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picture.c
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picture.c
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/*
*
* Copyright © 2000 SuSE, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of SuSE not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. SuSE makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Keith Packard, SuSE, Inc.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include "misc.h"
#include "scrnintstr.h"
#include "os.h"
#include "regionstr.h"
#include "validate.h"
#include "windowstr.h"
#include "input.h"
#include "resource.h"
#include "colormapst.h"
#include "cursorstr.h"
#include "dixstruct.h"
#include "gcstruct.h"
#include "servermd.h"
#include "picturestr.h"
#include "xace.h"
DevPrivateKeyRec PictureScreenPrivateKeyRec;
DevPrivateKeyRec PictureWindowPrivateKeyRec;
static int PictureGeneration;
RESTYPE PictureType;
RESTYPE PictFormatType;
RESTYPE GlyphSetType;
int PictureCmapPolicy = PictureCmapPolicyDefault;
Bool
PictureDestroyWindow (WindowPtr pWindow)
{
ScreenPtr pScreen = pWindow->drawable.pScreen;
PicturePtr pPicture;
PictureScreenPtr ps = GetPictureScreen(pScreen);
Bool ret;
while ((pPicture = GetPictureWindow(pWindow)))
{
SetPictureWindow(pWindow, pPicture->pNext);
if (pPicture->id)
FreeResource (pPicture->id, PictureType);
FreePicture ((pointer) pPicture, pPicture->id);
}
pScreen->DestroyWindow = ps->DestroyWindow;
ret = (*pScreen->DestroyWindow) (pWindow);
ps->DestroyWindow = pScreen->DestroyWindow;
pScreen->DestroyWindow = PictureDestroyWindow;
return ret;
}
Bool
PictureCloseScreen (int index, ScreenPtr pScreen)
{
PictureScreenPtr ps = GetPictureScreen(pScreen);
Bool ret;
int n;
pScreen->CloseScreen = ps->CloseScreen;
ret = (*pScreen->CloseScreen) (index, pScreen);
PictureResetFilters (pScreen);
for (n = 0; n < ps->nformats; n++)
if (ps->formats[n].type == PictTypeIndexed)
(*ps->CloseIndexed) (pScreen, &ps->formats[n]);
GlyphUninit (pScreen);
SetPictureScreen(pScreen, 0);
free(ps->formats);
free(ps);
return ret;
}
void
PictureStoreColors (ColormapPtr pColormap, int ndef, xColorItem *pdef)
{
ScreenPtr pScreen = pColormap->pScreen;
PictureScreenPtr ps = GetPictureScreen(pScreen);
pScreen->StoreColors = ps->StoreColors;
(*pScreen->StoreColors) (pColormap, ndef, pdef);
ps->StoreColors = pScreen->StoreColors;
pScreen->StoreColors = PictureStoreColors;
if (pColormap->class == PseudoColor || pColormap->class == GrayScale)
{
PictFormatPtr format = ps->formats;
int nformats = ps->nformats;
while (nformats--)
{
if (format->type == PictTypeIndexed &&
format->index.pColormap == pColormap)
{
(*ps->UpdateIndexed) (pScreen, format, ndef, pdef);
break;
}
format++;
}
}
}
static int
visualDepth (ScreenPtr pScreen, VisualPtr pVisual)
{
int d, v;
DepthPtr pDepth;
for (d = 0; d < pScreen->numDepths; d++)
{
pDepth = &pScreen->allowedDepths[d];
for (v = 0; v < pDepth->numVids; v++)
if (pDepth->vids[v] == pVisual->vid)
return pDepth->depth;
}
return 0;
}
typedef struct _formatInit {
CARD32 format;
CARD8 depth;
} FormatInitRec, *FormatInitPtr;
static int
addFormat (FormatInitRec formats[256],
int nformat,
CARD32 format,
CARD8 depth)
{
int n;
for (n = 0; n < nformat; n++)
if (formats[n].format == format && formats[n].depth == depth)
return nformat;
formats[nformat].format = format;
formats[nformat].depth = depth;
return ++nformat;
}
#define Mask(n) ((n) == 32 ? 0xffffffff : ((1 << (n))-1))
PictFormatPtr
PictureCreateDefaultFormats (ScreenPtr pScreen, int *nformatp)
{
int nformats, f;
PictFormatPtr pFormats;
FormatInitRec formats[1024];
CARD32 format;
CARD8 depth;
VisualPtr pVisual;
int v;
int bpp;
int type;
int r, g, b;
int d;
DepthPtr pDepth;
nformats = 0;
/* formats required by protocol */
formats[nformats].format = PICT_a1;
formats[nformats].depth = 1;
nformats++;
formats[nformats].format = PICT_FORMAT(BitsPerPixel(8),
PICT_TYPE_A,
8, 0, 0, 0);
formats[nformats].depth = 8;
nformats++;
formats[nformats].format = PICT_FORMAT(BitsPerPixel(4),
PICT_TYPE_A,
4, 0, 0, 0);
formats[nformats].depth = 4;
nformats++;
formats[nformats].format = PICT_a8r8g8b8;
formats[nformats].depth = 32;
nformats++;
formats[nformats].format = PICT_x8r8g8b8;
formats[nformats].depth = 32;
nformats++;
formats[nformats].format = PICT_b8g8r8a8;
formats[nformats].depth = 32;
nformats++;
formats[nformats].format = PICT_b8g8r8x8;
formats[nformats].depth = 32;
nformats++;
/* now look through the depths and visuals adding other formats */
for (v = 0; v < pScreen->numVisuals; v++)
{
pVisual = &pScreen->visuals[v];
depth = visualDepth (pScreen, pVisual);
if (!depth)
continue;
bpp = BitsPerPixel (depth);
switch (pVisual->class) {
case DirectColor:
case TrueColor:
r = Ones (pVisual->redMask);
g = Ones (pVisual->greenMask);
b = Ones (pVisual->blueMask);
type = PICT_TYPE_OTHER;
/*
* Current rendering code supports only three direct formats,
* fields must be packed together at the bottom of the pixel
*/
if (pVisual->offsetBlue == 0 &&
pVisual->offsetGreen == b &&
pVisual->offsetRed == b + g)
{
type = PICT_TYPE_ARGB;
}
else if (pVisual->offsetRed == 0 &&
pVisual->offsetGreen == r &&
pVisual->offsetBlue == r + g)
{
type = PICT_TYPE_ABGR;
}
else if (pVisual->offsetRed == pVisual->offsetGreen - r &&
pVisual->offsetGreen == pVisual->offsetBlue - g &&
pVisual->offsetBlue == bpp - b)
{
type = PICT_TYPE_BGRA;
}
if (type != PICT_TYPE_OTHER)
{
format = PICT_FORMAT(bpp, type, 0, r, g, b);
nformats = addFormat (formats, nformats, format, depth);
}
break;
case StaticColor:
case PseudoColor:
format = PICT_VISFORMAT (bpp, PICT_TYPE_COLOR, v);
nformats = addFormat (formats, nformats, format, depth);
break;
case StaticGray:
case GrayScale:
format = PICT_VISFORMAT (bpp, PICT_TYPE_GRAY, v);
nformats = addFormat (formats, nformats, format, depth);
break;
}
}
/*
* Walk supported depths and add useful Direct formats
*/
for (d = 0; d < pScreen->numDepths; d++)
{
pDepth = &pScreen->allowedDepths[d];
bpp = BitsPerPixel (pDepth->depth);
format = 0;
switch (bpp) {
case 16:
/* depth 12 formats */
if (pDepth->depth >= 12)
{
nformats = addFormat (formats, nformats,
PICT_x4r4g4b4, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_x4b4g4r4, pDepth->depth);
}
/* depth 15 formats */
if (pDepth->depth >= 15)
{
nformats = addFormat (formats, nformats,
PICT_x1r5g5b5, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_x1b5g5r5, pDepth->depth);
}
/* depth 16 formats */
if (pDepth->depth >= 16)
{
nformats = addFormat (formats, nformats,
PICT_a1r5g5b5, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_a1b5g5r5, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_r5g6b5, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_b5g6r5, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_a4r4g4b4, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_a4b4g4r4, pDepth->depth);
}
break;
case 24:
if (pDepth->depth >= 24)
{
nformats = addFormat (formats, nformats,
PICT_r8g8b8, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_b8g8r8, pDepth->depth);
}
break;
case 32:
if (pDepth->depth >= 24)
{
nformats = addFormat (formats, nformats,
PICT_x8r8g8b8, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_x8b8g8r8, pDepth->depth);
}
if (pDepth->depth >= 30)
{
nformats = addFormat (formats, nformats,
PICT_a2r10g10b10, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_x2r10g10b10, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_a2b10g10r10, pDepth->depth);
nformats = addFormat (formats, nformats,
PICT_x2b10g10r10, pDepth->depth);
}
break;
}
}
pFormats = calloc(nformats, sizeof (PictFormatRec));
if (!pFormats)
return 0;
for (f = 0; f < nformats; f++)
{
pFormats[f].id = FakeClientID (0);
pFormats[f].depth = formats[f].depth;
format = formats[f].format;
pFormats[f].format = format;
switch (PICT_FORMAT_TYPE(format)) {
case PICT_TYPE_ARGB:
pFormats[f].type = PictTypeDirect;
pFormats[f].direct.alphaMask = Mask(PICT_FORMAT_A(format));
if (pFormats[f].direct.alphaMask)
pFormats[f].direct.alpha = (PICT_FORMAT_R(format) +
PICT_FORMAT_G(format) +
PICT_FORMAT_B(format));
pFormats[f].direct.redMask = Mask(PICT_FORMAT_R(format));
pFormats[f].direct.red = (PICT_FORMAT_G(format) +
PICT_FORMAT_B(format));
pFormats[f].direct.greenMask = Mask(PICT_FORMAT_G(format));
pFormats[f].direct.green = PICT_FORMAT_B(format);
pFormats[f].direct.blueMask = Mask(PICT_FORMAT_B(format));
pFormats[f].direct.blue = 0;
break;
case PICT_TYPE_ABGR:
pFormats[f].type = PictTypeDirect;
pFormats[f].direct.alphaMask = Mask(PICT_FORMAT_A(format));
if (pFormats[f].direct.alphaMask)
pFormats[f].direct.alpha = (PICT_FORMAT_B(format) +
PICT_FORMAT_G(format) +
PICT_FORMAT_R(format));
pFormats[f].direct.blueMask = Mask(PICT_FORMAT_B(format));
pFormats[f].direct.blue = (PICT_FORMAT_G(format) +
PICT_FORMAT_R(format));
pFormats[f].direct.greenMask = Mask(PICT_FORMAT_G(format));
pFormats[f].direct.green = PICT_FORMAT_R(format);
pFormats[f].direct.redMask = Mask(PICT_FORMAT_R(format));
pFormats[f].direct.red = 0;
break;
case PICT_TYPE_BGRA:
pFormats[f].type = PictTypeDirect;
pFormats[f].direct.blueMask = Mask(PICT_FORMAT_B(format));
pFormats[f].direct.blue = (PICT_FORMAT_BPP(format) - PICT_FORMAT_B(format));
pFormats[f].direct.greenMask = Mask(PICT_FORMAT_G(format));
pFormats[f].direct.green = (PICT_FORMAT_BPP(format) - PICT_FORMAT_B(format) -
PICT_FORMAT_G(format));
pFormats[f].direct.redMask = Mask(PICT_FORMAT_R(format));
pFormats[f].direct.red = (PICT_FORMAT_BPP(format) - PICT_FORMAT_B(format) -
PICT_FORMAT_G(format) - PICT_FORMAT_R(format));
pFormats[f].direct.alphaMask = Mask(PICT_FORMAT_A(format));
pFormats[f].direct.alpha = 0;
break;
case PICT_TYPE_A:
pFormats[f].type = PictTypeDirect;
pFormats[f].direct.alpha = 0;
pFormats[f].direct.alphaMask = Mask(PICT_FORMAT_A(format));
/* remaining fields already set to zero */
break;
case PICT_TYPE_COLOR:
case PICT_TYPE_GRAY:
pFormats[f].type = PictTypeIndexed;
pFormats[f].index.vid = pScreen->visuals[PICT_FORMAT_VIS(format)].vid;
break;
}
}
*nformatp = nformats;
return pFormats;
}
static VisualPtr
PictureFindVisual (ScreenPtr pScreen, VisualID visual)
{
int i;
VisualPtr pVisual;
for (i = 0, pVisual = pScreen->visuals;
i < pScreen->numVisuals;
i++, pVisual++)
{
if (pVisual->vid == visual)
return pVisual;
}
return 0;
}
Bool
PictureInitIndexedFormat(ScreenPtr pScreen, PictFormatPtr format)
{
PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
if (format->type != PictTypeIndexed || format->index.pColormap)
return TRUE;
if (format->index.vid == pScreen->rootVisual) {
dixLookupResourceByType((pointer *)&format->index.pColormap,
pScreen->defColormap, RT_COLORMAP,
serverClient, DixGetAttrAccess);
} else {
VisualPtr pVisual = PictureFindVisual(pScreen, format->index.vid);
if (CreateColormap(FakeClientID (0), pScreen, pVisual,
&format->index.pColormap, AllocNone, 0)
!= Success)
return FALSE;
}
if (!ps->InitIndexed(pScreen, format))
return FALSE;
return TRUE;
}
static Bool
PictureInitIndexedFormats (ScreenPtr pScreen)
{
PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
PictFormatPtr format;
int nformat;
if (!ps)
return FALSE;
format = ps->formats;
nformat = ps->nformats;
while (nformat--)
if (!PictureInitIndexedFormat(pScreen, format++))
return FALSE;
return TRUE;
}
Bool
PictureFinishInit (void)
{
int s;
for (s = 0; s < screenInfo.numScreens; s++)
{
if (!PictureInitIndexedFormats (screenInfo.screens[s]))
return FALSE;
(void) AnimCurInit (screenInfo.screens[s]);
}
return TRUE;
}
Bool
PictureSetSubpixelOrder (ScreenPtr pScreen, int subpixel)
{
PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
if (!ps)
return FALSE;
ps->subpixel = subpixel;
return TRUE;
}
int
PictureGetSubpixelOrder (ScreenPtr pScreen)
{
PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
if (!ps)
return SubPixelUnknown;
return ps->subpixel;
}
PictFormatPtr
PictureMatchVisual (ScreenPtr pScreen, int depth, VisualPtr pVisual)
{
PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
PictFormatPtr format;
int nformat;
int type;
if (!ps)
return 0;
format = ps->formats;
nformat = ps->nformats;
switch (pVisual->class) {
case StaticGray:
case GrayScale:
case StaticColor:
case PseudoColor:
type = PictTypeIndexed;
break;
case TrueColor:
case DirectColor:
type = PictTypeDirect;
break;
default:
return 0;
}
while (nformat--)
{
if (format->depth == depth && format->type == type)
{
if (type == PictTypeIndexed)
{
if (format->index.vid == pVisual->vid)
return format;
}
else
{
if (format->direct.redMask << format->direct.red ==
pVisual->redMask &&
format->direct.greenMask << format->direct.green ==
pVisual->greenMask &&
format->direct.blueMask << format->direct.blue ==
pVisual->blueMask)
{
return format;
}
}
}
format++;
}
return 0;
}
PictFormatPtr
PictureMatchFormat (ScreenPtr pScreen, int depth, CARD32 f)
{
PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
PictFormatPtr format;
int nformat;
if (!ps)
return 0;
format = ps->formats;
nformat = ps->nformats;
while (nformat--)
{
if (format->depth == depth && format->format == (f & 0xffffff))
return format;
format++;
}
return 0;
}
int
PictureParseCmapPolicy (const char *name)
{
if ( strcmp (name, "default" ) == 0)
return PictureCmapPolicyDefault;
else if ( strcmp (name, "mono" ) == 0)
return PictureCmapPolicyMono;
else if ( strcmp (name, "gray" ) == 0)
return PictureCmapPolicyGray;
else if ( strcmp (name, "color" ) == 0)
return PictureCmapPolicyColor;
else if ( strcmp (name, "all" ) == 0)
return PictureCmapPolicyAll;
else
return PictureCmapPolicyInvalid;
}
Bool
PictureInit (ScreenPtr pScreen, PictFormatPtr formats, int nformats)
{
PictureScreenPtr ps;
int n;
CARD32 type, a, r, g, b;
if (PictureGeneration != serverGeneration)
{
PictureType = CreateNewResourceType (FreePicture, "PICTURE");
if (!PictureType)
return FALSE;
PictFormatType = CreateNewResourceType (FreePictFormat, "PICTFORMAT");
if (!PictFormatType)
return FALSE;
GlyphSetType = CreateNewResourceType (FreeGlyphSet, "GLYPHSET");
if (!GlyphSetType)
return FALSE;
PictureGeneration = serverGeneration;
}
if (!dixRegisterPrivateKey(&PictureScreenPrivateKeyRec, PRIVATE_SCREEN, 0))
return FALSE;
if (!dixRegisterPrivateKey(&PictureWindowPrivateKeyRec, PRIVATE_WINDOW, 0))
return FALSE;
if (!formats)
{
formats = PictureCreateDefaultFormats (pScreen, &nformats);
if (!formats)
return FALSE;
}
for (n = 0; n < nformats; n++)
{
if (!AddResource (formats[n].id, PictFormatType, (pointer) (formats+n)))
{
free(formats);
return FALSE;
}
if (formats[n].type == PictTypeIndexed)
{
VisualPtr pVisual = PictureFindVisual (pScreen, formats[n].index.vid);
if ((pVisual->class | DynamicClass) == PseudoColor)
type = PICT_TYPE_COLOR;
else
type = PICT_TYPE_GRAY;
a = r = g = b = 0;
}
else
{
if ((formats[n].direct.redMask|
formats[n].direct.blueMask|
formats[n].direct.greenMask) == 0)
type = PICT_TYPE_A;
else if (formats[n].direct.red > formats[n].direct.blue)
type = PICT_TYPE_ARGB;
else if (formats[n].direct.red == 0)
type = PICT_TYPE_ABGR;
else
type = PICT_TYPE_BGRA;
a = Ones (formats[n].direct.alphaMask);
r = Ones (formats[n].direct.redMask);
g = Ones (formats[n].direct.greenMask);
b = Ones (formats[n].direct.blueMask);
}
formats[n].format = PICT_FORMAT(0,type,a,r,g,b);
}
ps = (PictureScreenPtr) malloc(sizeof (PictureScreenRec));
if (!ps)
{
free(formats);
return FALSE;
}
SetPictureScreen(pScreen, ps);
ps->formats = formats;
ps->fallback = formats;
ps->nformats = nformats;
ps->filters = 0;
ps->nfilters = 0;
ps->filterAliases = 0;
ps->nfilterAliases = 0;
ps->subpixel = SubPixelUnknown;
ps->CloseScreen = pScreen->CloseScreen;
ps->DestroyWindow = pScreen->DestroyWindow;
ps->StoreColors = pScreen->StoreColors;
pScreen->DestroyWindow = PictureDestroyWindow;
pScreen->CloseScreen = PictureCloseScreen;
pScreen->StoreColors = PictureStoreColors;
if (!PictureSetDefaultFilters (pScreen))
{
PictureResetFilters (pScreen);
SetPictureScreen(pScreen, 0);
free(formats);
free(ps);
return FALSE;
}
return TRUE;
}
void
SetPictureToDefaults (PicturePtr pPicture)
{
pPicture->refcnt = 1;
pPicture->repeat = 0;
pPicture->graphicsExposures = FALSE;
pPicture->subWindowMode = ClipByChildren;
pPicture->polyEdge = PolyEdgeSharp;
pPicture->polyMode = PolyModePrecise;
pPicture->freeCompClip = FALSE;
pPicture->clientClipType = CT_NONE;
pPicture->componentAlpha = FALSE;
pPicture->repeatType = RepeatNone;
pPicture->alphaMap = 0;
pPicture->alphaOrigin.x = 0;
pPicture->alphaOrigin.y = 0;
pPicture->clipOrigin.x = 0;
pPicture->clipOrigin.y = 0;
pPicture->clientClip = 0;
pPicture->transform = 0;
pPicture->dither = None;
pPicture->filter = PictureGetFilterId (FilterNearest, -1, TRUE);
pPicture->filter_params = 0;
pPicture->filter_nparams = 0;
pPicture->serialNumber = GC_CHANGE_SERIAL_BIT;
pPicture->stateChanges = (1 << (CPLastBit+1)) - 1;
pPicture->pSourcePict = 0;
}
PicturePtr
CreatePicture (Picture pid,
DrawablePtr pDrawable,
PictFormatPtr pFormat,
Mask vmask,
XID *vlist,
ClientPtr client,
int *error)
{
PicturePtr pPicture;
PictureScreenPtr ps = GetPictureScreen(pDrawable->pScreen);
pPicture = dixAllocateObjectWithPrivates(PictureRec, PRIVATE_PICTURE);
if (!pPicture)
{
*error = BadAlloc;
return 0;
}
pPicture->id = pid;
pPicture->pDrawable = pDrawable;
pPicture->pFormat = pFormat;
pPicture->format = pFormat->format | (pDrawable->bitsPerPixel << 24);
/* security creation/labeling check */
*error = XaceHook(XACE_RESOURCE_ACCESS, client, pid, PictureType, pPicture,
RT_PIXMAP, pDrawable, DixCreateAccess|DixSetAttrAccess);
if (*error != Success)
goto out;
if (pDrawable->type == DRAWABLE_PIXMAP)
{
++((PixmapPtr)pDrawable)->refcnt;
pPicture->pNext = 0;
}
else
{
pPicture->pNext = GetPictureWindow(((WindowPtr) pDrawable));
SetPictureWindow(((WindowPtr) pDrawable), pPicture);
}
SetPictureToDefaults (pPicture);
if (vmask)
*error = ChangePicture (pPicture, vmask, vlist, 0, client);
else
*error = Success;
if (*error == Success)
*error = (*ps->CreatePicture) (pPicture);
out:
if (*error != Success)
{
FreePicture (pPicture, (XID) 0);
pPicture = 0;
}
return pPicture;
}
static CARD32 xRenderColorToCard32(xRenderColor c)
{
return
(c.alpha >> 8 << 24) |
(c.red >> 8 << 16) |
(c.green & 0xff00) |
(c.blue >> 8);
}
static unsigned int premultiply(unsigned int x)
{
unsigned int a = x >> 24;
unsigned int t = (x & 0xff00ff) * a + 0x800080;
t = (t + ((t >> 8) & 0xff00ff)) >> 8;
t &= 0xff00ff;
x = ((x >> 8) & 0xff) * a + 0x80;
x = (x + ((x >> 8) & 0xff));
x &= 0xff00;
x |= t | (a << 24);
return x;
}
static unsigned int INTERPOLATE_PIXEL_256(unsigned int x, unsigned int a,
unsigned int y, unsigned int b)
{
CARD32 t = (x & 0xff00ff) * a + (y & 0xff00ff) * b;
t >>= 8;
t &= 0xff00ff;
x = ((x >> 8) & 0xff00ff) * a + ((y >> 8) & 0xff00ff) * b;
x &= 0xff00ff00;
x |= t;
return x;
}
CARD32
PictureGradientColor (PictGradientStopPtr stop1,
PictGradientStopPtr stop2,
CARD32 x)
{
CARD32 current_color, next_color;
int dist, idist;
current_color = xRenderColorToCard32 (stop1->color);
next_color = xRenderColorToCard32 (stop2->color);
dist = (int) (256 * (x - stop1->x) / (stop2->x - stop1->x));
idist = 256 - dist;
return premultiply (INTERPOLATE_PIXEL_256 (current_color, idist,
next_color, dist));
}
static void initGradient(SourcePictPtr pGradient, int stopCount,
xFixed *stopPoints, xRenderColor *stopColors, int *error)
{
int i;
xFixed dpos;
if (stopCount <= 0) {
*error = BadValue;
return;
}
dpos = -1;
for (i = 0; i < stopCount; ++i) {
if (stopPoints[i] < dpos || stopPoints[i] > (1<<16)) {
*error = BadValue;
return;
}
dpos = stopPoints[i];
}
pGradient->gradient.stops = malloc(stopCount*sizeof(PictGradientStop));
if (!pGradient->gradient.stops) {
*error = BadAlloc;
return;
}
pGradient->gradient.nstops = stopCount;
for (i = 0; i < stopCount; ++i) {
pGradient->gradient.stops[i].x = stopPoints[i];
pGradient->gradient.stops[i].color = stopColors[i];
}
pGradient->gradient.class = SourcePictClassUnknown;
pGradient->gradient.stopRange = 0xffff;
pGradient->gradient.colorTable = NULL;
pGradient->gradient.colorTableSize = 0;
}
static PicturePtr createSourcePicture(void)
{
PicturePtr pPicture;
pPicture = dixAllocateObjectWithPrivates(PictureRec, PRIVATE_PICTURE);
pPicture->pDrawable = 0;
pPicture->pFormat = 0;
pPicture->pNext = 0;
pPicture->format = PICT_a8r8g8b8;
SetPictureToDefaults(pPicture);
return pPicture;
}
PicturePtr
CreateSolidPicture (Picture pid, xRenderColor *color, int *error)
{
PicturePtr pPicture;
pPicture = createSourcePicture();
if (!pPicture) {
*error = BadAlloc;
return 0;
}
pPicture->id = pid;
pPicture->pSourcePict = (SourcePictPtr) malloc(sizeof(PictSolidFill));
if (!pPicture->pSourcePict) {
*error = BadAlloc;
free(pPicture);
return 0;
}
pPicture->pSourcePict->type = SourcePictTypeSolidFill;
pPicture->pSourcePict->solidFill.color = xRenderColorToCard32(*color);
return pPicture;
}
PicturePtr
CreateLinearGradientPicture (Picture pid, xPointFixed *p1, xPointFixed *p2,
int nStops, xFixed *stops, xRenderColor *colors, int *error)
{
PicturePtr pPicture;
if (nStops < 2) {
*error = BadValue;
return 0;
}
pPicture = createSourcePicture();
if (!pPicture) {
*error = BadAlloc;
return 0;
}
pPicture->id = pid;
pPicture->pSourcePict = (SourcePictPtr) malloc(sizeof(PictLinearGradient));
if (!pPicture->pSourcePict) {
*error = BadAlloc;
free(pPicture);
return 0;
}
pPicture->pSourcePict->linear.type = SourcePictTypeLinear;
pPicture->pSourcePict->linear.p1 = *p1;
pPicture->pSourcePict->linear.p2 = *p2;
initGradient(pPicture->pSourcePict, nStops, stops, colors, error);
if (*error) {
free(pPicture);
return 0;
}
return pPicture;
}
#define FixedToDouble(x) ((x)/65536.)
PicturePtr
CreateRadialGradientPicture (Picture pid, xPointFixed *inner, xPointFixed *outer,
xFixed innerRadius, xFixed outerRadius,
int nStops, xFixed *stops, xRenderColor *colors, int *error)
{
PicturePtr pPicture;
PictRadialGradient *radial;
if (nStops < 2) {
*error = BadValue;
return 0;
}
pPicture = createSourcePicture();
if (!pPicture) {
*error = BadAlloc;
return 0;
}
pPicture->id = pid;
pPicture->pSourcePict = (SourcePictPtr) malloc(sizeof(PictRadialGradient));
if (!pPicture->pSourcePict) {
*error = BadAlloc;
free(pPicture);
return 0;
}
radial = &pPicture->pSourcePict->radial;