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[Plplot-cvs] SF.net SVN: plplot:[12279] trunk/drivers/cairo.c
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From: <and...@us...> - 2012-11-23 09:58:44
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Revision: 12279
http://plplot.svn.sourceforge.net/plplot/?rev=12279&view=rev
Author: andrewross
Date: 2012-11-23 09:58:38 +0000 (Fri, 23 Nov 2012)
Log Message:
-----------
Fix a memory leak in the cairo driver's handling of text.
Modified Paths:
--------------
trunk/drivers/cairo.c
Modified: trunk/drivers/cairo.c
===================================================================
--- trunk/drivers/cairo.c 2012-11-19 22:07:42 UTC (rev 12278)
+++ trunk/drivers/cairo.c 2012-11-23 09:58:38 UTC (rev 12279)
@@ -774,66 +774,67 @@
if ( pls->get_string_length )
{
pls->string_length = (PLFLT) textXExtent * 25.4 / DPI;
- return;
}
+ else
+ {
+ // Set font aliasing
+ context = pango_layout_get_context( layout );
+ cairoFontOptions = cairo_font_options_create();
+ cairo_font_options_set_antialias( cairoFontOptions, aStream->text_anti_aliasing );
+ pango_cairo_context_set_font_options( context, cairoFontOptions );
+ pango_layout_context_changed( layout );
+ cairo_font_options_destroy( cairoFontOptions );
- // Set font aliasing
- context = pango_layout_get_context( layout );
- cairoFontOptions = cairo_font_options_create();
- cairo_font_options_set_antialias( cairoFontOptions, aStream->text_anti_aliasing );
- pango_cairo_context_set_font_options( context, cairoFontOptions );
- pango_layout_context_changed( layout );
- cairo_font_options_destroy( cairoFontOptions );
+ // Save current transform matrix & clipping region
+ cairo_save( aStream->cairoContext );
- // Save current transform matrix & clipping region
- cairo_save( aStream->cairoContext );
+ // Set up the clipping region if we are doing text clipping
+ if ( aStream->text_clipping )
+ {
+ set_clip( pls );
+ }
- // Set up the clipping region if we are doing text clipping
- if ( aStream->text_clipping )
- {
- set_clip( pls );
- }
+ // Move to the string reference point
+ cairo_move_to( aStream->cairoContext, aStream->downscale * (double) args->x, aStream->downscale * (double) args->y );
- // Move to the string reference point
- cairo_move_to( aStream->cairoContext, aStream->downscale * (double) args->x, aStream->downscale * (double) args->y );
+ // Invert the coordinate system so that the text is drawn right side up
+ cairoTransformMatrix = (cairo_matrix_t *) malloc( sizeof ( cairo_matrix_t ) );
+ cairo_matrix_init( cairoTransformMatrix, 1.0, 0.0, 0.0, -1.0, 0.0, 0.0 );
+ cairo_transform( aStream->cairoContext, cairoTransformMatrix );
- // Invert the coordinate system so that the text is drawn right side up
- cairoTransformMatrix = (cairo_matrix_t *) malloc( sizeof ( cairo_matrix_t ) );
- cairo_matrix_init( cairoTransformMatrix, 1.0, 0.0, 0.0, -1.0, 0.0, 0.0 );
- cairo_transform( aStream->cairoContext, cairoTransformMatrix );
+ // Extract rotation angle and shear from the PLplot tranformation matrix.
+ // Compute sines and cosines of the angles as an optimization.
+ plRotationShear( args->xform, &rotation, &shear, &stride );
+ rotation -= pls->diorot * PI / 2.0;
+ cos_rot = cos( rotation );
+ sin_rot = sin( rotation );
+ cos_shear = cos( shear );
+ sin_shear = sin( shear );
- // Extract rotation angle and shear from the PLplot tranformation matrix.
- // Compute sines and cosines of the angles as an optimization.
- plRotationShear( args->xform, &rotation, &shear, &stride );
- rotation -= pls->diorot * PI / 2.0;
- cos_rot = cos( rotation );
- sin_rot = sin( rotation );
- cos_shear = cos( shear );
- sin_shear = sin( shear );
+ // Apply the transform matrix
+ cairo_matrix_init( cairoTransformMatrix,
+ cos_rot * stride,
+ -sin_rot * stride,
+ cos_rot * sin_shear + sin_rot * cos_shear,
+ -sin_rot * sin_shear + cos_rot * cos_shear,
+ 0, 0 );
+ cairo_transform( aStream->cairoContext, cairoTransformMatrix );
+ free( cairoTransformMatrix );
- // Apply the transform matrix
- cairo_matrix_init( cairoTransformMatrix,
- cos_rot * stride,
- -sin_rot * stride,
- cos_rot * sin_shear + sin_rot * cos_shear,
- -sin_rot * sin_shear + cos_rot * cos_shear,
- 0, 0 );
- cairo_transform( aStream->cairoContext, cairoTransformMatrix );
- free( cairoTransformMatrix );
+ // Move to the text starting point
+ // printf("baseline %d %d\n", baseline, textYExtent);
+ cairo_rel_move_to( aStream->cairoContext,
+ (double) ( -1.0 * args->just * (double) textXExtent ),
+ (double) 0.5 * aStream->fontSize - baseline / 1024.0 );
- // Move to the text starting point
- // printf("baseline %d %d\n", baseline, textYExtent);
- cairo_rel_move_to( aStream->cairoContext,
- (double) ( -1.0 * args->just * (double) textXExtent ),
- (double) 0.5 * aStream->fontSize - baseline / 1024.0 );
+ // Render the text
+ pango_cairo_show_layout( aStream->cairoContext, layout );
- // Render the text
- pango_cairo_show_layout( aStream->cairoContext, layout );
+ // Restore the transform matrix to its state prior to the text transform.
+ cairo_restore( aStream->cairoContext );
+ }
- // Restore the transform matrix to its state prior to the text transform.
- cairo_restore( aStream->cairoContext );
-
- // Free the layout object and the markup string.
+ // Free the layout object and the markup string
g_object_unref( layout );
free( aStream->pangoMarkupString );
}
@@ -2335,9 +2336,9 @@
// Dimension units are pts = 1/72 inches from cairo documentation.
aStream->cairoSurface = cairo_ps_surface_create_for_stream( (cairo_write_func_t) write_to_stream, pls->OutFile, (double) pls->ylength, (double) pls->xlength );
aStream->cairoContext = cairo_create( aStream->cairoSurface );
-
+
// Set the PS surface to be EPS.
- cairo_ps_surface_set_eps ( aStream->cairoSurface , 1 );
+ cairo_ps_surface_set_eps( aStream->cairoSurface, 1 );
// Save the pointer to the structure in the PLplot stream
pls->dev = aStream;
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