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colorscale: Don't free surface data before surface

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When drawing onto a recording surface, source surfaces get cached.

But if we g_free() the surface data after we're done, that cache is
gonna point at invalid data...
This commit is contained in:
Benjamin Otte 2018-03-25 22:37:09 +02:00
parent 98a9f2b3c1
commit 6bad307180
1 changed files with 6 additions and 7 deletions
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13
gtk/gtkcolorscale.c
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@ -90,9 +90,10 @@ gtk_color_scale_snapshot_trough (GtkColorScale *scale,
gdouble f;
int hue_x, hue_y;
stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
data = g_malloc (height * stride);
tmp = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
width, height);
stride = cairo_image_surface_get_stride (tmp);
data = (guint32* )cairo_image_surface_get_data (tmp);
f = 1.0 / (height - 1);
for (hue_y = 0; hue_y < height; hue_y++)
@ -105,18 +106,16 @@ gtk_color_scale_snapshot_trough (GtkColorScale *scale,
red = CLAMP (r * 255, 0, 255);
green = CLAMP (g * 255, 0, 255);
blue = CLAMP (b * 255, 0, 255);
p[hue_x] = (red << 16) | (green << 8) | blue;
p[hue_x] = 0xFF000000 | (red << 16) | (green << 8) | blue;
}
}
tmp = cairo_image_surface_create_for_data ((guchar *)data, CAIRO_FORMAT_RGB24,
width, height, stride);
cairo_surface_mark_dirty (tmp);
cairo_set_source_surface (cr, tmp, 0, 0);
cairo_paint (cr);
cairo_surface_destroy (tmp);
g_free (data);
}
else if (scale->priv->type == GTK_COLOR_SCALE_ALPHA)
{