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ngl: Use exact device scales for glyphs

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We are rendering the glyphs on a larger surface,
and we should avoid introducing unnecessary
rounding errors here. Also, I've found that
we always need to enlarge the surface by one
pixels in each direction to avoid cutting off
the tops of large glyphs.
This commit is contained in:
Matthias Clasen 2021-09-17 19:07:55 -04:00
parent e9cf8c6cc7
commit c6cacd2b2d
1 changed files with 12 additions and 15 deletions
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19
gsk/ngl/gsknglglyphlibrary.c
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@ -132,7 +132,8 @@ gsk_ngl_glyph_library_create_surface (GskNglGlyphLibrary *self,
int stride,
int width,
int height,
double device_scale)
int uwidth,
int uheight)
{
cairo_surface_t *surface;
gsize n_bytes;
@ -153,7 +154,7 @@ gsk_ngl_glyph_library_create_surface (GskNglGlyphLibrary *self,
surface = cairo_image_surface_create_for_data (self->surface_data,
CAIRO_FORMAT_ARGB32,
width, height, stride);
cairo_surface_set_device_scale (surface, device_scale, device_scale);
cairo_surface_set_device_scale (surface, width / (double)uwidth, height / (double)uheight);
return surface;
}
@ -192,7 +193,8 @@ gsk_ngl_glyph_library_upload_glyph (GskNglGlyphLibrary *self,
int y,
int width,
int height,
double device_scale)
int uwidth,
int uheight)
{
GskNglTextureLibrary *tl = (GskNglTextureLibrary *)self;
G_GNUC_UNUSED gint64 start_time = GDK_PROFILER_CURRENT_TIME;
@ -220,7 +222,7 @@ gsk_ngl_glyph_library_upload_glyph (GskNglGlyphLibrary *self,
"Uploading glyph %d",
key->glyph);
surface = gsk_ngl_glyph_library_create_surface (self, stride, width, height, device_scale);
surface = gsk_ngl_glyph_library_create_surface (self, stride, width, height, uwidth, uheight);
render_glyph (surface, scaled_font, key, value);
texture_id = GSK_NGL_TEXTURE_ATLAS_ENTRY_TEXTURE (value);
@ -289,16 +291,10 @@ gsk_ngl_glyph_library_add (GskNglGlyphLibrary *self,
pango_font_get_glyph_extents (key->font, key->glyph, &ink_rect, NULL);
pango_extents_to_pixels (&ink_rect, NULL);
if (key->xshift != 0)
{
ink_rect.x -= 1;
ink_rect.width += 2;
}
if (key->yshift != 0)
{
ink_rect.y -= 1;
ink_rect.height += 2;
}
width = (int) ceil (ink_rect.width * key->scale / 1024.0);
height = (int) ceil (ink_rect.height * key->scale / 1024.0);
@ -321,7 +317,8 @@ gsk_ngl_glyph_library_add (GskNglGlyphLibrary *self,
packed_y + 1,
width,
height,
key->scale / 1024.0);
ink_rect.width,
ink_rect.height);
*out_value = value;