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mutter/clutter/pango/pangoclutter-render.c
Ivan Leben ef084cfa95 * clutter/cogl/cogl.h.in: 
* clutter/cogl/gl(es)/cogl-texture.h:
	* clutter/cogl/gl(es)/cogl-texture.c:
	cogl_texture_new_* functions take a gboolean auto_mipmap argument.
	If TRUE automatic mipmap generation is enabled during the process
	of slice texture object creation.
	(cogl_texture_new_from_foreign:) now allows mipmap min filter
	flags.

	* clutter/clutter-texture.c:
	* clutter/glx/clutter-glx-texture-pixmap.c:
	* tests/test-cogl-offscreen.c:
	* tests/test-cogl-tex-tile.c:
	* tests/test-cogl-tex-convert.c:
	* tests/test-cogl-tex-polygon.c:
	* tests/test-cogl-tex-getset.c:
	Pass FALSE for auto_mipmap to cogl_texture_new_*.

	* clutter/pango/pangoclutter-render.c:
	(tc_get:) Pass TRUE to cogl_texture_new_with_size and use mipmap
	min filter for nicer glyphs at small scales. As a result test-text
	has gone all beautiful now.
2008-05-07 16:12:54 +00:00

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/* Pango
* Rendering routines to Clutter
*
* Copyright (C) 2006 Matthew Allum <mallum@o-hand.com>
* Copyright (C) 2006 Marc Lehmann <pcg@goof.com>
* Copyright (C) 2004 Red Hat Software
* Copyright (C) 2000 Tor Lillqvist
*
* This file is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include "pangoclutter.h"
#include "pangoclutter-private.h"
#include "../clutter-debug.h"
#include "cogl/cogl.h"
/*
* Texture cache support code
*/
#define TC_WIDTH 256
#define TC_HEIGHT 256
#define TC_ROUND 4
typedef struct {
CoglHandle cogl_tex;
int x, y, w, h;
} tc_area;
typedef struct tc_texture {
struct tc_texture *next;
CoglHandle cogl_tex;
int avail;
} tc_texture;
typedef struct tc_slice {
CoglHandle cogl_tex;
int avail, y;
} tc_slice;
static int tc_generation = 0;
static tc_slice slices[TC_HEIGHT / TC_ROUND];
static tc_texture *first_texture;
static void
tc_clear ()
{
int i;
for (i = TC_HEIGHT / TC_ROUND; i--; )
slices [i].cogl_tex = COGL_INVALID_HANDLE;
while (first_texture)
{
tc_texture *next = first_texture->next;
cogl_texture_unref (first_texture->cogl_tex);
g_slice_free (tc_texture, first_texture);
first_texture = next;
}
++tc_generation;
}
static void
tc_get (tc_area *area, int width, int height)
{
int slice_height;
tc_slice *slice;
area->w = width;
area->h = height;
/* Provide for blank rows/columns of pixels between adjecant glyphs in the
* texture cache to avoid bilinear interpolation spillage at edges of glyphs.
*/
width += 1;
height += 1;
slice_height = MIN (height + TC_ROUND - 1, TC_HEIGHT) & ~(TC_ROUND - 1);
slice = slices + slice_height / TC_ROUND;
width = MIN (width, TC_WIDTH);
if (slice->cogl_tex == COGL_INVALID_HANDLE || slice->avail < width)
{
/* try to find a texture with enough space */
tc_texture *tex, *match = 0;
for (tex = first_texture; tex; tex = tex->next)
if (tex->avail >= slice_height && (!match || match->avail > tex->avail))
match = tex;
/* create a new texture if necessary */
if (!match)
{
CLUTTER_NOTE (PANGO, "creating new texture %i x %i",
TC_WIDTH, TC_HEIGHT);
match = g_slice_new (tc_texture);
match->next = first_texture;
first_texture = match;
match->avail = TC_HEIGHT;
match->cogl_tex = cogl_texture_new_with_size (TC_WIDTH, TC_HEIGHT, 0, TRUE,
COGL_PIXEL_FORMAT_A_8);
/* We use mipmapping instead of just CGL_LINEAR here
* which allows rendering of glyphs to look nice even at
* scales far below 50%.
*/
cogl_texture_set_filters (match->cogl_tex,
CGL_LINEAR_MIPMAP_LINEAR,
CGL_LINEAR);
}
match->avail -= slice_height;
slice->cogl_tex = match->cogl_tex;
slice->avail = TC_WIDTH;
slice->y = match->avail;
}
slice->avail -= width;
area->cogl_tex = slice->cogl_tex;
area->x = slice->avail;
area->y = slice->y;
}
static void
tc_put (tc_area *area)
{
/* our management is too primitive to support this operation yet */
}
/*******************/
#define PANGO_CLUTTER_RENDERER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), \
PANGO_TYPE_CLUTTER_RENDERER, \
PangoClutterRendererClass))
#define PANGO_IS_CLUTTER_RENDERER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_CLUTTER_RENDERER))
#define PANGO_CLUTTER_RENDERER_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS ((obj), \
PANGO_TYPE_CLUTTER_RENDERER, \
PangoClutterRendererClass))
typedef struct {
PangoRendererClass parent_class;
} PangoClutterRendererClass;
struct _PangoClutterRenderer
{
PangoRenderer parent_instance;
ClutterColor color;
int flags;
};
G_DEFINE_TYPE (PangoClutterRenderer, \
pango_clutter_renderer, \
PANGO_TYPE_RENDERER)
typedef struct
{
guint8 *bitmap;
int width, stride, height, top, left;
} Glyph;
static void *
temp_buffer (size_t size)
{
static char *buffer;
static size_t alloc;
if (size > alloc)
{
size = (size + 4095) & ~4095;
g_free (buffer);
alloc = size;
buffer = g_malloc (size);
}
return buffer;
}
static void
render_box (Glyph *glyph, int width, int height, int top)
{
int i;
int left = 0;
if (height > 2)
{
height -= 2;
top++;
}
if (width > 2)
{
width -= 2;
left++;
}
glyph->stride = (width + 3) & ~3;
glyph->width = width;
glyph->height = height;
glyph->top = top;
glyph->left = left;
glyph->bitmap = temp_buffer (width * height);
memset (glyph->bitmap, 0, glyph->stride * height);
for (i = width; i--; )
glyph->bitmap [i]
= glyph->bitmap [i + (height - 1) * glyph->stride] = 0xff;
for (i = height; i--; )
glyph->bitmap [i * glyph->stride]
= glyph->bitmap [i * glyph->stride + (width - 1)] = 0xff;
}
static void
font_render_glyph (Glyph *glyph, PangoFont *font, int glyph_index)
{
FT_Face face;
if (glyph_index & PANGO_GLYPH_UNKNOWN_FLAG)
{
PangoFontMetrics *metrics;
if (!font)
goto generic_box;
metrics = pango_font_get_metrics (font, NULL);
if (!metrics)
goto generic_box;
render_box (glyph, PANGO_PIXELS (metrics->approximate_char_width),
PANGO_PIXELS (metrics->ascent + metrics->descent),
PANGO_PIXELS (metrics->ascent));
pango_font_metrics_unref (metrics);
return;
}
face = pango_clutter_font_get_face (font);
if (face)
{
PangoClutterFont *glfont = (PangoClutterFont *)font;
FT_Load_Glyph (face, glyph_index, glfont->load_flags);
FT_Render_Glyph (face->glyph, ft_render_mode_normal);
glyph->width = face->glyph->bitmap.width;
glyph->stride = face->glyph->bitmap.pitch;
glyph->height = face->glyph->bitmap.rows;
glyph->top = face->glyph->bitmap_top;
glyph->left = face->glyph->bitmap_left;
glyph->bitmap = face->glyph->bitmap.buffer;
}
else
generic_box:
render_box (glyph, PANGO_UNKNOWN_GLYPH_WIDTH,
PANGO_UNKNOWN_GLYPH_HEIGHT, PANGO_UNKNOWN_GLYPH_HEIGHT);
}
typedef struct glyph_info
{
tc_area tex;
int left, top;
int generation;
}
glyph_info;
static void
free_glyph_info (glyph_info *g)
{
tc_put (&g->tex);
g_slice_free (glyph_info, g);
}
static void
draw_glyph (PangoRenderer *renderer_,
PangoFont *font,
PangoGlyph glyph,
double xd,
double yd)
{
glyph_info *g;
gint x = (gint)xd, y = (gint)yd;
ClutterFixed fx, fy;
if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
{
glyph = pango_clutter_get_unknown_glyph (font);
if (glyph == PANGO_GLYPH_EMPTY)
glyph = PANGO_GLYPH_UNKNOWN_FLAG;
}
g = _pango_clutter_font_get_cache_glyph_data (font, glyph);
if (!g || g->generation != tc_generation)
{
Glyph bm;
font_render_glyph (&bm, font, glyph);
if (bm.width < 1 || bm.height < 1 || bm.bitmap == NULL)
{
/* Safety on */
if (g)
{
x += g->left;
y -= g->top;
}
return;
}
if (bm.height > TC_HEIGHT)
{
g_warning ("%s: Glyph too large for cache, increase TC_HEIGHT",
G_STRLOC);
}
if (g)
g->generation = tc_generation;
else
{
g = g_slice_new0 (glyph_info);
_pango_clutter_font_set_glyph_cache_destroy
(font, (GDestroyNotify)free_glyph_info);
_pango_clutter_font_set_cache_glyph_data (font, glyph, g);
}
tc_get (&g->tex, bm.width, bm.height);
g->left = bm.left;
g->top = bm.top;
CLUTTER_NOTE (PANGO, "cache fail; subimage2d %i", glyph);
cogl_texture_set_region (g->tex.cogl_tex,
0, 0,
g->tex.x, g->tex.y,
bm.width, bm.height,
bm.width, bm.height,
COGL_PIXEL_FORMAT_A_8,
bm.stride,
bm.bitmap);
}
else
CLUTTER_NOTE (PANGO, "cache success %i\n", glyph);
x += g->left;
y -= g->top;
fx = CLUTTER_INT_TO_FIXED (g->tex.x) / TC_WIDTH;
fy = CLUTTER_INT_TO_FIXED (g->tex.y) / TC_HEIGHT;
cogl_texture_rectangle (g->tex.cogl_tex,
CLUTTER_INT_TO_FIXED (x),
CLUTTER_INT_TO_FIXED (y),
CLUTTER_INT_TO_FIXED (x + g->tex.w),
CLUTTER_INT_TO_FIXED (y + g->tex.h),
fx, fy,
CLUTTER_INT_TO_FIXED (g->tex.w) / TC_WIDTH + fx,
CLUTTER_INT_TO_FIXED (g->tex.h) / TC_WIDTH + fy);
}
void
pango_clutter_render_layout_subpixel (PangoLayout *layout,
int x,
int y,
ClutterColor *color,
int flags)
{
PangoContext *context;
PangoFontMap *fontmap;
PangoRenderer *renderer;
context = pango_layout_get_context (layout);
fontmap = pango_context_get_font_map (context);
renderer = _pango_clutter_font_map_get_renderer
(PANGO_CLUTTER_FONT_MAP (fontmap));
memcpy (&(PANGO_CLUTTER_RENDERER (renderer)->color),
color, sizeof(ClutterColor));
pango_renderer_draw_layout (renderer, layout, x, y);
}
void
pango_clutter_render_layout (PangoLayout *layout,
int x,
int y,
ClutterColor *color,
int flags)
{
pango_clutter_render_layout_subpixel (layout,
x * PANGO_SCALE,
y * PANGO_SCALE,
color,
flags);
}
void
pango_clutter_render_layout_line (PangoLayoutLine *line,
int x,
int y,
ClutterColor *color)
{
PangoContext *context;
PangoFontMap *fontmap;
PangoRenderer *renderer;
context = pango_layout_get_context (line->layout);
fontmap = pango_context_get_font_map (context);
renderer = _pango_clutter_font_map_get_renderer
(PANGO_CLUTTER_FONT_MAP (fontmap));
memcpy (&(PANGO_CLUTTER_RENDERER (renderer)->color),
color, sizeof(ClutterColor));
pango_renderer_draw_layout_line (renderer, line, x, y);
}
void
pango_clutter_render_clear_caches (void)
{
tc_clear();
}
static void
pango_clutter_renderer_init (PangoClutterRenderer *renderer)
{
memset (&renderer->color, 0xff, sizeof(ClutterColor));
}
static void
prepare_run (PangoRenderer *renderer, PangoLayoutRun *run)
{
PangoClutterRenderer *glrenderer = (PangoClutterRenderer *)renderer;
PangoColor *fg = 0;
GSList *l;
ClutterColor col;
renderer->underline = PANGO_UNDERLINE_NONE;
renderer->strikethrough = FALSE;
for (l = run->item->analysis.extra_attrs; l; l = l->next)
{
PangoAttribute *attr = l->data;
switch (attr->klass->type)
{
case PANGO_ATTR_UNDERLINE:
renderer->underline = ((PangoAttrInt *)attr)->value;
break;
case PANGO_ATTR_STRIKETHROUGH:
renderer->strikethrough = ((PangoAttrInt *)attr)->value;
break;
case PANGO_ATTR_FOREGROUND:
fg = &((PangoAttrColor *)attr)->color;
break;
default:
break;
}
}
if (fg)
{
col.red = (fg->red * 255) / 65535;
col.green = (fg->green * 255) / 65535;
col.blue = (fg->blue * 255) / 65535;
}
else
{
col.red = glrenderer->color.red;
col.green = glrenderer->color.green;
col.blue = glrenderer->color.blue;
}
col.alpha = glrenderer->color.alpha;
if (glrenderer->flags & FLAG_INVERSE)
{
col.red ^= 0xffU;
col.green ^= 0xffU;
col.blue ^= 0xffU;
}
cogl_color(&col);
}
static void
draw_begin (PangoRenderer *renderer_)
{
}
static void
draw_end (PangoRenderer *renderer_)
{
}
static void
pango_clutter_renderer_class_init (PangoClutterRendererClass *klass)
{
PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
renderer_class->draw_glyph = draw_glyph;
renderer_class->prepare_run = prepare_run;
renderer_class->begin = draw_begin;
renderer_class->end = draw_end;
}
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