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NV50: switch to fixed point scale factor calculations

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Maarten Maathuis 2008-07-01 16:00:09 +02:00
parent bc32d1798a
commit 2b9c5719c0
1 changed files with 8 additions and 7 deletions
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15
linux-core/nv50_crtc.c
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@ -232,17 +232,18 @@ static int nv50_crtc_set_dither(struct nv50_crtc *crtc)
static void nv50_crtc_calc_scale(struct nv50_crtc *crtc, uint32_t *outX, uint32_t *outY)
{
float hor_scale, ver_scale;
uint32_t hor_scale, ver_scale;
hor_scale = (float)crtc->native_mode->hdisplay/(float)crtc->mode->hdisplay;
ver_scale = (float)crtc->native_mode->vdisplay/(float)crtc->mode->vdisplay;
/* max res is 8192, which is 2^13, which leaves 19 bits */
hor_scale = (crtc->native_mode->hdisplay << 19)/crtc->mode->hdisplay;
ver_scale = (crtc->native_mode->vdisplay << 19)/crtc->mode->vdisplay;
if (ver_scale > hor_scale) {
*outX = crtc->mode->hdisplay * hor_scale;
*outY = crtc->mode->vdisplay * hor_scale;
*outX = (crtc->mode->hdisplay * hor_scale) >> 19;
*outY = (crtc->mode->vdisplay * hor_scale) >> 19;
} else {
*outX = crtc->mode->hdisplay * ver_scale;
*outY = crtc->mode->vdisplay * ver_scale;
*outX = (crtc->mode->hdisplay * ver_scale) >> 19;
*outY = (crtc->mode->vdisplay * ver_scale) >> 19;
}
}