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mutter/cogl/cogl-pango/cogl-pango-render.c
Florian Müllner ed10aea44d cogl-pango: Special case alpha of 0 
pango_renderer_get_alpha() returns 0 to indicate that the alpha value
should be inherited from the environment, but we are passing it on
(and therefore making the text fully translucent).

Instead, make the text fully opaque as expected.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1156
2020-03-28 01:04:17 +01:00

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/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2008 OpenedHand
* Copyright (C) 2012 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
* Robert Bragg <robert@linux.intel.com>
* Matthew Allum <mallum@openedhand.com>
*/
#include "cogl-config.h"
#ifndef PANGO_ENABLE_BACKEND
#define PANGO_ENABLE_BACKEND 1
#endif
#ifndef PANGO_UNKNOWN_GLYPH_WIDTH
#define PANGO_UNKNOWN_GLYPH_WIDTH 10
#endif
#ifndef PANGO_UNKNOWN_GLYPH_HEIGHT
#define PANGO_UNKNOWN_GLYPH_HEIGHT 14
#endif
#include <pango/pango-fontmap.h>
#include <pango/pangocairo.h>
#include <pango/pango-renderer.h>
#include <cairo.h>
#include <cairo-ft.h>
#include "cogl/cogl-debug.h"
#include "cogl/cogl-context-private.h"
#include "cogl/cogl-texture-private.h"
#include "cogl-pango-private.h"
#include "cogl-pango-glyph-cache.h"
#include "cogl-pango-display-list.h"
enum
{
PROP_0,
PROP_COGL_CONTEXT,
PROP_LAST
};
typedef struct
{
CoglPangoGlyphCache *glyph_cache;
CoglPangoPipelineCache *pipeline_cache;
} CoglPangoRendererCaches;
struct _CoglPangoRenderer
{
PangoRenderer parent_instance;
CoglContext *ctx;
/* Two caches of glyphs as textures and their corresponding pipeline
caches, one with mipmapped textures and one without */
CoglPangoRendererCaches no_mipmap_caches;
CoglPangoRendererCaches mipmap_caches;
gboolean use_mipmapping;
/* The current display list that is being built */
CoglPangoDisplayList *display_list;
};
struct _CoglPangoRendererClass
{
PangoRendererClass class_instance;
};
typedef struct _CoglPangoLayoutQdata CoglPangoLayoutQdata;
/* An instance of this struct gets attached to each PangoLayout to
cache the VBO and to detect changes to the layout */
struct _CoglPangoLayoutQdata
{
CoglPangoRenderer *renderer;
/* The cache of the geometry for the layout */
CoglPangoDisplayList *display_list;
/* A reference to the first line of the layout. This is just used to
detect changes */
PangoLayoutLine *first_line;
/* Whether mipmapping was previously used to render this layout. We
need to regenerate the display list if the mipmapping value is
changed because it will be using a different set of textures */
gboolean mipmapping_used;
};
static void
_cogl_pango_ensure_glyph_cache_for_layout_line (PangoLayoutLine *line);
typedef struct
{
CoglPangoDisplayList *display_list;
float x1, y1, x2, y2;
} CoglPangoRendererSliceCbData;
PangoRenderer *
_cogl_pango_renderer_new (CoglContext *context)
{
return PANGO_RENDERER (g_object_new (COGL_PANGO_TYPE_RENDERER,
"context", context, NULL));
}
static void
cogl_pango_renderer_slice_cb (CoglTexture *texture,
const float *slice_coords,
const float *virtual_coords,
void *user_data)
{
CoglPangoRendererSliceCbData *data = user_data;
/* Note: this assumes that there is only one slice containing the
whole texture and it doesn't attempt to split up the vertex
coordinates based on the virtual_coords */
_cogl_pango_display_list_add_texture (data->display_list,
texture,
data->x1,
data->y1,
data->x2,
data->y2,
slice_coords[0],
slice_coords[1],
slice_coords[2],
slice_coords[3]);
}
static void
cogl_pango_renderer_draw_glyph (CoglPangoRenderer *priv,
CoglPangoGlyphCacheValue *cache_value,
float x1,
float y1)
{
CoglPangoRendererSliceCbData data;
g_return_if_fail (priv->display_list != NULL);
data.display_list = priv->display_list;
data.x1 = x1;
data.y1 = y1;
data.x2 = x1 + (float) cache_value->draw_width;
data.y2 = y1 + (float) cache_value->draw_height;
/* We iterate the internal sub textures of the texture so that we
can get a pointer to the base texture even if the texture is in
the global atlas. That way the display list can recognise that
the neighbouring glyphs are coming from the same atlas and bundle
them together into a single VBO */
cogl_meta_texture_foreach_in_region (COGL_META_TEXTURE (cache_value->texture),
cache_value->tx1,
cache_value->ty1,
cache_value->tx2,
cache_value->ty2,
COGL_PIPELINE_WRAP_MODE_REPEAT,
COGL_PIPELINE_WRAP_MODE_REPEAT,
cogl_pango_renderer_slice_cb,
&data);
}
static void cogl_pango_renderer_dispose (GObject *object);
static void cogl_pango_renderer_finalize (GObject *object);
static void cogl_pango_renderer_draw_glyphs (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int x,
int y);
static void cogl_pango_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height);
static void cogl_pango_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
double y1,
double x11,
double x21,
double y2,
double x12,
double x22);
G_DEFINE_TYPE (CoglPangoRenderer, cogl_pango_renderer, PANGO_TYPE_RENDERER);
static void
cogl_pango_renderer_init (CoglPangoRenderer *priv)
{
}
static void
_cogl_pango_renderer_constructed (GObject *gobject)
{
CoglPangoRenderer *renderer = COGL_PANGO_RENDERER (gobject);
CoglContext *ctx = renderer->ctx;
renderer->no_mipmap_caches.pipeline_cache =
_cogl_pango_pipeline_cache_new (ctx, FALSE);
renderer->mipmap_caches.pipeline_cache =
_cogl_pango_pipeline_cache_new (ctx, TRUE);
renderer->no_mipmap_caches.glyph_cache =
cogl_pango_glyph_cache_new (ctx, FALSE);
renderer->mipmap_caches.glyph_cache =
cogl_pango_glyph_cache_new (ctx, TRUE);
_cogl_pango_renderer_set_use_mipmapping (renderer, FALSE);
if (G_OBJECT_CLASS (cogl_pango_renderer_parent_class)->constructed)
G_OBJECT_CLASS (cogl_pango_renderer_parent_class)->constructed (gobject);
}
static void
cogl_pango_renderer_set_property (GObject *object,
unsigned int prop_id,
const GValue *value,
GParamSpec *pspec)
{
CoglPangoRenderer *renderer = COGL_PANGO_RENDERER (object);
switch (prop_id)
{
case PROP_COGL_CONTEXT:
renderer->ctx = g_value_get_pointer (value);
cogl_object_ref (renderer->ctx);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
cogl_pango_renderer_class_init (CoglPangoRendererClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
GParamSpec *pspec;
object_class->set_property = cogl_pango_renderer_set_property;
object_class->constructed = _cogl_pango_renderer_constructed;
object_class->dispose = cogl_pango_renderer_dispose;
object_class->finalize = cogl_pango_renderer_finalize;
pspec = g_param_spec_pointer ("context",
"Context",
"The Cogl Context",
G_PARAM_WRITABLE |
G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_property (object_class, PROP_COGL_CONTEXT, pspec);
renderer_class->draw_glyphs = cogl_pango_renderer_draw_glyphs;
renderer_class->draw_rectangle = cogl_pango_renderer_draw_rectangle;
renderer_class->draw_trapezoid = cogl_pango_renderer_draw_trapezoid;
}
static void
cogl_pango_renderer_dispose (GObject *object)
{
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (object);
if (priv->ctx)
{
cogl_object_unref (priv->ctx);
priv->ctx = NULL;
}
}
static void
cogl_pango_renderer_finalize (GObject *object)
{
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (object);
cogl_pango_glyph_cache_free (priv->no_mipmap_caches.glyph_cache);
cogl_pango_glyph_cache_free (priv->mipmap_caches.glyph_cache);
_cogl_pango_pipeline_cache_free (priv->no_mipmap_caches.pipeline_cache);
_cogl_pango_pipeline_cache_free (priv->mipmap_caches.pipeline_cache);
G_OBJECT_CLASS (cogl_pango_renderer_parent_class)->finalize (object);
}
static CoglPangoRenderer *
cogl_pango_get_renderer_from_context (PangoContext *context)
{
PangoFontMap *font_map;
CoglPangoFontMap *cogl_font_map;
PangoRenderer *renderer;
font_map = pango_context_get_font_map (context);
g_return_val_if_fail (COGL_PANGO_IS_FONT_MAP (font_map), NULL);
cogl_font_map = COGL_PANGO_FONT_MAP (font_map);
renderer = _cogl_pango_font_map_get_renderer (cogl_font_map);
g_return_val_if_fail (COGL_PANGO_IS_RENDERER (renderer), NULL);
return COGL_PANGO_RENDERER (renderer);
}
static GQuark
cogl_pango_layout_get_qdata_key (void)
{
static GQuark key = 0;
if (G_UNLIKELY (key == 0))
key = g_quark_from_static_string ("CoglPangoDisplayList");
return key;
}
static void
cogl_pango_layout_qdata_forget_display_list (CoglPangoLayoutQdata *qdata)
{
if (qdata->display_list)
{
CoglPangoRendererCaches *caches = qdata->mipmapping_used ?
&qdata->renderer->mipmap_caches :
&qdata->renderer->no_mipmap_caches;
_cogl_pango_glyph_cache_remove_reorganize_callback
(caches->glyph_cache,
(GHookFunc) cogl_pango_layout_qdata_forget_display_list,
qdata);
_cogl_pango_display_list_free (qdata->display_list);
qdata->display_list = NULL;
}
}
static void
cogl_pango_render_qdata_destroy (CoglPangoLayoutQdata *qdata)
{
cogl_pango_layout_qdata_forget_display_list (qdata);
if (qdata->first_line)
pango_layout_line_unref (qdata->first_line);
g_slice_free (CoglPangoLayoutQdata, qdata);
}
void
cogl_pango_show_layout (CoglFramebuffer *fb,
PangoLayout *layout,
float x,
float y,
const CoglColor *color)
{
PangoContext *context;
CoglPangoRenderer *priv;
CoglPangoLayoutQdata *qdata;
context = pango_layout_get_context (layout);
priv = cogl_pango_get_renderer_from_context (context);
if (G_UNLIKELY (!priv))
return;
qdata = g_object_get_qdata (G_OBJECT (layout),
cogl_pango_layout_get_qdata_key ());
if (qdata == NULL)
{
qdata = g_slice_new0 (CoglPangoLayoutQdata);
qdata->renderer = priv;
g_object_set_qdata_full (G_OBJECT (layout),
cogl_pango_layout_get_qdata_key (),
qdata,
(GDestroyNotify)
cogl_pango_render_qdata_destroy);
}
/* Check if the layout has changed since the last build of the
display list. This trick was suggested by Behdad Esfahbod here:
http://mail.gnome.org/archives/gtk-i18n-list/2009-May/msg00019.html */
if (qdata->display_list &&
((qdata->first_line &&
qdata->first_line->layout != layout) ||
qdata->mipmapping_used != priv->use_mipmapping))
cogl_pango_layout_qdata_forget_display_list (qdata);
if (qdata->display_list == NULL)
{
CoglPangoRendererCaches *caches = priv->use_mipmapping ?
&priv->mipmap_caches :
&priv->no_mipmap_caches;
cogl_pango_ensure_glyph_cache_for_layout (layout);
qdata->display_list =
_cogl_pango_display_list_new (caches->pipeline_cache);
/* Register for notification of when the glyph cache changes so
we can rebuild the display list */
_cogl_pango_glyph_cache_add_reorganize_callback
(caches->glyph_cache,
(GHookFunc) cogl_pango_layout_qdata_forget_display_list,
qdata);
priv->display_list = qdata->display_list;
pango_renderer_draw_layout (PANGO_RENDERER (priv), layout, 0, 0);
priv->display_list = NULL;
qdata->mipmapping_used = priv->use_mipmapping;
}
cogl_framebuffer_push_matrix (fb);
cogl_framebuffer_translate (fb, x, y, 0);
_cogl_pango_display_list_render (fb,
qdata->display_list,
color);
cogl_framebuffer_pop_matrix (fb);
/* Keep a reference to the first line of the layout so we can detect
changes */
if (qdata->first_line)
{
pango_layout_line_unref (qdata->first_line);
qdata->first_line = NULL;
}
if (pango_layout_get_line_count (layout) > 0)
{
qdata->first_line = pango_layout_get_line (layout, 0);
pango_layout_line_ref (qdata->first_line);
}
}
void
cogl_pango_show_layout_line (CoglFramebuffer *fb,
PangoLayoutLine *line,
float x,
float y,
const CoglColor *color)
{
PangoContext *context;
CoglPangoRenderer *priv;
CoglPangoRendererCaches *caches;
int pango_x = x * PANGO_SCALE;
int pango_y = y * PANGO_SCALE;
context = pango_layout_get_context (line->layout);
priv = cogl_pango_get_renderer_from_context (context);
if (G_UNLIKELY (!priv))
return;
caches = (priv->use_mipmapping ?
&priv->mipmap_caches :
&priv->no_mipmap_caches);
priv->display_list = _cogl_pango_display_list_new (caches->pipeline_cache);
_cogl_pango_ensure_glyph_cache_for_layout_line (line);
pango_renderer_draw_layout_line (PANGO_RENDERER (priv), line,
pango_x, pango_y);
_cogl_pango_display_list_render (fb,
priv->display_list,
color);
_cogl_pango_display_list_free (priv->display_list);
priv->display_list = NULL;
}
void
_cogl_pango_renderer_clear_glyph_cache (CoglPangoRenderer *renderer)
{
cogl_pango_glyph_cache_clear (renderer->mipmap_caches.glyph_cache);
cogl_pango_glyph_cache_clear (renderer->no_mipmap_caches.glyph_cache);
}
void
_cogl_pango_renderer_set_use_mipmapping (CoglPangoRenderer *renderer,
gboolean value)
{
renderer->use_mipmapping = value;
}
gboolean
_cogl_pango_renderer_get_use_mipmapping (CoglPangoRenderer *renderer)
{
return renderer->use_mipmapping;
}
static CoglPangoGlyphCacheValue *
cogl_pango_renderer_get_cached_glyph (PangoRenderer *renderer,
gboolean create,
PangoFont *font,
PangoGlyph glyph)
{
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
CoglPangoRendererCaches *caches = (priv->use_mipmapping ?
&priv->mipmap_caches :
&priv->no_mipmap_caches);
return cogl_pango_glyph_cache_lookup (caches->glyph_cache,
create, font, glyph);
}
static gboolean
font_has_color_glyphs (const PangoFont *font)
{
cairo_scaled_font_t *scaled_font;
gboolean has_color = FALSE;
scaled_font = pango_cairo_font_get_scaled_font ((PangoCairoFont *) font);
if (cairo_scaled_font_get_type (scaled_font) == CAIRO_FONT_TYPE_FT)
{
FT_Face ft_face = cairo_ft_scaled_font_lock_face (scaled_font);
has_color = (FT_HAS_COLOR (ft_face) != 0);
cairo_ft_scaled_font_unlock_face (scaled_font);
}
return has_color;
}
static void
cogl_pango_renderer_set_dirty_glyph (PangoFont *font,
PangoGlyph glyph,
CoglPangoGlyphCacheValue *value)
{
cairo_surface_t *surface;
cairo_t *cr;
cairo_scaled_font_t *scaled_font;
cairo_glyph_t cairo_glyph;
cairo_format_t format_cairo;
CoglPixelFormat format_cogl;
COGL_NOTE (PANGO, "redrawing glyph %i", glyph);
/* Glyphs that don't take up any space will end up without a
texture. These should never become dirty so they shouldn't end up
here */
g_return_if_fail (value->texture != NULL);
if (_cogl_texture_get_format (value->texture) == COGL_PIXEL_FORMAT_A_8)
{
format_cairo = CAIRO_FORMAT_A8;
format_cogl = COGL_PIXEL_FORMAT_A_8;
}
else
{
format_cairo = CAIRO_FORMAT_ARGB32;
/* Cairo stores the data in native byte order as ARGB but Cogl's
pixel formats specify the actual byte order. Therefore we
need to use a different format depending on the
architecture */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
format_cogl = COGL_PIXEL_FORMAT_BGRA_8888_PRE;
#else
format_cogl = COGL_PIXEL_FORMAT_ARGB_8888_PRE;
#endif
}
surface = cairo_image_surface_create (format_cairo,
value->draw_width,
value->draw_height);
cr = cairo_create (surface);
scaled_font = pango_cairo_font_get_scaled_font (PANGO_CAIRO_FONT (font));
cairo_set_scaled_font (cr, scaled_font);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 1.0);
cairo_glyph.x = -value->draw_x;
cairo_glyph.y = -value->draw_y;
/* The PangoCairo glyph numbers directly map to Cairo glyph
numbers */
cairo_glyph.index = glyph;
cairo_show_glyphs (cr, &cairo_glyph, 1);
cairo_destroy (cr);
cairo_surface_flush (surface);
/* Copy the glyph to the texture */
cogl_texture_set_region (value->texture,
0, /* src_x */
0, /* src_y */
value->tx_pixel, /* dst_x */
value->ty_pixel, /* dst_y */
value->draw_width, /* dst_width */
value->draw_height, /* dst_height */
value->draw_width, /* width */
value->draw_height, /* height */
format_cogl,
cairo_image_surface_get_stride (surface),
cairo_image_surface_get_data (surface));
cairo_surface_destroy (surface);
value->has_color = font_has_color_glyphs (font);
}
static void
_cogl_pango_ensure_glyph_cache_for_layout_line_internal (PangoLayoutLine *line)
{
PangoContext *context;
PangoRenderer *renderer;
GSList *l;
context = pango_layout_get_context (line->layout);
renderer =
PANGO_RENDERER (cogl_pango_get_renderer_from_context (context));
for (l = line->runs; l; l = l->next)
{
PangoLayoutRun *run = l->data;
PangoGlyphString *glyphs = run->glyphs;
int i;
for (i = 0; i < glyphs->num_glyphs; i++)
{
PangoGlyphInfo *gi = &glyphs->glyphs[i];
/* If the glyph isn't cached then this will reserve
space for it now. We won't actually draw the glyph
yet because reserving space could cause all of the
other glyphs to be moved so we might as well redraw
them all later once we know that the position is
settled */
cogl_pango_renderer_get_cached_glyph (renderer, TRUE,
run->item->analysis.font,
gi->glyph);
}
}
}
static void
_cogl_pango_set_dirty_glyphs (CoglPangoRenderer *priv)
{
_cogl_pango_glyph_cache_set_dirty_glyphs
(priv->mipmap_caches.glyph_cache, cogl_pango_renderer_set_dirty_glyph);
_cogl_pango_glyph_cache_set_dirty_glyphs
(priv->no_mipmap_caches.glyph_cache, cogl_pango_renderer_set_dirty_glyph);
}
static void
_cogl_pango_ensure_glyph_cache_for_layout_line (PangoLayoutLine *line)
{
PangoContext *context;
CoglPangoRenderer *priv;
context = pango_layout_get_context (line->layout);
priv = cogl_pango_get_renderer_from_context (context);
_cogl_pango_ensure_glyph_cache_for_layout_line_internal (line);
/* Now that we know all of the positions are settled we'll fill in
any dirty glyphs */
_cogl_pango_set_dirty_glyphs (priv);
}
void
cogl_pango_ensure_glyph_cache_for_layout (PangoLayout *layout)
{
PangoContext *context;
CoglPangoRenderer *priv;
PangoLayoutIter *iter;
context = pango_layout_get_context (layout);
priv = cogl_pango_get_renderer_from_context (context);
g_return_if_fail (PANGO_IS_LAYOUT (layout));
if ((iter = pango_layout_get_iter (layout)) == NULL)
return;
do
{
PangoLayoutLine *line;
line = pango_layout_iter_get_line_readonly (iter);
_cogl_pango_ensure_glyph_cache_for_layout_line_internal (line);
}
while (pango_layout_iter_next_line (iter));
pango_layout_iter_free (iter);
/* Now that we know all of the positions are settled we'll fill in
any dirty glyphs */
_cogl_pango_set_dirty_glyphs (priv);
}
static void
cogl_pango_renderer_set_color_for_part (PangoRenderer *renderer,
PangoRenderPart part)
{
PangoColor *pango_color = pango_renderer_get_color (renderer, part);
uint16_t alpha = pango_renderer_get_alpha (renderer, part);
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
if (pango_color)
{
CoglColor color;
cogl_color_init_from_4ub (&color,
pango_color->red >> 8,
pango_color->green >> 8,
pango_color->blue >> 8,
alpha ? alpha >> 8 : 0xff);
_cogl_pango_display_list_set_color_override (priv->display_list, &color);
}
else
_cogl_pango_display_list_remove_color_override (priv->display_list);
}
static void
cogl_pango_renderer_draw_box (PangoRenderer *renderer,
int x,
int y,
int width,
int height)
{
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
g_return_if_fail (priv->display_list != NULL);
_cogl_pango_display_list_add_rectangle (priv->display_list,
x,
y - height,
x + width,
y);
}
static void
cogl_pango_renderer_get_device_units (PangoRenderer *renderer,
int xin,
int yin,
float *xout,
float *yout)
{
const PangoMatrix *matrix;
if ((matrix = pango_renderer_get_matrix (renderer)))
{
/* Convert user-space coords to device coords */
*xout = ((xin * matrix->xx + yin * matrix->xy)
/ PANGO_SCALE + matrix->x0);
*yout = ((yin * matrix->yy + xin * matrix->yx)
/ PANGO_SCALE + matrix->y0);
}
else
{
*xout = PANGO_PIXELS (xin);
*yout = PANGO_PIXELS (yin);
}
}
static void
cogl_pango_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height)
{
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
float x1, x2, y1, y2;
g_return_if_fail (priv->display_list != NULL);
cogl_pango_renderer_set_color_for_part (renderer, part);
cogl_pango_renderer_get_device_units (renderer,
x, y,
&x1, &y1);
cogl_pango_renderer_get_device_units (renderer,
x + width, y + height,
&x2, &y2);
_cogl_pango_display_list_add_rectangle (priv->display_list,
x1, y1, x2, y2);
}
static void
cogl_pango_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
double y1,
double x11,
double x21,
double y2,
double x12,
double x22)
{
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
g_return_if_fail (priv->display_list != NULL);
cogl_pango_renderer_set_color_for_part (renderer, part);
_cogl_pango_display_list_add_trapezoid (priv->display_list,
y1,
x11,
x21,
y2,
x12,
x22);
}
static void
cogl_pango_renderer_draw_glyphs (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int xi,
int yi)
{
CoglPangoRenderer *priv = (CoglPangoRenderer *) renderer;
CoglPangoGlyphCacheValue *cache_value;
int i;
for (i = 0; i < glyphs->num_glyphs; i++)
{
PangoGlyphInfo *gi = glyphs->glyphs + i;
float x, y;
cogl_pango_renderer_set_color_for_part (renderer,
PANGO_RENDER_PART_FOREGROUND);
cogl_pango_renderer_get_device_units (renderer,
xi + gi->geometry.x_offset,
yi + gi->geometry.y_offset,
&x, &y);
if ((gi->glyph & PANGO_GLYPH_UNKNOWN_FLAG))
{
if (font == NULL)
{
cogl_pango_renderer_draw_box (renderer,
x,
y,
PANGO_UNKNOWN_GLYPH_WIDTH,
PANGO_UNKNOWN_GLYPH_HEIGHT);
}
else
{
PangoRectangle ink_rect;
pango_font_get_glyph_extents (font, gi->glyph, &ink_rect, NULL);
pango_extents_to_pixels (&ink_rect, NULL);
cogl_pango_renderer_draw_box (renderer,
x + ink_rect.x,
y + ink_rect.y + ink_rect.height,
ink_rect.width,
ink_rect.height);
}
}
else
{
/* Get the texture containing the glyph */
cache_value =
cogl_pango_renderer_get_cached_glyph (renderer,
FALSE,
font,
gi->glyph);
/* cogl_pango_ensure_glyph_cache_for_layout should always be
called before rendering a layout so we should never have
a dirty glyph here */
g_assert (cache_value == NULL || !cache_value->dirty);
if (cache_value == NULL)
{
cogl_pango_renderer_draw_box (renderer,
x,
y,
PANGO_UNKNOWN_GLYPH_WIDTH,
PANGO_UNKNOWN_GLYPH_HEIGHT);
}
else if (cache_value->texture)
{
x += (float)(cache_value->draw_x);
y += (float)(cache_value->draw_y);
/* Do not override color if the glyph/font provide its own */
if (cache_value->has_color)
{
CoglColor color;
uint16_t alpha;
alpha = pango_renderer_get_alpha (renderer,
PANGO_RENDER_PART_FOREGROUND);
cogl_color_init_from_4ub (&color, 0xff, 0xff, 0xff, alpha >> 8);
_cogl_pango_display_list_set_color_override (priv->display_list, &color);
}
cogl_pango_renderer_draw_glyph (priv, cache_value, x, y);
}
}
xi += gi->geometry.width;
}
}
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