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mutter/clutter/pango/pangoclutter-render.c
Emmanuele Bassi 454e493197 Fix various compiler warnings 
Most of these fixes are simple symbol shadowing issues, like index and the
braindead y0 and y1 extern symbols exported by math.h on GNU libc systems.

There is a masking issue in ClutterTexture which should be checked; I ran
the tests and everything looked fine.

The rest are just unused variables.
2007-07-26 11:04:04 +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.h"
/*
* Texture cache support code
*/
#define TC_WIDTH 256
#define TC_HEIGHT 256
#define TC_ROUND 4
typedef struct {
guint name;
int x, y, w, h;
} tc_area;
typedef struct tc_texture {
struct tc_texture *next;
guint name;
int avail;
} tc_texture;
typedef struct tc_slice {
guint name;
int avail, y;
} tc_slice;
static int tc_generation;
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].name = 0;
while (first_texture)
{
tc_texture *next = first_texture->next;
cogl_textures_destroy (1, &first_texture->name);
g_slice_free (tc_texture, first_texture);
first_texture = next;
}
printf("freeing textures\n");
++tc_generation;
}
static void
tc_get (tc_area *area, int width, int height)
{
int slice_height = MIN (height + TC_ROUND - 1, TC_HEIGHT) & ~(TC_ROUND - 1);
tc_slice *slice = slices + slice_height / TC_ROUND;
area->w = width;
area->h = height;
width = MIN (width, TC_WIDTH);
if (!slice->name || 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, g_message ("creating new texture %i x %i\n",
TC_WIDTH, TC_HEIGHT));
match = g_slice_new (tc_texture);
match->next = first_texture;
first_texture = match;
match->avail = TC_HEIGHT;
cogl_textures_create (1, &match->name);
cogl_texture_bind (CGL_TEXTURE_2D, match->name);
cogl_texture_set_filters (CGL_TEXTURE_2D, CGL_NEAREST, CGL_NEAREST);
cogl_texture_image_2d (CGL_TEXTURE_2D,
CGL_ALPHA,
TC_WIDTH,
TC_HEIGHT,
CGL_ALPHA,
CGL_UNSIGNED_BYTE,
NULL);
}
match->avail -= slice_height;
slice->name = match->name;
slice->avail = TC_WIDTH;
slice->y = match->avail;
}
slice->avail -= width;
area->name = slice->name;
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;
guint curtex; /* current texture */
};
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;
free (buffer);
alloc = size;
buffer = 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 x,
double y)
{
PangoClutterRenderer *renderer = PANGO_CLUTTER_RENDERER (renderer_);
glyph_info *g;
struct { float x1, y1, x2, y2; } box;
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 (g)
g->generation = tc_generation;
else
{
g = g_slice_new (glyph_info);
_pango_clutter_font_set_glyph_cache_destroy
(font, (GDestroyNotify)free_glyph_info);
_pango_clutter_font_set_cache_glyph_data (font, glyph, g);
}
/*
if (renderer->curtex)
glEnd ();
*/
tc_get (&g->tex, bm.width, bm.height);
g->left = bm.left;
g->top = bm.top;
CLUTTER_NOTE (PANGO, g_message ("cache fail; subimage2d %i\n", glyph));
cogl_texture_bind (CGL_TEXTURE_2D, g->tex.name);
cogl_texture_set_alignment (CGL_TEXTURE_2D, 1, bm.stride);
cogl_texture_sub_image_2d (CGL_TEXTURE_2D,
g->tex.x,
g->tex.y,
bm.width,
bm.height,
CGL_ALPHA,
CGL_UNSIGNED_BYTE,
bm.bitmap);
renderer->curtex = g->tex.name;
/* glBegin (GL_QUADS); */
}
else CLUTTER_NOTE (PANGO, g_message ("cache succsess %i\n", glyph));
x += g->left;
y -= g->top;
box.x1 = g->tex.x * (1. / TC_WIDTH );
box.y1 = g->tex.y * (1. / TC_HEIGHT);
box.x2 = g->tex.w * (1. / TC_WIDTH ) + box.x1;
box.y2 = g->tex.h * (1. / TC_HEIGHT) + box.y1;
if (g->tex.name != renderer->curtex)
{
/*
if (renderer->curtex)
glEnd ();
*/
cogl_texture_bind (CGL_TEXTURE_2D, g->tex.name);
renderer->curtex = g->tex.name;
/* glBegin (GL_QUADS); */
}
cogl_texture_quad (x,
x + g->tex.w,
y,
y + g->tex.h,
CLUTTER_FLOAT_TO_FIXED (box.x1),
CLUTTER_FLOAT_TO_FIXED (box.y1),
CLUTTER_FLOAT_TO_FIXED (box.x2),
CLUTTER_FLOAT_TO_FIXED (box.y2));
}
static void
draw_trapezoid (PangoRenderer *renderer_,
PangoRenderPart part,
double y01,
double x11,
double x21,
double y02,
double x12,
double x22)
{
PangoClutterRenderer *renderer = (PangoClutterRenderer *)renderer_;
if (renderer->curtex)
{
/* glEnd (); */
renderer->curtex = 0;
}
/* Turn texturing off */
cogl_enable (CGL_ENABLE_BLEND);
cogl_trapezoid ((gint) y01,
(gint) x11,
(gint) x21,
(gint) y02,
(gint) x12,
(gint) x22);
/* Turn it back on again */
cogl_enable (CGL_ENABLE_TEXTURE_2D|CGL_ENABLE_BLEND);
}
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_)
{
PangoClutterRenderer *renderer = (PangoClutterRenderer *)renderer_;
renderer->curtex = 0;
cogl_enable (CGL_ENABLE_TEXTURE_2D
|CGL_ENABLE_BLEND);
#if 0
gl_BlendFuncSeparate (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
GL_ONE , GL_ONE_MINUS_SRC_ALPHA);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable (GL_ALPHA_TEST);
glAlphaFunc (GL_GREATER, 0.01f);
#endif
}
static void
draw_end (PangoRenderer *renderer_)
{
/*
PangoClutterRenderer *renderer = (PangoClutterRenderer *)renderer_;
if (renderer->curtex)
glEnd ();
*/
}
static void
pango_clutter_renderer_class_init (PangoClutterRendererClass *klass)
{
PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
renderer_class->draw_glyph = draw_glyph;
renderer_class->draw_trapezoid = draw_trapezoid;
renderer_class->prepare_run = prepare_run;
renderer_class->begin = draw_begin;
renderer_class->end = draw_end;
}
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