[poppler] about patterns

[Rafael Rodríguez]

So the bbox is for the whole tiled pattern, or just for the pattern cell?

El Miércoles, 23 de Agosto de 2006 17:56, escribió:
> On Sat, Aug 19, 2006 at 10:54:39AM +0100, Rafael Rodríguez wrote:
> > Hi,
> >
> > for those who don't know, i'm the one with the SoK kpdf/okular project:
> >
> > http://developer.kde.org/seasonofkde/project.php?kpdf_pattern.xml
>
> Here is some uncompiled untested code for the cairo backend that has the
> basic idea of rendering to a temporary surface and then tiling that. It
> might be of some help.
>
> -Jeff
>
>
> Index: poppler/CairoOutputDev.cc
> ===================================================================
> RCS file: /cvs/poppler/poppler/poppler/CairoOutputDev.cc,v
> retrieving revision 1.40
> diff -u -r1.40 CairoOutputDev.cc
> --- poppler/CairoOutputDev.cc	28 Jul 2006 18:17:45 -0000	1.40
> +++ poppler/CairoOutputDev.cc	23 Aug 2006 01:15:13 -0000
> @@ -349,6 +349,55 @@
>    cairo_fill (cairo);
>  }
>
> +void CairoOutputDev::tilingPatternFill(GfxState *state, Object *str,
> +				    int paintType, Dict *resDict,
> +				    double *mat, double *bbox,
> +				    int x0, int y0, int x1, int y1,
> +				    double xStep, double yStep) {
> +  PDFRectangle box;
> +  Gfx *gfx;
> +  cairo_surface_t *s;
> +  cairo_surface_t *tile;
> +  cairo_content_t content;
> +  cairo_t *temp;
> +  cairo_t *tile_cr;
> +  cairo_t *surface_cr;
> +
> +  if (paintType == 2)
> +	  content = CAIRO_CONTENT_COLOR_ALPHA;
> +  else
> +	  content = CAIRO_CONTENT_ALPHA;
> +
> +  // should be bounding box
> +  tile = cairo_create_surface_similiar(cairo_get_target(cairo), content,
> x1-x0, y1-y0); +  tile_cr = cairo_create (tile);
> +  temp = cairo;
> +  cairo = tile_cr;
> +  box.x1 = bbox[0];
> +  box.y1 = bbox[1];
> +  box.x2 = bbox[2];
> +  box.y2 = bbox[3];
> +
> +  gfx = new Gfx(xref, this, resDict, &box, NULL);
> +  gfx->display(str);
> +
> +  cairo = temp;
> +  //XXX: need to concat mat[]
> +  for (int i = x0; i<x1; i++) {
> +	  for (int j = y0; j<y1; j++) {
> +		  if (paintType == 2) {
> +			  cairo_set_source_surface(tile,i*xStep,j*yStep);
> +			  cairo_paint(cairo);
> +		  } else {
> +			  cairo_mask_surface(tile, i*xStep, j*yStep);
> +		  }
> +	  }
> +  }
> +  cairo_destroy (tile_cr);
> +  cairo_surface_destroy(tile);
> +}
> +
> +
>  void CairoOutputDev::clip(GfxState *state) {
>    doPath (state, state->getPath());
>    cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_WINDING);

-- 
Rafael Rodríguez

http://unrincon.blogspot.com
http://cornerofcode.blogspot.com