void
sp_canvas_arena_render_surface (SPCanvasArena *ca, cairo_surface_t *surface, Geom::IntRect const &r)
{
g_return_if_fail (ca != NULL);
g_return_if_fail (SP_IS_CANVAS_ARENA (ca));
Inkscape::DrawingContext dc(surface, r.min());
ca->drawing.update(Geom::IntRect::infinite(), ca->ctx);
ca->drawing.render(dc, r);
}
static int
sp_export_get_rows(guchar const **rows, void **to_free, int row, int num_rows, void *data)
{
struct SPEBP *ebp = (struct SPEBP *) data;
if (ebp->status) {
if (!ebp->status((float) row / ebp->height, ebp->data)) return 0;
}
num_rows = MIN(num_rows, static_cast<int>(ebp->sheight));
num_rows = MIN(num_rows, static_cast<int>(ebp->height - row));
/* Set area of interest */
// bbox is now set to the entire image to prevent discontinuities
// in the image when blur is used (the borders may still be a bit
// off, but that's less noticeable).
Geom::IntRect bbox = Geom::IntRect::from_xywh(0, row, ebp->width, num_rows);
/* Update to renderable state */
ebp->drawing->update(bbox);
int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, ebp->width);
unsigned char *px = g_new(guchar, num_rows * stride);
cairo_surface_t *s = cairo_image_surface_create_for_data(
px, CAIRO_FORMAT_ARGB32, ebp->width, num_rows, stride);
Inkscape::DrawingContext ct(s, bbox.min());
ct.setSource(ebp->background);
ct.setOperator(CAIRO_OPERATOR_SOURCE);
ct.paint();
ct.setOperator(CAIRO_OPERATOR_OVER);
/* Render */
ebp->drawing->render(ct, bbox);
cairo_surface_destroy(s);
*to_free = px;
// PNG stores data as unpremultiplied big-endian RGBA, which means
// it's identical to the GdkPixbuf format.
convert_pixels_argb32_to_pixbuf(px, ebp->width, num_rows, stride);
for (int r = 0; r < num_rows; r++) {
rows[r] = px + r * stride;
}
return num_rows;
}
/**
* Creates a surface with the given physical extents.
* When a drawing context is created for this surface, its pixels
* will cover the area under the given rectangle.
*/
DrawingSurface::DrawingSurface(Geom::IntRect const &area)
: _surface(NULL)
, _origin(area.min())
, _scale(1, 1)
, _pixels(area.dimensions())
{}