Attachment 8235 Details for Bug 9467 – patch 3/3. Implements initialising the glyph mask surface.

[patch] patch 3/3. Implements initialising the glyph mask surface.

glyph-surface-patch-3.txt (text/plain), 4.75 KB, created by Brian Ewins on 2006-12-28 06:09:03 UTC

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Creator: Brian Ewins

Created: 2006-12-28 06:09:03 UTC

Size: 4.75 KB

patch

obsolete

>[ATSUI] Implement the glyph mask surface fallback.
>
>---
>commit 01475e757e82d9de8c7af9ba4714dd9aa55134b3
>tree 24049d0893150ab35cf5941e5c5c0676eefbf93f
>parent 84643733917a2e5a3c9421142ae174758f7e62be
>author Brian Ewins <Brian.Ewins@gmail.com> Thu, 28 Dec 2006 13:30:50 +0000
>committer Brian Ewins <Brian.Ewins@gmail.com> Thu, 28 Dec 2006 13:30:50 +0000
>
> src/cairo-atsui-font.c |  113 +++++++++++++++++++++++++++++++++++++++++++++++-
> 1 files changed, 111 insertions(+), 2 deletions(-)
>
>diff --git a/src/cairo-atsui-font.c b/src/cairo-atsui-font.c
>index b85c935..cb4fdad 100644
>--- a/src/cairo-atsui-font.c
>+++ b/src/cairo-atsui-font.c
>@@ -606,9 +606,118 @@ _cairo_atsui_scaled_font_init_glyph_path
> 
> static cairo_status_t
> _cairo_atsui_scaled_font_init_glyph_surface (cairo_atsui_font_t *scaled_font,
>-					  cairo_scaled_glyph_t *scaled_glyph)
>+					     cairo_scaled_glyph_t *scaled_glyph)
> {
>-    return CAIRO_INT_STATUS_UNSUPPORTED;
>+    OSStatus err;
>+    CGContextRef drawingContext;
>+    cairo_image_surface_t *surface;
>+    cairo_format_t format;
>+
>+    ATSFontRef atsFont;
>+    CGFontRef cgFont;
>+    cairo_scaled_font_t base = scaled_font->base;
>+    cairo_font_extents_t extents = base.extents;
>+
>+    GlyphID theGlyph = _cairo_scaled_glyph_index (scaled_glyph);
>+    ATSGlyphScreenMetrics metricsH;
>+    double left, bottom, width, height;
>+    double xscale, yscale;
>+    CGRect bbox;
>+    CGAffineTransform transform;
>+
>+
>+    /* Compute a box to contain the glyph mask. The vertical
>+     * sizes come from the font extents; extra pixels are 
>+     * added to account for fractional sizes.
>+     */
>+    height = extents.ascent + extents.descent + 2.0;
>+    bottom = -extents.descent - 1.0;
>+
>+    /* Horizontal sizes come from the glyph typographic metrics.
>+     * It is possible that this might result in clipped text
>+     * in fonts where the typographic bounds don't cover the ink.
>+     * The width is recalculated, since metricsH.width is rounded.
>+     */
>+    err = ATSUGlyphGetScreenMetrics (scaled_font->style,
>+				     1, &theGlyph, 0, false, 
>+				     false, &metricsH);    
>+    left = metricsH.sideBearing.x - 1.0;
>+    width = metricsH.deviceAdvance.x 
>+	- metricsH.sideBearing.x 
>+	+ metricsH.otherSideBearing.x + 2.0;
>+
>+    /* The xy and yx components are negated because the y-axis
>+     * is flipped into the cairo system then flipped back, ie:
>+     * [1  0][xx yx][1  0]
>+     * [0 -1][xy yy][0 -1]
>+     */
>+    transform = CGAffineTransformMake (base.scale.xx, 
>+				      -base.scale.yx, 
>+				      -base.scale.xy, 
>+				      base.scale.yy, 
>+				      0., 0.);
>+    _cairo_matrix_compute_scale_factors (&base.scale, 
>+					&xscale, &yscale, 1);
>+    transform = CGAffineTransformScale (transform, 1.0/xscale, 1.0/yscale);
>+
>+    /* Rotate the bounding box. This computes the smallest CGRect
>+     * that would contain the bounding box after rotation.
>+     */
>+    bbox = CGRectApplyAffineTransform (CGRectMake (left, bottom, 
>+						   width, height), transform);
>+    /* Compute the smallest CGRect with  integer coordinates
>+     * that contains the bounding box.
>+     */
>+    bbox = CGRectIntegral (bbox);
>+
>+    left = CGRectGetMinX (bbox);
>+    bottom = CGRectGetMinY (bbox);
>+
>+    /* XXX should we select format based on antialiasing flags, as ft does? */
>+    format = CAIRO_FORMAT_A8;
>+
>+    /* create the glyph mask surface */
>+    surface = (cairo_image_surface_t *)cairo_image_surface_create (format, bbox.size.width, bbox.size.height);
>+    if (!surface)
>+	return CAIRO_STATUS_NO_MEMORY;
>+
>+    drawingContext = CGBitmapContextCreateWithCairoImageSurface (surface);
>+    if (!drawingContext) {
>+	cairo_surface_destroy ((cairo_surface_t *)surface);
>+	return CAIRO_INT_STATUS_UNSUPPORTED;
>+    }
>+    
>+    atsFont = FMGetATSFontRefFromFont (scaled_font->fontID);
>+    cgFont = CGFontCreateWithPlatformFont (&atsFont);
>+
>+    CGContextSetFont (drawingContext, cgFont);
>+
>+    if (base.options.antialias ==  CAIRO_ANTIALIAS_NONE) {
>+    	CGContextSetShouldAntialias (drawingContext, false);
>+    }
>+
>+    /* solid white */
>+    CGContextSetRGBFillColor (drawingContext, 1.0, 1.0, 1.0, 1.0);
>+
>+    CGContextSetFontSize (drawingContext, 1.0);
>+    CGContextTranslateCTM (drawingContext, -left, -bottom);
>+    CGContextScaleCTM (drawingContext, xscale, yscale);
>+    CGContextSetTextMatrix (drawingContext, transform);
>+    CGContextShowGlyphsAtPoint (drawingContext, 0, 0,  
>+				&theGlyph, 1);
>+
>+    CGContextRelease (drawingContext);
>+
>+    /* correct for difference between cairo and quartz 
>+     * coordinate systems.
>+     */
>+    cairo_surface_set_device_offset ((cairo_surface_t *)surface, left, 
>+				    -bbox.size.height - bottom);
>+    _cairo_scaled_glyph_set_surface (scaled_glyph,
>+				     &base,
>+				     surface);
>+
>+    return CAIRO_STATUS_SUCCESS;
> }
> 
> static cairo_int_status_t

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