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#include "surface.h"
#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
XRenderSurf *
xrender_surf_new(Display *disp, Drawable draw, int format, int w, int h, Bool ca)
{
XRenderSurf *rs;
XRenderPictFormat *fmt;
XRenderPictureAttributes att = {
.component_alpha = ca,
};
Visual *vis = DefaultVisual(disp, DefaultScreen(disp));
rs = (XRenderSurf*)calloc(1, sizeof(XRenderSurf));
fmt = XRenderFindStandardFormat(disp, format);
rs->w = w;
rs->h = h;
rs->depth = fmt->depth;
rs->vis = vis;
rs->draw = XCreatePixmap(disp, draw, w, h, fmt->depth);
rs->pic = XRenderCreatePicture(disp, rs->draw, fmt,
CPComponentAlpha, &att);
rs->allocated = 1;
return rs;
}
XRenderSurf *
xrender_surf_adopt(Display *disp, Drawable draw, int w, int h)
{
XWindowAttributes win_attr;
XRenderSurf *rs;
XRenderPictFormat *fmt;
XRenderPictureAttributes att;
XGetWindowAttributes(disp, draw, &win_attr);
Visual *vis = win_attr.visual;
rs = (XRenderSurf*)calloc(1, sizeof(XRenderSurf));
fmt = XRenderFindVisualFormat(disp, vis);
rs->w = w;
rs->h = h;
rs->depth = fmt->depth;
rs->vis = vis;
rs->draw = draw;
rs->pic = XRenderCreatePicture(disp, rs->draw, fmt, 0, &att);
rs->allocated = 0;
return rs;
}
void
xrender_surf_free(Display *disp, XRenderSurf *rs)
{
if (rs->allocated) XFreePixmap(disp, rs->draw);
XRenderFreePicture(disp, rs->pic);
free(rs);
}
void
xrender_surf_populate(Display *disp, XRenderSurf *rs, int w, int h,
char *img_data)
{
GC gc;
XGCValues gcv;
XImage *xim;
int x, y;
gc = XCreateGC(disp, rs->draw, 0, &gcv);
xim = XCreateImage(disp, rs->vis, rs->depth, ZPixmap, 0, NULL, w, h, 32, w * 4);
xim->data = img_data;
XPutImage(disp, rs->draw, gc, xim, 0, 0, 0, 0, w, h);
free(xim->data);
xim->data = NULL;
XDestroyImage(xim);
XFreeGC(disp, gc);
}
/* this is similar to create_gaussian_kernel_1d() except for the fact that I use
** a naive (or let's call it: brute-force) 2d implementation of a gaussian-blur
** to be able to compare the performance... and the performance non-surprisingly
** sucks... 2 pass 1d gauss. blur is faster than 1 pass 2d gauss. blur */
static XFixed*
create_gaussian_kernel_2d (int iRadius,
int* piSize)
{
double fSigma = (double) iRadius / 2.0f;
double fScale1;
double fScale2;
double* pTmpKernel = NULL;
XFixed* pKernel = NULL;
double fU;
double fV;
int iX;
int iY;
double fSum = 0.0f;
assert (piSize != NULL);
fScale2 = 2.0f * fSigma * fSigma;
fScale1 = 1.0f / (M_PI * fScale2);
*piSize = (2 * iRadius+1) * (2 * iRadius+1);
pTmpKernel = (double*) calloc (*piSize, sizeof (double));
if (!pTmpKernel)
return NULL;
for (iX = 0; iX < 2 * iRadius+1; iX++)
{
for (iY = 0; iY < 2 * iRadius+1; iY++)
{
fU = (double) iX;
fV = (double) iY;
pTmpKernel[iX+iY*(2*iRadius+1)] = fScale1 * exp (-(fU*fU+fV*fV) / fScale2);
}
}
for (iX = 0; iX < *piSize; iX++)
fSum += pTmpKernel[iX];
for (iX = 0; iX < *piSize; iX++)
pTmpKernel[iX] /= fSum;
pKernel = (XFixed*) calloc (*piSize + 2, sizeof (XFixed));
if (!pKernel)
{
free (pTmpKernel);
return NULL;
}
for (iX = 0; iX < *piSize; iX++)
pKernel[iX + 2] = XDoubleToFixed (pTmpKernel[iX]);
free (pTmpKernel);
*piSize += 2;
pKernel[0] = (2 * iRadius + 1) <<16;
pKernel[1] = (2 * iRadius + 1) << 16;
return pKernel;
}
static void
set_convolution(Display *disp, XRenderSurf *rs)
{
int kernel_size;
XFixed *blur_kernel = create_gaussian_kernel_2d(20, &kernel_size);
XRenderSetPictureFilter(disp, rs->pic, FilterConvolution, blur_kernel,
kernel_size);
}
void
xrender_surf_prepare(Display *disp, XRenderSurf *src, int w, int h,
int transformations, SurfaceFilter filter)
{
if (transformations) {
XTransform xf;
xf.matrix[0][0] = (65536 * src->w) / (w*2); xf.matrix[0][1] = 0; xf.matrix[0][2] = 0;
xf.matrix[1][0] = 0; xf.matrix[1][1] = (65536 * src->h) / h; xf.matrix[1][2] = 0;
xf.matrix[2][0] = 0; xf.matrix[2][1] = 0; xf.matrix[2][2] = 65536;
XRenderSetPictureTransform(disp, src->pic, &xf);
}
switch(filter) {
case SurfaceBilinear:
XRenderSetPictureFilter(disp, src->pic, "bilinear", NULL, 0);
break;
case SurfaceNearest:
XRenderSetPictureFilter(disp, src->pic, "nearest", NULL, 0);
break;
case SurfaceConvolution:
set_convolution(disp, src);
break;
default:
break;
}
}
void xrender_surf_blend(Display *disp, int op, XRenderSurf *src, XRenderSurf *mask, XRenderSurf *dst,
int src_x, int src_y,
int mask_x, int mask_y,
int dst_x, int dst_y,
unsigned int width, unsigned int height)
{
XRenderComposite(disp, op, src->pic, mask ? mask->pic : None, dst->pic, src_x, src_y,
mask_x, mask_y, dst_x, dst_y, width, height);
}
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