[Git][freetype/freetype-demos][master] [tgrid] Avoid memory guzzling.

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType Demo Programs

Commits:

• 2bbb6d39
  by Alexei Podtelezhnikov (Алексей Подтележников) at 2024-12-18T18:51:35+00:00

  [tgrid] Avoid memory guzzling.
  
  * src/ftgrid.c (grid_status_draw_outline:DO_BITMAP): Pseudo-crop the glyph 
  bitmap enough to cover visible area after scaling and avoid huge memory
  allocations.

1 changed file:

• src/ftgrid.c

Changes:

src/ftgrid.c

---

...	...	@@ -586,13 +586,83 @@
586	586	&x_advance, &y_advance, &glyf);
587	587	if ( !error )
588	588	{
589		- bitmap_scale( st, &bitg, scale );
	589	+ int width = bitg.width;
	590	+ int rows = bitg.rows;
	591	+ int delta, pix = 1, piy = 1;
590	592
591		- grBlitGlyphToSurface( display->surface, &bitg,
592		- ox + left * scale, oy - top * scale,
593		- st->axis_color );
594	593
595		- grDoneBitmap( &bitg );
	594	+ switch ( bitg.mode )
	595	+ {
	596	+ case gr_pixel_mode_lcd:
	597	+ case gr_pixel_mode_lcd2:
	598	+ width /= 3;
	599	+ pix = 3;
	600	+ break;
	601	+ case gr_pixel_mode_lcdv:
	602	+ case gr_pixel_mode_lcdv2:
	603	+ rows /= 3;
	604	+ piy = 3;
	605	+ break;
	606	+ case gr_pixel_mode_bgra:
	607	+ pix = 4;
	608	+ break;
	609	+ default:
	610	+ break;
	611	+ }
	612	+
	613	+ /* extreme zoom needs early crop to avoid memory overallocation */
	614	+ delta = oy - top * scale;
	615	+ if ( delta < 0 )
	616	+ {
	617	+ delta /= scale;
	618	+ rows += delta;
	619	+ top += delta;
	620	+ if ( bitg.pitch > 0 )
	621	+ bitg.buffer -= delta * bitg.pitch * piy;
	622	+ }
	623	+
	624	+ delta = oy + ( rows - top ) * scale - display->bitmap->rows;
	625	+ if ( delta > 0 )
	626	+ {
	627	+ delta /= scale;
	628	+ rows -= delta;
	629	+ if ( bitg.pitch < 0 )
	630	+ bitg.buffer += delta * bitg.pitch * piy;
	631	+ }
	632	+
	633	+ bitg.rows = rows * piy;
	634	+
	635	+ delta = ox + left * scale;
	636	+ if ( delta < 0 )
	637	+ {
	638	+ delta /= scale;
	639	+ width += delta;
	640	+ left -= delta;
	641	+ bitg.buffer -= delta * pix;
	642	+ }
	643	+
	644	+ delta = ox + ( left + width ) * scale - display->bitmap->width;
	645	+ if ( delta > 0 )
	646	+ {
	647	+ delta /= scale;
	648	+ width -= delta;
	649	+ }
	650	+
	651	+ if ( bitg.mode == gr_pixel_mode_bgra )
	652	+ pix = 1;
	653	+
	654	+ bitg.width = width * pix;
	655	+
	656	+ if ( width > 0 && rows > 0 )
	657	+ {
	658	+ bitmap_scale( st, &bitg, scale );
	659	+
	660	+ grBlitGlyphToSurface( display->surface, &bitg,
	661	+ ox + left * scale, oy - top * scale,
	662	+ st->axis_color );
	663	+
	664	+ grDoneBitmap( &bitg );
	665	+ }
596	666
597	667	if ( glyf )
598	668	FT_Done_Glyph( glyf );

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