#include "view-cairo.hh"
+#include <assert.h>
+
+
void
-view_cairo_t::get_surface_size (cairo_scaled_font_t *scaled_font,
- double *w, double *h)
+view_cairo_t::render (const font_options_t *font_opts)
{
- cairo_font_extents_t font_extents;
+ bool vertical = HB_DIRECTION_IS_VERTICAL (direction);
+ int vert = vertical ? 1 : 0;
+ int horiz = vertical ? 0 : 1;
- cairo_scaled_font_extents (scaled_font, &font_extents);
+ int x_sign = font_opts->font_size_x < 0 ? -1 : +1;
+ int y_sign = font_opts->font_size_y < 0 ? -1 : +1;
- bool vertical = HB_DIRECTION_IS_VERTICAL (direction);
- (vertical ? *w : *h) = (int) lines->len * (font_extents.height + view_options.line_space) - view_options.line_space;
- (vertical ? *h : *w) = 0;
+ cairo_scaled_font_t *scaled_font = helper_cairo_create_scaled_font (font_opts);
+ cairo_font_extents_t font_extents;
+ cairo_scaled_font_extents (scaled_font, &font_extents);
+ /* Looks like cairo doesn't negate the sign of font extents even if
+ * y_scale is negative. This is probably a bug, but that's the way
+ * it is, and we code for it. Assert, just in case this accidentally
+ * changes in the future (or is different on non-FreeType cairo font
+ * backends. */
+ assert (font_extents.height >= 0);
+ double leading = font_extents.height + view_options.line_space;
+
+ /* Calculate surface size. */
+ double w, h;
+ (vertical ? w : h) = (int) lines->len * leading - view_options.line_space;
+ (vertical ? h : w) = 0;
for (unsigned int i = 0; i < lines->len; i++) {
helper_cairo_line_t &line = g_array_index (lines, helper_cairo_line_t, i);
double x_advance, y_advance;
line.get_advance (&x_advance, &y_advance);
if (vertical)
- *h = MAX (*h, y_advance);
+ h = MAX (h, y_sign * y_advance);
else
- *w = MAX (*w, x_advance);
+ w = MAX (w, x_sign * x_advance);
}
- *w += view_options.margin.l + view_options.margin.r;
- *h += view_options.margin.t + view_options.margin.b;
-}
-
-void
-view_cairo_t::render (const font_options_t *font_opts)
-{
- cairo_scaled_font_t *scaled_font = helper_cairo_create_scaled_font (font_opts);
- double w, h;
- get_surface_size (scaled_font, &w, &h);
- cairo_t *cr = helper_cairo_create_context (w, h, &view_options, &output_options);
+ /* Create surface. */
+ cairo_t *cr = helper_cairo_create_context (w + view_options.margin.l + view_options.margin.r,
+ h + view_options.margin.t + view_options.margin.b,
+ &view_options, &output_options);
cairo_set_scaled_font (cr, scaled_font);
- cairo_scaled_font_destroy (scaled_font);
-
- draw (cr);
- helper_cairo_destroy_context (cr);
-}
-
-void
-view_cairo_t::draw (cairo_t *cr)
-{
- cairo_save (cr);
-
- bool vertical = HB_DIRECTION_IS_VERTICAL (direction);
- int v = vertical ? 1 : 0;
- int h = vertical ? 0 : 1;
- cairo_font_extents_t font_extents;
- cairo_font_extents (cr, &font_extents);
+ /* Setup coordinate system. */
cairo_translate (cr, view_options.margin.l, view_options.margin.t);
if (vertical)
- cairo_translate (cr, font_extents.height * (lines->len + .5), 0);
+ cairo_translate (cr,
+ w /* We stack lines right to left */
+ -font_extents.height * .5 /* "ascent" for vertical */,
+ y_sign < 0 ? h : 0);
else
- cairo_translate (cr, 0, -(font_extents.height - font_extents.ascent));
+ {
+ cairo_translate (cr,
+ x_sign < 0 ? w : 0,
+ y_sign < 0 ? font_extents.descent : font_extents.ascent);
+ }
+
+ /* Draw. */
+ cairo_translate (cr, +vert * leading, -horiz * leading);
for (unsigned int i = 0; i < lines->len; i++)
{
helper_cairo_line_t &l = g_array_index (lines, helper_cairo_line_t, i);
- if (i)
- cairo_translate (cr, v * -view_options.line_space, h * view_options.line_space);
-
- cairo_translate (cr, v * -font_extents.height, h * font_extents.height);
+ cairo_translate (cr, -vert * leading, +horiz * leading);
if (view_options.annotate) {
cairo_save (cr);
cairo_show_glyphs (cr, l.glyphs, l.num_glyphs);
}
- cairo_restore (cr);
+ /* Clean up. */
+ helper_cairo_destroy_context (cr);
+ cairo_scaled_font_destroy (scaled_font);
}