof(BoxRec));
memset (&crtc->panningBorder, 0, 4*sizeof(INT16));
return TRUE;
if (crtc->panningTotalArea.x2 <= crtc->panningTotalArea.x1) {
/* Panning in X is disabled */
if (crtc->panningTotalArea.x1 || crtc->panningTotalArea.x2)
/* Illegal configuration -> fail/disable */
ret = FALSE;
crtc->panningTotalArea.x1 = crtc->panningTotalArea.x2 = 0;
crtc->panningTrackingArea.x1 = crtc->panningTrackingArea.x2 = 0;
crtc->panningBorder[0] = crtc->panningBorder[2] = 0;
} else {
/* Panning in X is enabled */
if (crtc->panningTotalArea.x1 < 0) {
/* Panning region outside screen -> move inside */
crtc->panningTotalArea.x2 -= crtc->panningTotalArea.x1;
crtc->panningTotalArea.x1 = 0;
ret = FALSE;
}
if (crtc->panningTotalArea.x2 < crtc->panningTotalArea.x1 + crtc->mode.HDisplay) {
/* Panning region smaller than displayed area -> crop to displayed area */
crtc->panningTotalArea.x2 = crtc->panningTotalArea.x1 + crtc->mode.HDisplay;
ret = FALSE;
}
if (crtc->panningTotalArea.x2 > screenWidth) {
/* Panning region larger than screen -> move inside, then crop to screen */
crtc->panningTotalArea.x1 -= crtc->panningTotalArea.x2 - screenWidth;
crtc->panningTotalArea.x2 = screenWidth;
ret = FALSE;
if (crtc->panningTotalArea.x1 < 0)
crtc->panningTotalArea.x1 = 0;
}
if (crtc->panningBorder[0] + crtc->panningBorder[2] > crtc->mode.HDisplay) {
/* Borders too large -> set to 0 */
crtc->panningBorder[0] = crtc->panningBorder[2] = 0;
ret = FALSE;
}
}
if (crtc->panningTotalArea.x2 <= crtc->panningTotalArea.x1 ||
crtc->panningTotalArea.y2 <= crtc->panningTotalArea.y1 ||
crtc->panningTotalArea.x1 < 0 ||
crtc->panningTotalArea.y1 < 0 ||
crtc->panningTotalArea.x2 < crtc->panningTotalArea.x1 + crtc->mode.HDisplay ||
crtc->panningTotalArea.y2 < crtc->panningTotalArea.y1 + crtc->mode.VDisplay ||
crtc->panningTotalArea.x2 > screenWidth ||
crtc->panningTotalArea.y2 > screenHeight)
{
memset (&crtc->panningTotalArea, 0, sizeof(BoxRec));
memset (&crtc->panningTrackingArea, 0, sizeof(BoxRec));
memset (&crtc->panningBorder, 0, 4*sizeof(INT16));
return FALSE;
if (crtc->panningTotalArea.y2 <= crtc->panningTotalArea.y1) {
/* Panning in Y is disabled */
if (crtc->panningTotalArea.y1 || crtc->panningTotalArea.y2)
/* Illegal configuration -> fail/disable */
ret = FALSE;
crtc->panningTotalArea.y1 = crtc->panningTotalArea.y2 = 0;
crtc->panningTrackingArea.y1 = crtc->panningTrackingArea.y2 = 0;
crtc->panningBorder[1] = crtc->panningBorder[3] = 0;
} else {
/* Panning in Y is enabled */
if (crtc->panningTotalArea.y1 < 0) {
/* Panning region outside screen -> move inside */
crtc->panningTotalArea.y2 -= crtc->panningTotalArea.y1;
crtc->panningTotalArea.y1 = 0;
ret = FALSE;
}
if (crtc->panningTotalArea.y2 < crtc->panningTotalArea.y1 + crtc->mode.VDisplay) {
/* Panning region smaller than displayed area -> crop to displayed area */
crtc->panningTotalArea.y2 = crtc->panningTotalArea.y1 + crtc->mode.VDisplay;
ret = FALSE;
}
if (crtc->panningTotalArea.y2 > screenHeight) {
/* Panning region larger than screen -> move inside, then crop to screen */
crtc->panningTotalArea.y1 -= crtc->panningTotalArea.y2 - screenHeight;
crtc->panningTotalArea.y2 = screenHeight;
ret = FALSE;
if (crtc->panningTotalArea.y1 < 0)
crtc->panningTotalArea.y1 = 0;
}
if (crtc->panningBorder[1] + crtc->panningBorder[3] > crtc->mode.VDisplay) {
/* Borders too large -> set to 0 */
crtc->panningBorder[1] = crtc->panningBorder[3] = 0;
ret = FALSE;
}
}
if (crtc->panningBorder[0] + crtc->panningBorder[2] > crtc->mode.HDisplay ||
crtc->panningBorder[1] + crtc->panningBorder[3] > crtc->mode.VDisplay) {
memset (&crtc->panningBorder, 0, 4*sizeof(INT16));
return FALSE;
}
return TRUE;
return ret;
}
static void