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mutter/cogl/cogl-path.c
Robert Bragg 3979de6982 cogl: remove _cogl_material_flush_gl_state flush options 
Since cogl_material_copy should now be cheap to use we can simplify
how we handle fallbacks and wrap mode overrides etc by simply copying
the original material and making our override changes on the new
material. This avoids the need for a sideband state structure that has
been growing in size and makes flushing material state more complex.

Note the plan is to eventually use weak materials for these override
materials and attach these as private data to the original materials so
we aren't making so many one-shot materials.
2010-06-15 15:26:27 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009,2010 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-object.h"
#include "cogl-internal.h"
#include "cogl-context.h"
#include "cogl-journal-private.h"
#include "cogl-material-private.h"
#include "cogl-framebuffer-private.h"
#include "cogl-path-private.h"
#include <string.h>
#include <math.h>
#define _COGL_MAX_BEZ_RECURSE_DEPTH 16
#ifdef HAVE_COGL_GL
#define glClientActiveTexture ctx->drv.pf_glClientActiveTexture
#endif
static void _cogl_path_free (CoglPath *path);
COGL_OBJECT_DEFINE (Path, path);
static void
_cogl_path_data_unref (CoglPathData *data)
{
if (--data->ref_count <= 0)
{
g_array_free (data->path_nodes, TRUE);
g_slice_free (CoglPathData, data);
}
}
static void
_cogl_path_modify (CoglPath *path)
{
/* This needs to be called whenever the path is about to be modified
to implement copy-on-write semantics */
/* If there is more than one path using the data then we need to
copy the data instead */
if (path->data->ref_count != 1)
{
CoglPathData *old_data = path->data;
path->data = g_slice_dup (CoglPathData, old_data);
path->data->path_nodes = g_array_new (FALSE, FALSE,
sizeof (CoglPathNode));
g_array_append_vals (path->data->path_nodes,
old_data->path_nodes->data,
old_data->path_nodes->len);
path->data->ref_count = 1;
_cogl_path_data_unref (old_data);
}
}
static void
_cogl_path_add_node (gboolean new_sub_path,
float x,
float y)
{
CoglPathNode new_node;
CoglPath *path;
CoglPathData *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
path = COGL_PATH (ctx->current_path);
_cogl_path_modify (path);
data = path->data;
new_node.x = x;
new_node.y = y;
new_node.path_size = 0;
if (new_sub_path || data->path_nodes->len == 0)
data->last_path = data->path_nodes->len;
g_array_append_val (data->path_nodes, new_node);
g_array_index (data->path_nodes, CoglPathNode, data->last_path).path_size++;
if (data->path_nodes->len == 1)
{
data->path_nodes_min.x = data->path_nodes_max.x = x;
data->path_nodes_min.y = data->path_nodes_max.y = y;
}
else
{
if (x < data->path_nodes_min.x) data->path_nodes_min.x = x;
if (x > data->path_nodes_max.x) data->path_nodes_max.x = x;
if (y < data->path_nodes_min.y) data->path_nodes_min.y = y;
if (y > data->path_nodes_max.y) data->path_nodes_max.y = y;
}
}
static void
_cogl_path_stroke_nodes (void)
{
unsigned int path_start = 0;
unsigned long enable_flags = COGL_ENABLE_VERTEX_ARRAY;
CoglPathData *data;
CoglHandle source;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
data = COGL_PATH (ctx->current_path)->data;
_cogl_journal_flush ();
/* NB: _cogl_framebuffer_flush_state may disrupt various state (such
* as the material state) when flushing the clip stack, so should
* always be done first when preparing to draw. */
_cogl_framebuffer_flush_state (_cogl_get_framebuffer (), 0);
_cogl_enable (enable_flags);
if (G_UNLIKELY (ctx->legacy_state_set))
{
source = cogl_material_copy (ctx->source_material);
_cogl_material_apply_legacy_state (source);
}
else
source = ctx->source_material;
if (cogl_material_get_n_layers (source) != 0)
{
CoglMaterialFlushOptions options;
options.flags = COGL_MATERIAL_FLUSH_DISABLE_MASK;
/* disable all texture layers */
options.disable_layers = (guint32)~0;
/* If we haven't already created a derived material... */
if (source == ctx->source_material)
source = cogl_material_copy (ctx->source_material);
_cogl_material_apply_overrides (source, &options);
}
_cogl_material_flush_gl_state (source, FALSE);
while (path_start < data->path_nodes->len)
{
CoglPathNode *node = &g_array_index (data->path_nodes, CoglPathNode,
path_start);
GE( glVertexPointer (2, GL_FLOAT, sizeof (CoglPathNode), &node->x) );
GE( glDrawArrays (GL_LINE_STRIP, 0, node->path_size) );
path_start += node->path_size;
}
if (G_UNLIKELY (source != ctx->source_material))
cogl_handle_unref (source);
}
void
_cogl_path_get_bounds (CoglPath *path,
float *min_x,
float *min_y,
float *max_x,
float *max_y)
{
CoglPathData *data = path->data;
if (data->path_nodes->len == 0)
{
*min_x = 0.0f;
*min_y = 0.0f;
*max_x = 0.0f;
*max_y = 0.0f;
}
else
{
*min_x = data->path_nodes_min.x;
*min_y = data->path_nodes_min.y;
*max_x = data->path_nodes_max.x;
*max_y = data->path_nodes_max.y;
}
}
void
_cogl_add_path_to_stencil_buffer (CoglPath *path,
gboolean merge,
gboolean need_clear)
{
CoglPathData *data = path->data;
unsigned int path_start = 0;
unsigned long enable_flags = COGL_ENABLE_VERTEX_ARRAY;
CoglHandle prev_source;
CoglFramebuffer *framebuffer = _cogl_get_framebuffer ();
CoglMatrixStack *modelview_stack =
_cogl_framebuffer_get_modelview_stack (framebuffer);
CoglMatrixStack *projection_stack =
_cogl_framebuffer_get_projection_stack (framebuffer);
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* We don't track changes to the stencil buffer in the journal
* so we need to flush any batched geometry first */
_cogl_journal_flush ();
/* NB: _cogl_framebuffer_flush_state may disrupt various state (such
* as the material state) when flushing the clip stack, so should
* always be done first when preparing to draw. */
_cogl_framebuffer_flush_state (framebuffer, 0);
/* Just setup a simple material that doesn't use texturing... */
prev_source = cogl_object_ref (ctx->source_material);
cogl_set_source (ctx->stencil_material);
_cogl_material_flush_gl_state (ctx->source_material, FALSE);
_cogl_enable (enable_flags);
GE( glEnable (GL_STENCIL_TEST) );
GE( glColorMask (FALSE, FALSE, FALSE, FALSE) );
GE( glDepthMask (FALSE) );
if (merge)
{
GE (glStencilMask (2));
GE (glStencilFunc (GL_LEQUAL, 0x2, 0x6));
}
else
{
/* If we're not using the stencil buffer for clipping then we
don't need to clear the whole stencil buffer, just the area
that will be drawn */
if (need_clear)
/* If this is being called from the clip stack code then it
will have set up a scissor for the minimum bounding box of
all of the clips. That box will likely mean that this
cogl_clear won't need to clear the entire buffer */
cogl_clear (NULL, COGL_BUFFER_BIT_STENCIL);
else
{
/* Just clear the bounding box */
GE( glStencilMask (~(GLuint) 0) );
GE( glStencilOp (GL_ZERO, GL_ZERO, GL_ZERO) );
cogl_rectangle (data->path_nodes_min.x,
data->path_nodes_min.y,
data->path_nodes_max.x,
data->path_nodes_max.y);
/* Make sure the rectangle hits the stencil buffer before
* directly changing other GL state. */
_cogl_journal_flush ();
/* NB: The journal flushing may trash the modelview state and
* enable flags */
_cogl_matrix_stack_flush_to_gl (modelview_stack,
COGL_MATRIX_MODELVIEW);
_cogl_enable (enable_flags);
}
GE (glStencilMask (1));
GE (glStencilFunc (GL_LEQUAL, 0x1, 0x3));
}
GE (glStencilOp (GL_INVERT, GL_INVERT, GL_INVERT));
/* Disable all client texture coordinate arrays */
_cogl_bitmask_clear_all (&ctx->temp_bitmask);
_cogl_disable_other_texcoord_arrays (&ctx->temp_bitmask);
while (path_start < data->path_nodes->len)
{
CoglPathNode *node =
&g_array_index (data->path_nodes, CoglPathNode, path_start);
GE (glVertexPointer (2, GL_FLOAT, sizeof (CoglPathNode), &node->x));
GE (glDrawArrays (GL_TRIANGLE_FAN, 0, node->path_size));
path_start += node->path_size;
}
if (merge)
{
/* Now we have the new stencil buffer in bit 1 and the old
stencil buffer in bit 0 so we need to intersect them */
GE (glStencilMask (3));
GE (glStencilFunc (GL_NEVER, 0x2, 0x3));
GE (glStencilOp (GL_DECR, GL_DECR, GL_DECR));
/* Decrement all of the bits twice so that only pixels where the
value is 3 will remain */
_cogl_matrix_stack_push (projection_stack);
_cogl_matrix_stack_load_identity (projection_stack);
_cogl_matrix_stack_flush_to_gl (projection_stack,
COGL_MATRIX_PROJECTION);
_cogl_matrix_stack_push (modelview_stack);
_cogl_matrix_stack_load_identity (modelview_stack);
_cogl_matrix_stack_flush_to_gl (modelview_stack,
COGL_MATRIX_MODELVIEW);
cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
/* Make sure these rectangles hit the stencil buffer before we
* restore the stencil op/func. */
_cogl_journal_flush ();
_cogl_matrix_stack_pop (modelview_stack);
_cogl_matrix_stack_pop (projection_stack);
}
GE (glStencilMask (~(GLuint) 0));
GE (glDepthMask (TRUE));
GE (glColorMask (TRUE, TRUE, TRUE, TRUE));
GE (glStencilFunc (GL_EQUAL, 0x1, 0x1));
GE (glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP));
/* restore the original material */
cogl_set_source (prev_source);
cogl_object_unref (prev_source);
}
static int
compare_ints (gconstpointer a,
gconstpointer b)
{
return GPOINTER_TO_INT(a)-GPOINTER_TO_INT(b);
}
static void
_cogl_path_fill_nodes_scanlines (CoglPathNode *path,
unsigned int path_size,
int bounds_x,
int bounds_y,
unsigned int bounds_w,
unsigned int bounds_h)
{
CoglHandle source;
/* This is our edge list it stores intersections between our
* curve and scanlines, it should probably be implemented with a
* data structure that has smaller overhead for inserting the
* curve/scanline intersections.
*/
GSList **scanlines = g_alloca (bounds_h * sizeof (GSList *));
int i;
int prev_x;
int prev_y;
int first_x;
int first_y;
int lastdir = -2; /* last direction we vere moving */
int lastline = -1; /* the previous scanline we added to */
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* We are going to use GL to draw directly so make sure any
* previously batched geometry gets to GL before we start...
*/
_cogl_journal_flush ();
/* NB: _cogl_framebuffer_flush_state may disrupt various state (such
* as the material state) when flushing the clip stack, so should
* always be done first when preparing to draw. */
_cogl_framebuffer_flush_state (_cogl_get_framebuffer (), 0);
if (G_UNLIKELY (ctx->legacy_state_set))
{
source = cogl_material_copy (ctx->source_material);
_cogl_material_apply_legacy_state (source);
}
else
source = ctx->source_material;
_cogl_material_flush_gl_state (source, FALSE);
_cogl_enable (COGL_ENABLE_VERTEX_ARRAY);
/* clear scanline intersection lists */
for (i = 0; i < bounds_h; i++)
scanlines[i]=NULL;
first_x = prev_x = path->x;
first_y = prev_y = path->y;
/* create scanline intersection list */
for (i=1; i < path_size; i++)
{
int dest_x = path[i].x;
int dest_y = path[i].y;
int ydir;
int dx;
int dy;
int y;
fill_close:
dx = dest_x - prev_x;
dy = dest_y - prev_y;
if (dy < 0)
ydir = -1;
else if (dy > 0)
ydir = 1;
else
ydir = 0;
/* do linear interpolation between vertices */
for (y = prev_y; y != dest_y; y += ydir)
{
/* only add a point if the scanline has changed and we're
* within bounds.
*/
if (y - bounds_y >= 0 &&
y - bounds_y < bounds_h &&
lastline != y)
{
int x = prev_x + (dx * (y-prev_y)) / dy;
scanlines[ y - bounds_y ]=
g_slist_insert_sorted (scanlines[ y - bounds_y],
GINT_TO_POINTER(x),
compare_ints);
if (ydir != lastdir && /* add a double entry when changing */
lastdir != -2) /* vertical direction */
scanlines[ y - bounds_y ]=
g_slist_insert_sorted (scanlines[ y - bounds_y],
GINT_TO_POINTER(x),
compare_ints);
lastdir = ydir;
lastline = y;
}
}
prev_x = dest_x;
prev_y = dest_y;
/* if we're on the last knot, fake the first vertex being a
next one */
if (path_size == i+1)
{
dest_x = first_x;
dest_y = first_y;
i++; /* to make the loop finally end */
goto fill_close;
}
}
{
int spans = 0;
int span_no;
GLfloat *coords;
/* count number of spans */
for (i = 0; i < bounds_h; i++)
{
GSList *iter = scanlines[i];
while (iter)
{
GSList *next = iter->next;
if (!next)
{
break;
}
/* draw the segments that should be visible */
spans ++;
iter = next->next;
}
}
coords = g_malloc0 (spans * sizeof (GLfloat) * 3 * 2 * 2);
span_no = 0;
/* build list of triangles */
for (i = 0; i < bounds_h; i++)
{
GSList *iter = scanlines[i];
while (iter)
{
GSList *next = iter->next;
GLfloat x_0, x_1;
GLfloat y_0, y_1;
if (!next)
break;
x_0 = GPOINTER_TO_INT (iter->data);
x_1 = GPOINTER_TO_INT (next->data);
y_0 = bounds_y + i;
y_1 = bounds_y + i + 1.0625f;
/* render scanlines 1.0625 high to avoid gaps when
transformed */
coords[span_no * 12 + 0] = x_0;
coords[span_no * 12 + 1] = y_0;
coords[span_no * 12 + 2] = x_1;
coords[span_no * 12 + 3] = y_0;
coords[span_no * 12 + 4] = x_1;
coords[span_no * 12 + 5] = y_1;
coords[span_no * 12 + 6] = x_0;
coords[span_no * 12 + 7] = y_0;
coords[span_no * 12 + 8] = x_0;
coords[span_no * 12 + 9] = y_1;
coords[span_no * 12 + 10] = x_1;
coords[span_no * 12 + 11] = y_1;
span_no ++;
iter = next->next;
}
}
for (i = 0; i < bounds_h; i++)
g_slist_free (scanlines[i]);
/* render triangles */
GE (glVertexPointer (2, GL_FLOAT, 0, coords ));
GE (glDrawArrays (GL_TRIANGLES, 0, spans * 2 * 3));
g_free (coords);
}
if (G_UNLIKELY (source != ctx->source_material))
cogl_handle_unref (source);
}
static void
_cogl_path_fill_nodes (void)
{
CoglPathData *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
data = COGL_PATH (ctx->current_path)->data;
if (G_LIKELY (!(cogl_debug_flags & COGL_DEBUG_FORCE_SCANLINE_PATHS)) &&
cogl_features_available (COGL_FEATURE_STENCIL_BUFFER))
{
CoglFramebuffer *framebuffer;
CoglClipState *clip_state;
_cogl_journal_flush ();
framebuffer = _cogl_get_framebuffer ();
clip_state = _cogl_framebuffer_get_clip_state (framebuffer);
_cogl_add_path_to_stencil_buffer (ctx->current_path,
clip_state->stencil_used,
FALSE);
cogl_rectangle (data->path_nodes_min.x,
data->path_nodes_min.y,
data->path_nodes_max.x,
data->path_nodes_max.y);
/* The stencil buffer now contains garbage so the clip area needs to
* be rebuilt.
*
* NB: We only ever try and update the clip state during
* _cogl_journal_init (when we flush the framebuffer state) which is
* only called when the journal first gets something logged in it; so
* we call cogl_flush() to emtpy the journal.
*/
cogl_flush ();
_cogl_clip_state_dirty (clip_state);
}
else
{
unsigned int path_start = 0;
while (path_start < data->path_nodes->len)
{
CoglPathNode *node = &g_array_index (data->path_nodes, CoglPathNode,
path_start);
_cogl_path_fill_nodes_scanlines (node, node->path_size,
data->path_nodes_min.x,
data->path_nodes_min.y,
data->path_nodes_max.x -
data->path_nodes_min.x,
data->path_nodes_max.y -
data->path_nodes_min.y);
path_start += node->path_size;
}
}
}
void
cogl_path_fill (void)
{
cogl_path_fill_preserve ();
cogl_path_new ();
}
void
cogl_path_fill_preserve (void)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (COGL_PATH (ctx->current_path)->data->path_nodes->len == 0)
return;
_cogl_path_fill_nodes ();
}
void
cogl_path_stroke (void)
{
cogl_path_stroke_preserve ();
cogl_path_new ();
}
void
cogl_path_stroke_preserve (void)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (COGL_PATH (ctx->current_path)->data->path_nodes->len == 0)
return;
_cogl_path_stroke_nodes ();
}
void
cogl_path_move_to (float x,
float y)
{
CoglPathData *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_path_add_node (TRUE, x, y);
data = COGL_PATH (ctx->current_path)->data;
data->path_start.x = x;
data->path_start.y = y;
data->path_pen = data->path_start;
}
void
cogl_path_rel_move_to (float x,
float y)
{
CoglPathData *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
data = COGL_PATH (ctx->current_path)->data;
cogl_path_move_to (data->path_pen.x + x,
data->path_pen.y + y);
}
void
cogl_path_line_to (float x,
float y)
{
CoglPathData *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_path_add_node (FALSE, x, y);
data = COGL_PATH (ctx->current_path)->data;
data->path_pen.x = x;
data->path_pen.y = y;
}
void
cogl_path_rel_line_to (float x,
float y)
{
CoglPathData *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
data = COGL_PATH (ctx->current_path)->data;
cogl_path_line_to (data->path_pen.x + x,
data->path_pen.y + y);
}
void
cogl_path_close (void)
{
CoglPath *path;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
path = COGL_PATH (ctx->current_path);
_cogl_path_add_node (FALSE, path->data->path_start.x,
path->data->path_start.y);
path->data->path_pen = path->data->path_start;
}
void
cogl_path_new (void)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
cogl_object_unref (ctx->current_path);
ctx->current_path = _cogl_path_new ();
}
void
cogl_path_line (float x_1,
float y_1,
float x_2,
float y_2)
{
cogl_path_move_to (x_1, y_1);
cogl_path_line_to (x_2, y_2);
}
void
cogl_path_polyline (float *coords,
int num_points)
{
int c = 0;
cogl_path_move_to (coords[0], coords[1]);
for (c = 1; c < num_points; ++c)
cogl_path_line_to (coords[2*c], coords[2*c+1]);
}
void
cogl_path_polygon (float *coords,
int num_points)
{
cogl_path_polyline (coords, num_points);
cogl_path_close ();
}
void
cogl_path_rectangle (float x_1,
float y_1,
float x_2,
float y_2)
{
cogl_path_move_to (x_1, y_1);
cogl_path_line_to (x_2, y_1);
cogl_path_line_to (x_2, y_2);
cogl_path_line_to (x_1, y_2);
cogl_path_close ();
}
static void
_cogl_path_arc (float center_x,
float center_y,
float radius_x,
float radius_y,
float angle_1,
float angle_2,
float angle_step,
unsigned int move_first)
{
float a = 0x0;
float cosa = 0x0;
float sina = 0x0;
float px = 0x0;
float py = 0x0;
/* Fix invalid angles */
if (angle_1 == angle_2 || angle_step == 0x0)
return;
if (angle_step < 0x0)
angle_step = -angle_step;
/* Walk the arc by given step */
a = angle_1;
while (a != angle_2)
{
cosa = cosf (a * (G_PI/180.0));
sina = sinf (a * (G_PI/180.0));
px = center_x + (cosa * radius_x);
py = center_y + (sina * radius_y);
if (a == angle_1 && move_first)
cogl_path_move_to (px, py);
else
cogl_path_line_to (px, py);
if (G_LIKELY (angle_2 > angle_1))
{
a += angle_step;
if (a > angle_2)
a = angle_2;
}
else
{
a -= angle_step;
if (a < angle_2)
a = angle_2;
}
}
/* Make sure the final point is drawn */
cosa = cosf (angle_2 * (G_PI/180.0));
sina = sinf (angle_2 * (G_PI/180.0));
px = center_x + (cosa * radius_x);
py = center_y + (sina * radius_y);
cogl_path_line_to (px, py);
}
void
cogl_path_arc (float center_x,
float center_y,
float radius_x,
float radius_y,
float angle_1,
float angle_2)
{
float angle_step = 10;
/* it is documented that a move to is needed to create a freestanding
* arc
*/
_cogl_path_arc (center_x, center_y,
radius_x, radius_y,
angle_1, angle_2,
angle_step, 0 /* no move */);
}
static void
_cogl_path_rel_arc (float center_x,
float center_y,
float radius_x,
float radius_y,
float angle_1,
float angle_2,
float angle_step)
{
CoglPathData *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
data = COGL_PATH (ctx->current_path)->data;
_cogl_path_arc (data->path_pen.x + center_x,
data->path_pen.y + center_y,
radius_x, radius_y,
angle_1, angle_2,
angle_step, 0 /* no move */);
}
void
cogl_path_ellipse (float center_x,
float center_y,
float radius_x,
float radius_y)
{
float angle_step = 10;
/* FIXME: if shows to be slow might be optimized
* by mirroring just a quarter of it */
_cogl_path_arc (center_x, center_y,
radius_x, radius_y,
0, 360,
angle_step, 1 /* move first */);
cogl_path_close();
}
void
cogl_path_round_rectangle (float x_1,
float y_1,
float x_2,
float y_2,
float radius,
float arc_step)
{
CoglPath *path;
float inner_width = x_2 - x_1 - radius * 2;
float inner_height = y_2 - y_1 - radius * 2;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
path = COGL_PATH (ctx->current_path);
cogl_path_move_to (x_1, y_1 + radius);
_cogl_path_rel_arc (radius, 0,
radius, radius,
180,
270,
arc_step);
cogl_path_line_to (path->data->path_pen.x + inner_width,
path->data->path_pen.y);
_cogl_path_rel_arc (0, radius,
radius, radius,
-90,
0,
arc_step);
cogl_path_line_to (path->data->path_pen.x,
path->data->path_pen.y + inner_height);
_cogl_path_rel_arc (-radius, 0,
radius, radius,
0,
90,
arc_step);
cogl_path_line_to (path->data->path_pen.x - inner_width,
path->data->path_pen.y);
_cogl_path_rel_arc (0, -radius,
radius, radius,
90,
180,
arc_step);
cogl_path_close ();
}
static void
_cogl_path_bezier3_sub (CoglBezCubic *cubic)
{
CoglBezCubic cubics[_COGL_MAX_BEZ_RECURSE_DEPTH];
CoglBezCubic *cleft;
CoglBezCubic *cright;
CoglBezCubic *c;
floatVec2 dif1;
floatVec2 dif2;
floatVec2 mm;
floatVec2 c1;
floatVec2 c2;
floatVec2 c3;
floatVec2 c4;
floatVec2 c5;
int cindex;
/* Put first curve on stack */
cubics[0] = *cubic;
cindex = 0;
while (cindex >= 0)
{
c = &cubics[cindex];
/* Calculate distance of control points from their
* counterparts on the line between end points */
dif1.x = (c->p2.x * 3) - (c->p1.x * 2) - c->p4.x;
dif1.y = (c->p2.y * 3) - (c->p1.y * 2) - c->p4.y;
dif2.x = (c->p3.x * 3) - (c->p4.x * 2) - c->p1.x;
dif2.y = (c->p3.y * 3) - (c->p4.y * 2) - c->p1.y;
if (dif1.x < 0)
dif1.x = -dif1.x;
if (dif1.y < 0)
dif1.y = -dif1.y;
if (dif2.x < 0)
dif2.x = -dif2.x;
if (dif2.y < 0)
dif2.y = -dif2.y;
/* Pick the greatest of two distances */
if (dif1.x < dif2.x) dif1.x = dif2.x;
if (dif1.y < dif2.y) dif1.y = dif2.y;
/* Cancel if the curve is flat enough */
if (dif1.x + dif1.y <= 1.0 ||
cindex == _COGL_MAX_BEZ_RECURSE_DEPTH-1)
{
/* Add subdivision point (skip last) */
if (cindex == 0)
return;
_cogl_path_add_node (FALSE, c->p4.x, c->p4.y);
--cindex;
continue;
}
/* Left recursion goes on top of stack! */
cright = c; cleft = &cubics[++cindex];
/* Subdivide into 2 sub-curves */
c1.x = ((c->p1.x + c->p2.x) / 2);
c1.y = ((c->p1.y + c->p2.y) / 2);
mm.x = ((c->p2.x + c->p3.x) / 2);
mm.y = ((c->p2.y + c->p3.y) / 2);
c5.x = ((c->p3.x + c->p4.x) / 2);
c5.y = ((c->p3.y + c->p4.y) / 2);
c2.x = ((c1.x + mm.x) / 2);
c2.y = ((c1.y + mm.y) / 2);
c4.x = ((mm.x + c5.x) / 2);
c4.y = ((mm.y + c5.y) / 2);
c3.x = ((c2.x + c4.x) / 2);
c3.y = ((c2.y + c4.y) / 2);
/* Add left recursion to stack */
cleft->p1 = c->p1;
cleft->p2 = c1;
cleft->p3 = c2;
cleft->p4 = c3;
/* Add right recursion to stack */
cright->p1 = c3;
cright->p2 = c4;
cright->p3 = c5;
cright->p4 = c->p4;
}
}
void
cogl_path_curve_to (float x_1,
float y_1,
float x_2,
float y_2,
float x_3,
float y_3)
{
CoglBezCubic cubic;
CoglPath *path;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
path = COGL_PATH (ctx->current_path);
/* Prepare cubic curve */
cubic.p1 = path->data->path_pen;
cubic.p2.x = x_1;
cubic.p2.y = y_1;
cubic.p3.x = x_2;
cubic.p3.y = y_2;
cubic.p4.x = x_3;
cubic.p4.y = y_3;
/* Run subdivision */
_cogl_path_bezier3_sub (&cubic);
/* Add last point */
_cogl_path_add_node (FALSE, cubic.p4.x, cubic.p4.y);
path->data->path_pen = cubic.p4;
}
void
cogl_path_rel_curve_to (float x_1,
float y_1,
float x_2,
float y_2,
float x_3,
float y_3)
{
CoglPathData *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
data = COGL_PATH (ctx->current_path)->data;
cogl_path_curve_to (data->path_pen.x + x_1,
data->path_pen.y + y_1,
data->path_pen.x + x_2,
data->path_pen.y + y_2,
data->path_pen.x + x_3,
data->path_pen.y + y_3);
}
CoglPath *
_cogl_path_new (void)
{
CoglPath *path;
CoglPathData *data;
path = g_slice_new (CoglPath);
data = path->data = g_slice_new (CoglPathData);
data->ref_count = 1;
data->path_nodes = g_array_new (FALSE, FALSE, sizeof (CoglPathNode));
data->last_path = 0;
return _cogl_path_object_new (path);
}
CoglPath *
cogl_path_copy (CoglPath *old_path)
{
CoglPath *new_path;
_COGL_GET_CONTEXT (ctx, NULL);
if (!cogl_is_path (old_path))
return NULL;
new_path = g_slice_new (CoglPath);
new_path->data = old_path->data;
new_path->data->ref_count++;
return _cogl_path_object_new (new_path);
}
static void
_cogl_path_free (CoglPath *path)
{
_cogl_path_data_unref (path->data);
g_slice_free (CoglPath, path);
}
/* If second order beziers were needed the following code could
* be re-enabled:
*/
#if 0
static void
_cogl_path_bezier2_sub (CoglBezQuad *quad)
{
CoglBezQuad quads[_COGL_MAX_BEZ_RECURSE_DEPTH];
CoglBezQuad *qleft;
CoglBezQuad *qright;
CoglBezQuad *q;
floatVec2 mid;
floatVec2 dif;
floatVec2 c1;
floatVec2 c2;
floatVec2 c3;
int qindex;
/* Put first curve on stack */
quads[0] = *quad;
qindex = 0;
/* While stack is not empty */
while (qindex >= 0)
{
q = &quads[qindex];
/* Calculate distance of control point from its
* counterpart on the line between end points */
mid.x = ((q->p1.x + q->p3.x) / 2);
mid.y = ((q->p1.y + q->p3.y) / 2);
dif.x = (q->p2.x - mid.x);
dif.y = (q->p2.y - mid.y);
if (dif.x < 0) dif.x = -dif.x;
if (dif.y < 0) dif.y = -dif.y;
/* Cancel if the curve is flat enough */
if (dif.x + dif.y <= 1.0 ||
qindex == _COGL_MAX_BEZ_RECURSE_DEPTH - 1)
{
/* Add subdivision point (skip last) */
if (qindex == 0) return;
_cogl_path_add_node (FALSE, q->p3.x, q->p3.y);
--qindex; continue;
}
/* Left recursion goes on top of stack! */
qright = q; qleft = &quads[++qindex];
/* Subdivide into 2 sub-curves */
c1.x = ((q->p1.x + q->p2.x) / 2);
c1.y = ((q->p1.y + q->p2.y) / 2);
c3.x = ((q->p2.x + q->p3.x) / 2);
c3.y = ((q->p2.y + q->p3.y) / 2);
c2.x = ((c1.x + c3.x) / 2);
c2.y = ((c1.y + c3.y) / 2);
/* Add left recursion onto stack */
qleft->p1 = q->p1;
qleft->p2 = c1;
qleft->p3 = c2;
/* Add right recursion onto stack */
qright->p1 = c2;
qright->p2 = c3;
qright->p3 = q->p3;
}
}
void
cogl_path_curve2_to (float x_1,
float y_1,
float x_2,
float y_2)
{
CoglPath *path;
CoglBezQuad quad;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
path = COGL_PATH (ctx->current_path);
/* Prepare quadratic curve */
quad.p1 = path->data->path_pen;
quad.p2.x = x_1;
quad.p2.y = y_1;
quad.p3.x = x_2;
quad.p3.y = y_2;
/* Run subdivision */
_cogl_path_bezier2_sub (&quad);
/* Add last point */
_cogl_path_add_node (FALSE, quad.p3.x, quad.p3.y);
path->data->path_pen = quad.p3;
}
void
cogl_rel_curve2_to (float x_1,
float y_1,
float x_2,
float y_2)
{
CoglPathData *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
data = COGL_PATH (ctx->current_path)->data;
cogl_path_curve2_to (data->path_pen.x + x_1,
data->path_pen.y + y_1,
data->path_pen.x + x_2,
data->path_pen.y + y_2);
}
#endif
CoglPath *
cogl_get_path (void)
{
_COGL_GET_CONTEXT (ctx, NULL);
return ctx->current_path;
}
void
cogl_set_path (CoglPath *path)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (!cogl_is_path (path))
return;
/* Reference the new object first in case it is the same as the old
object */
cogl_object_ref (path);
cogl_object_unref (ctx->current_path);
ctx->current_path = path;
}
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