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Manually clip bitmap area to be plotted. This speeds up rendering considerably. Currently only done for unscaled images. 

svn path=/trunk/netsurf/; revision=10297
This commit is contained in:
Michael Drake 2010-04-08 11:20:16 +00:00
parent bba7fbbd9b
commit 51b27bdf54
1 changed files with 54 additions and 10 deletions
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64
gtk/gtk_plotters.c
View File

@ -319,24 +319,68 @@ static bool nsgtk_plot_pixbuf(int x, int y, int width, int height,
* Does this matter?
*/
if (width == 0 || height == 0)
return true;
int x0, y0, x1, y1;
int src_x = 0;
int src_y = 0;
/* Bail early if we can */
if (width == 0 || height == 0)
/* Nothing to plot */
return true;
if ((x > (cliprect.x + cliprect.width)) ||
((x + width) < cliprect.x) ||
(y > (cliprect.y + cliprect.height)) ||
((y + height) < cliprect.y)) {
/* Image completely outside clip region */
return true;
}
/* Get clip rectangle / image rectangle edge differences */
x0 = cliprect.x - x;
y0 = cliprect.y - y;
x1 = (x + width) - (cliprect.x + cliprect.width);
y1 = (y + height) - (cliprect.y + cliprect.height);
/* Render the bitmap */
if (gdk_pixbuf_get_width(pixbuf) == width &&
gdk_pixbuf_get_height(pixbuf) == height) {
gdk_draw_pixbuf(current_drawable, current_gc,
pixbuf,
0, 0,
x, y,
width, height,
/* Bitmap is not scaled */
/* Manually clip to area of image to be rendered */
if (x0 > 0) {
/* Clip left */
src_x = x0;
x += x0;
width -= x0;
}
if (y0 > 0) {
/* Clip top */
src_y = y0;
y += y0;
height -= y0;
}
if (x1 > 0) {
/* Clip right */
width -= x1;
}
if (y1 > 0) {
/* Clip bottom */
height -= y1;
}
/* Plot the bitmap */
gdk_draw_pixbuf(current_drawable, current_gc, pixbuf,
src_x, src_y, x, y, width, height,
GDK_RGB_DITHER_MAX, 0, 0);
} else {
/* Bitmap is scaled */
GdkPixbuf *scaled;
scaled = gdk_pixbuf_scale_simple(pixbuf,
width, height,
option_render_resample ? GDK_INTERP_BILINEAR
: GDK_INTERP_NEAREST);
width, height,
option_render_resample ?
GDK_INTERP_BILINEAR :
GDK_INTERP_NEAREST);
if (!scaled)
return false;