shithub: freetype+ttf2subf

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[raster] Adjust sub-band bisecting limits.

We can bisect a band until it is just a single scan line.  This might
be slow and cause time-outs but if we need to impose limits it should
be elsewhere.

* src/raster/ftraster.c (Render_Single_Pass): Tweak sub-banding.

git/fs: mount .git/fs: mount/attach disallowed

--- a/ChangeLog

+++ b/ChangeLog

@@ -1,5 +1,15 @@

 2021-06-25  Alexei Podtelezhnikov  <[email protected]>

+	[raster] Adjust sub-band bisecting limits.

+

+	We can bisect a band until it is just a single scan line.  This might

+	be slow and cause time-outs but if we need to impose limits it should

+	be elsewhere.

+

+	* src/raster/ftraster.c (Render_Single_Pass): Tweak sub-banding.

+

+2021-06-25  Alexei Podtelezhnikov  <[email protected]>

+

 	* src/raster/ftraster.c (Render_Single_Pass): Remove dead code.

 2021-06-25  Werner Lemberg  <[email protected]>

--- a/src/raster/ftraster.c

+++ b/src/raster/ftraster.c

@@ -528,6 +528,7 @@

     TPoint      arcs[3 * MaxBezier + 1]; /* The Bezier stack               */

     black_TBand  band_stack[16];    /* band stack used for sub-banding     */

+                                    /* enough for signed short bands       */

     Int          band_top;          /* band stack top                      */

   };

@@ -3054,9 +3055,7 @@

         i = ras.band_stack[ras.band_top].y_min;

         j = ras.band_stack[ras.band_top].y_max;

-        k = (Short)( ( i + j ) / 2 );

-

-        if ( ras.band_top >= 7 || k < i )

+        if ( i == j )

         {

           ras.band_top = 0;

@@ -3063,10 +3062,12 @@

           return ras.error;  /* still Raster_Overflow */

         }

-        ras.band_stack[ras.band_top + 1].y_min = k;

+        k = (Short)( ( i + j ) / 2 );

+

+        ras.band_stack[ras.band_top + 1].y_min = (Short)( k + 1 );

         ras.band_stack[ras.band_top + 1].y_max = j;

-        ras.band_stack[ras.band_top].y_max = (Short)( k - 1 );

+        ras.band_stack[ras.band_top].y_max = k;

         ras.band_top++;

       }