+++ /dev/null
-/**************************************************************************
- *
- * Copyright 2009 VMware, Inc. All Rights Reserved.
- *
- * 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, sub license, 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 (including the
- * next paragraph) 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 NON-INFRINGEMENT.
- * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
- *
- **************************************************************************/
-
-#include "stroker.h"
-
-#include "path.h"
-#include "vg_state.h"
-#include "util_array.h"
-#include "arc.h"
-#include "bezier.h"
-#include "matrix.h"
-#include "path_utils.h"
-#include "polygon.h"
-
-#include "util/u_math.h"
-
-#ifndef M_2PI
-#define M_2PI 6.28318530717958647692528676655900576
-#endif
-
-#define STROKE_SEGMENTS 0
-#define STROKE_DEBUG 0
-#define DEBUG_EMITS 0
-
-static const VGfloat curve_threshold = 0.25f;
-
-static const VGfloat zero_coords[] = {0.f, 0.f};
-
-enum intersection_type {
- NoIntersections,
- BoundedIntersection,
- UnboundedIntersection,
-};
-
-enum line_join_mode {
- FlatJoin,
- SquareJoin,
- MiterJoin,
- RoundJoin,
- RoundCap
-};
-
-struct stroke_iterator {
- void (*next)(struct stroke_iterator *);
- VGboolean (*has_next)(struct stroke_iterator *);
-
- VGPathCommand (*current_command)(struct stroke_iterator *it);
- void (*current_coords)(struct stroke_iterator *it, VGfloat *coords);
-
- VGint position;
- VGint coord_position;
-
- const VGubyte *cmds;
- const VGfloat *coords;
- VGint num_commands;
- VGint num_coords;
-
- struct polygon *curve_poly;
- VGint curve_index;
-};
-
-static VGPathCommand stroke_itr_command(struct stroke_iterator *itr)
-{
- return itr->current_command(itr);
-}
-
-static void stroke_itr_coords(struct stroke_iterator *itr, VGfloat *coords)
-{
- itr->current_coords(itr, coords);
-}
-
-static void stroke_fw_itr_coords(struct stroke_iterator *itr, VGfloat *coords)
-{
- if (itr->position >= itr->num_commands)
- return;
- switch (stroke_itr_command(itr)) {
- case VG_MOVE_TO_ABS:
- coords[0] = itr->coords[itr->coord_position];
- coords[1] = itr->coords[itr->coord_position + 1];
- break;
- case VG_LINE_TO_ABS:
- coords[0] = itr->coords[itr->coord_position];
- coords[1] = itr->coords[itr->coord_position + 1];
- break;
- case VG_CUBIC_TO_ABS:
- coords[0] = itr->coords[itr->coord_position];
- coords[1] = itr->coords[itr->coord_position + 1];
- coords[2] = itr->coords[itr->coord_position + 2];
- coords[3] = itr->coords[itr->coord_position + 3];
- coords[4] = itr->coords[itr->coord_position + 4];
- coords[5] = itr->coords[itr->coord_position + 5];
- break;
- default:
- debug_assert(!"invalid command!\n");
- }
-}
-
-
-static void stroke_bw_itr_coords(struct stroke_iterator *itr, VGfloat *coords)
-{
- if (itr->position >= itr->num_commands)
- return;
- switch (stroke_itr_command(itr)) {
- case VG_MOVE_TO_ABS:
- coords[0] = itr->coords[itr->coord_position];
- coords[1] = itr->coords[itr->coord_position + 1];
- break;
- case VG_LINE_TO_ABS:
- coords[0] = itr->coords[itr->coord_position];
- coords[1] = itr->coords[itr->coord_position + 1];
- break;
- case VG_CUBIC_TO_ABS:
- coords[0] = itr->coords[itr->coord_position + 4];
- coords[1] = itr->coords[itr->coord_position + 5];
- coords[2] = itr->coords[itr->coord_position + 2];
- coords[3] = itr->coords[itr->coord_position + 3];
- coords[4] = itr->coords[itr->coord_position + 0];
- coords[5] = itr->coords[itr->coord_position + 1];
- break;
- default:
- debug_assert(!"invalid command!\n");
- }
-}
-
-
-static VGPathCommand stroke_fw_current_command(struct stroke_iterator *it)
-{
- return it->cmds[it->position];
-}
-
-static VGPathCommand stroke_bw_current_command(struct stroke_iterator *it)
-{
- VGPathCommand prev_cmd;
- if (it->position == it->num_commands -1)
- return VG_MOVE_TO_ABS;
-
- prev_cmd = it->cmds[it->position + 1];
- return prev_cmd;
-}
-
-static VGboolean stroke_fw_has_next(struct stroke_iterator *itr)
-{
- return itr->position < (itr->num_commands - 1);
-}
-
-static VGboolean stroke_bw_has_next(struct stroke_iterator *itr)
-{
- return itr->position > 0;
-}
-
-static void stroke_fw_next(struct stroke_iterator *itr)
-{
- VGubyte cmd;
- debug_assert(stroke_fw_has_next(itr));
-
- cmd = stroke_itr_command(itr);
-
- itr->coord_position += num_elements_for_segments(&cmd, 1);
- ++itr->position;
-}
-
-static void stroke_bw_next(struct stroke_iterator *itr)
-{
- VGubyte cmd;
- debug_assert(stroke_bw_has_next(itr));
-
- --itr->position;
- cmd = stroke_itr_command(itr);
-
- itr->coord_position -= num_elements_for_segments(&cmd, 1);
-}
-
-static void stroke_itr_common_init(struct stroke_iterator *itr,
- struct array *cmds,
- struct array *coords)
-{
- itr->cmds = (VGubyte*)cmds->data;
- itr->num_commands = cmds->num_elements;
-
- itr->coords = (VGfloat*)coords->data;
- itr->num_coords = coords->num_elements;
-}
-
-static void stroke_forward_iterator(struct stroke_iterator *itr,
- struct array *cmds,
- struct array *coords)
-{
- stroke_itr_common_init(itr, cmds, coords);
- itr->position = 0;
- itr->coord_position = 0;
-
- itr->next = stroke_fw_next;
- itr->has_next = stroke_fw_has_next;
- itr->current_command = stroke_fw_current_command;
- itr->current_coords = stroke_fw_itr_coords;
-}
-
-static void stroke_backward_iterator(struct stroke_iterator *itr,
- struct array *cmds,
- struct array *coords)
-{
- VGubyte cmd;
- stroke_itr_common_init(itr, cmds, coords);
- itr->position = itr->num_commands - 1;
-
- cmd = stroke_bw_current_command(itr);
- itr->coord_position = itr->num_coords -
- num_elements_for_segments(&cmd, 1);
-
- itr->next = stroke_bw_next;
- itr->has_next = stroke_bw_has_next;
- itr->current_command = stroke_bw_current_command;
- itr->current_coords = stroke_bw_itr_coords;
-}
-
-
-
-static void stroke_flat_next(struct stroke_iterator *itr)
-{
- VGubyte cmd;
-
- if (itr->curve_index >= 0) {
- ++itr->curve_index;
- if (itr->curve_index >= polygon_vertex_count(itr->curve_poly)) {
- itr->curve_index = -1;
- polygon_destroy(itr->curve_poly);
- itr->curve_poly = 0;
- } else
- return;
- }
- debug_assert(stroke_fw_has_next(itr));
-
- cmd = itr->cmds[itr->position];
- itr->coord_position += num_elements_for_segments(&cmd, 1);
- ++itr->position;
-
- cmd = itr->cmds[itr->position];
-
- if (cmd == VG_CUBIC_TO_ABS) {
- struct bezier bezier;
- VGfloat bez[8];
-
- bez[0] = itr->coords[itr->coord_position - 2];
- bez[1] = itr->coords[itr->coord_position - 1];
- bez[2] = itr->coords[itr->coord_position];
- bez[3] = itr->coords[itr->coord_position + 1];
- bez[4] = itr->coords[itr->coord_position + 2];
- bez[5] = itr->coords[itr->coord_position + 3];
- bez[6] = itr->coords[itr->coord_position + 4];
- bez[7] = itr->coords[itr->coord_position + 5];
-
- bezier_init(&bezier,
- bez[0], bez[1],
- bez[2], bez[3],
- bez[4], bez[5],
- bez[6], bez[7]);
- /* skip the first one, it's the same as the prev point */
- itr->curve_index = 1;
- if (itr->curve_poly) {
- polygon_destroy(itr->curve_poly);
- itr->curve_poly = 0;
- }
- itr->curve_poly = bezier_to_polygon(&bezier);
- }
-}
-
-static VGboolean stroke_flat_has_next(struct stroke_iterator *itr)
-{
- return (itr->curve_index >= 0 &&
- itr->curve_index < (polygon_vertex_count(itr->curve_poly)-1))
- || itr->position < (itr->num_commands - 1);
-}
-
-static VGPathCommand stroke_flat_current_command(struct stroke_iterator *it)
-{
- if (it->cmds[it->position] == VG_CUBIC_TO_ABS) {
- return VG_LINE_TO_ABS;
- }
- return it->cmds[it->position];
-}
-
-static void stroke_flat_itr_coords(struct stroke_iterator *itr, VGfloat *coords)
-{
- if (itr->curve_index <= -1 && itr->position >= itr->num_commands)
- return;
-
- if (itr->curve_index >= 0) {
- polygon_vertex(itr->curve_poly, itr->curve_index,
- coords);
- return;
- }
-
- switch (stroke_itr_command(itr)) {
- case VG_MOVE_TO_ABS:
- coords[0] = itr->coords[itr->coord_position];
- coords[1] = itr->coords[itr->coord_position + 1];
- break;
- case VG_LINE_TO_ABS:
- coords[0] = itr->coords[itr->coord_position];
- coords[1] = itr->coords[itr->coord_position + 1];
- break;
- case VG_CUBIC_TO_ABS:
- default:
- debug_assert(!"invalid command!\n");
- }
-}
-
-static void stroke_flat_iterator(struct stroke_iterator *itr,
- struct array *cmds,
- struct array *coords)
-{
- stroke_itr_common_init(itr, cmds, coords);
- itr->position = 0;
- itr->coord_position = 0;
-
- itr->next = stroke_flat_next;
- itr->has_next = stroke_flat_has_next;
- itr->current_command = stroke_flat_current_command;
- itr->current_coords = stroke_flat_itr_coords;
- itr->curve_index = -1;
- itr->curve_poly = 0;
-}
-
-
-static INLINE VGboolean finite_coords4(const VGfloat *c)
-{
- return
- isfinite(c[0]) && isfinite(c[1]) &&
- isfinite(c[2]) && isfinite(c[3]);
-}
-
-/* from Graphics Gems II */
-#define SAME_SIGNS(a, b) ((a) * (b) >= 0)
-static VGboolean do_lines_intersect(VGfloat x1, VGfloat y1, VGfloat x2, VGfloat y2,
- VGfloat x3, VGfloat y3, VGfloat x4, VGfloat y4)
-{
- VGfloat a1, a2, b1, b2, c1, c2; /* Coefficients of line eqns */
- VGfloat r1, r2, r3, r4; /* 'sign' values */
-
- a1 = y2 - y1;
- b1 = x1 - x2;
- c1 = x2 * y1 - x1 * y2;
-
- r3 = a1 * x3 + b1 * y3 + c1;
- r4 = a1 * x4 + b1 * y4 + c1;
-
- if (r3 != 0 && r4 != 0 && SAME_SIGNS(r3, r4))
- return VG_FALSE;
-
- a2 = y4 - y3;
- b2 = x3 - x4;
- c2 = x4 * y3 - x3 * y4;
-
- r1 = a2 * x1 + b2 * y1 + c2;
- r2 = a2 * x2 + b2 * y2 + c2;
-
- if (r1 != 0 && r2 != 0 && SAME_SIGNS(r1, r2))
- return VG_FALSE;
-
- return VG_TRUE;
-}
-
-static INLINE VGfloat line_dx(const VGfloat *l)
-{
- return l[2] - l[0];
-}
-
-static INLINE VGfloat line_dy(const VGfloat *l)
-{
- return l[3] - l[1];
-}
-
-static INLINE VGfloat line_angle(const VGfloat *l)
-{
- const VGfloat dx = line_dx(l);
- const VGfloat dy = line_dy(l);
-
- const VGfloat theta = atan2(-dy, dx) * 360.0 / M_2PI;
-
- const VGfloat theta_normalized = theta < 0 ? theta + 360 : theta;
-
- if (floatsEqual(theta_normalized, 360.f))
- return 0;
- else
- return theta_normalized;
-}
-
-static INLINE void line_set_length(VGfloat *l, VGfloat len)
-{
- VGfloat uv[] = {l[0], l[1], l[2], l[3]};
- if (null_line(l))
- return;
- line_normalize(uv);
- l[2] = l[0] + line_dx(uv) * len;
- l[3] = l[1] + line_dy(uv) * len;
-}
-
-static INLINE void line_translate(VGfloat *l, VGfloat x, VGfloat y)
-{
- l[0] += x;
- l[1] += y;
- l[2] += x;
- l[3] += y;
-}
-
-static INLINE VGfloat line_angle_to(const VGfloat *l1,
- const VGfloat *l2)
-{
- VGfloat a1, a2, delta, delta_normalized;
- if (null_line(l1) || null_line(l1))
- return 0;
-
- a1 = line_angle(l1);
- a2 = line_angle(l2);
-
- delta = a2 - a1;
- delta_normalized = delta < 0 ? delta + 360 : delta;
-
- if (floatsEqual(delta, 360.f))
- return 0;
- else
- return delta_normalized;
-}
-
-static INLINE VGfloat line_angles(const VGfloat *l1,
- const VGfloat *l2)
-{
- VGfloat cos_line, rad = 0;
-
- if (null_line(l1) || null_line(l2))
- return 0;
-
- cos_line = (line_dx(l1)*line_dx(l2) + line_dy(l1)*line_dy(l2)) /
- (line_lengthv(l1)*line_lengthv(l2));
- rad = 0;
-
- if (cos_line >= -1.0 && cos_line <= 1.0)
- rad = acos(cos_line);
- return rad * 360 / M_2PI;
-}
-
-
-static INLINE VGfloat adapted_angle_on_x(const VGfloat *line)
-{
- const VGfloat identity[] = {0, 0, 1, 0};
- VGfloat angle = line_angles(line, identity);
- if (line_dy(line) > 0)
- angle = 360 - angle;
- return angle;
-}
-
-static enum intersection_type line_intersect(const VGfloat *l1,
- const VGfloat *l2,
- float *intersection_point)
-{
- VGfloat isect[2] = { 0 };
- enum intersection_type type;
- VGboolean dx_zero, ldx_zero;
-
- if (null_line(l1) || null_line(l2) ||
- !finite_coords4(l1) || !finite_coords4(l2))
- return NoIntersections;
-
- type = do_lines_intersect(l1[0], l1[1], l1[2], l1[3], l2[0], l2[1], l2[2], l2[3])
- ? BoundedIntersection : UnboundedIntersection;
-
- dx_zero = floatsEqual(line_dx(l1) + 1, 1);
- ldx_zero = floatsEqual(line_dx(l2) + 1, 1);
-
- /* one of the lines is vertical */
- if (dx_zero && ldx_zero) {
- type = NoIntersections;
- } else if (dx_zero) {
- VGfloat la = line_dy(l2) / line_dx(l2);
- isect[0] = l1[0];
- isect[1] = la * l1[0] + l2[1] - la * l2[0];
- } else if (ldx_zero) {
- VGfloat ta = line_dy(l1) / line_dx(l1);
- isect[0] = l2[0];
- isect[1] = ta * l2[0] + l1[1] - ta*l1[0];
- } else {
- VGfloat x;
- VGfloat ta = line_dy(l1) / line_dx(l1);
- VGfloat la = line_dy(l2) / line_dx(l2);
- if (ta == la)
- return NoIntersections;
-
- x = ( - l2[1] + la * l2[0] + l1[1] - ta * l1[0] ) / (la - ta);
- isect[0] = x;
- isect[1] = ta*(x - l1[0]) + l1[1];
- }
- if (intersection_point) {
- intersection_point[0] = isect[0];
- intersection_point[1] = isect[1];
- }
- return type;
-}
-
-static INLINE enum line_join_mode stroker_join_mode(struct stroker *s)
-{
- switch(s->join_style) {
- case VG_JOIN_MITER:
- return MiterJoin;
- case VG_JOIN_ROUND:
- return RoundJoin;
- case VG_JOIN_BEVEL:
- return FlatJoin;
- default:
- return FlatJoin;
- }
-}
-
-static INLINE enum line_join_mode stroker_cap_mode(struct stroker *s)
-{
- switch(s->cap_style) {
- case VG_CAP_BUTT:
- return FlatJoin;
- case VG_CAP_ROUND:
- return RoundCap;
- case VG_CAP_SQUARE:
- return SquareJoin;
- default:
- return FlatJoin;
- }
-}
-
-void stroker_emit_move_to(struct stroker *stroker, VGfloat x, VGfloat y)
-{
- VGubyte cmds = VG_MOVE_TO_ABS;
- VGfloat coords[2] = {x, y};
-#if DEBUG_EMITS
- debug_printf("emit move %f, %f\n", x, y);
-#endif
- stroker->back2_x = stroker->back1_x;
- stroker->back2_y = stroker->back1_y;
- stroker->back1_x = x;
- stroker->back1_y = y;
-
- path_append_data(stroker->path,
- 1,
- &cmds, &coords);
-}
-
-void stroker_emit_line_to(struct stroker *stroker, VGfloat x, VGfloat y)
-{
- VGubyte cmds = VG_LINE_TO_ABS;
- VGfloat coords[2] = {x, y};
-#if DEBUG_EMITS
- debug_printf("emit line %f, %f\n", x, y);
-#endif
- stroker->back2_x = stroker->back1_x;
- stroker->back2_y = stroker->back1_y;
- stroker->back1_x = x;
- stroker->back1_y = y;
- path_append_data(stroker->path,
- 1,
- &cmds, &coords);
-}
-
-void stroker_emit_curve_to(struct stroker *stroker, VGfloat px1, VGfloat py1,
- VGfloat px2, VGfloat py2,
- VGfloat x, VGfloat y)
-{
- VGubyte cmds = VG_CUBIC_TO_ABS;
- VGfloat coords[6] = {px1, py1, px2, py2, x, y};
-#if DEBUG_EMITS
- debug_printf("emit curve %f, %f, %f, %f, %f, %f\n", px1, py1,
- px2, py2, x, y);
-#endif
-
- if (px2 == x && py2 == y) {
- if (px1 == x && py1 == y) {
- stroker->back2_x = stroker->back1_x;
- stroker->back2_y = stroker->back1_y;
- } else {
- stroker->back2_x = px1;
- stroker->back2_y = py1;
- }
- } else {
- stroker->back2_x = px2;
- stroker->back2_y = py2;
- }
- stroker->back1_x = x;
- stroker->back1_y = y;
-
- path_append_data(stroker->path,
- 1,
- &cmds, &coords);
-}
-
-static INLINE void create_round_join(struct stroker *stroker,
- VGfloat x1, VGfloat y1,
- VGfloat x2, VGfloat y2,
- VGfloat width, VGfloat height)
-{
- struct arc arc;
- struct matrix matrix;
-
- matrix_load_identity(&matrix);
-
- /*stroker_emit_line_to(stroker, nx, ny);*/
-
- arc_init(&arc, VG_SCCWARC_TO,
- x1, y1, x2, y2, width/2, height/2, 0);
- arc_stroker_emit(&arc, stroker, &matrix);
-}
-
-
-static void create_joins(struct stroker *stroker,
- VGfloat focal_x, VGfloat focal_y,
- const VGfloat *next_line, enum line_join_mode join)
-{
-#if DEBUG_EMITS
- debug_printf("create_joins: focal=[%f, %f], next_line=[%f, %f,%f, %f]\n",
- focal_x, focal_y,
- next_line[0], next_line[1], next_line[2], next_line[3]);
-#endif
- /* if we're alredy connected do nothing */
- if (floatsEqual(stroker->back1_x, next_line[0]) &&
- floatsEqual(stroker->back1_y, next_line[1]))
- return;
-
- if (join == FlatJoin) {
- stroker_emit_line_to(stroker, next_line[0], next_line[1]);
- } else {
- VGfloat prev_line[] = {stroker->back2_x, stroker->back2_y,
- stroker->back1_x, stroker->back1_y};
-
- VGfloat isect[2] = { 0 };
- enum intersection_type type = line_intersect(prev_line, next_line, isect);
-
- if (join == SquareJoin) {
- VGfloat offset = stroker->stroke_width / 2;
- VGfloat l1[4] = {prev_line[0],
- prev_line[1],
- prev_line[2],
- prev_line[3]};
- VGfloat l2[4] = {next_line[2],
- next_line[3],
- next_line[0],
- next_line[1]};
-
- line_translate(l1, line_dx(l1), line_dy(l1));
- line_set_length(l1, offset);
-
- line_translate(l2, line_dx(l2), line_dy(l2));
- line_set_length(l2, offset);
-
- stroker_emit_line_to(stroker, l1[2], l1[3]);
- stroker_emit_line_to(stroker, l2[2], l2[3]);
- stroker_emit_line_to(stroker, l2[0], l2[1]);
- } else if (join == RoundJoin) {
- VGfloat offset = stroker->stroke_width / 2;
- VGfloat short_cut[4] = {prev_line[2], prev_line[3],
- next_line[0], next_line[1]};
- VGfloat angle = line_angles(prev_line, short_cut);
-
- if (type == BoundedIntersection ||
- (angle > 90 && !floatsEqual(angle, 90.f))) {
- stroker_emit_line_to(stroker, next_line[0], next_line[1]);
- return;
- }
- create_round_join(stroker, prev_line[2], prev_line[3],
- next_line[0], next_line[1],
- offset * 2, offset * 2);
-
- stroker_emit_line_to(stroker, next_line[0], next_line[1]);
- } else if (join == RoundCap) {
- VGfloat offset = stroker->stroke_width / 2;
- VGfloat l1[4] = { prev_line[0], prev_line[1],
- prev_line[2], prev_line[3] };
- VGfloat l2[4] = {focal_x, focal_y,
- prev_line[2], prev_line[3]};
-
- line_translate(l1, line_dx(l1), line_dy(l1));
- line_set_length(l1, KAPPA * offset);
-
- /* normal between prev_line and focal */
- line_translate(l2, -line_dy(l2), line_dx(l2));
- line_set_length(l2, KAPPA * offset);
-
- stroker_emit_curve_to(stroker, l1[2], l1[3],
- l2[2], l2[3],
- l2[0], l2[1]);
-
- l2[0] = l2[0];
- l2[1] = l2[1];
- l2[2] = l2[0] - line_dx(l2);
- l2[3] = l2[1] - line_dy(l2);
-
- line_translate(l1, next_line[0] - l1[0], next_line[1] - l1[1]);
-
- stroker_emit_curve_to(stroker,
- l2[2], l2[3],
- l1[2], l1[3],
- l1[0], l1[1]);
- } else if (join == MiterJoin) {
- VGfloat miter_line[4] = {stroker->back1_x, stroker->back1_y,
- isect[0], isect[1]};
- VGfloat sl = (stroker->stroke_width * stroker->miter_limit);
- VGfloat inside_line[4] = {prev_line[2], prev_line[3],
- next_line[0], next_line[1]};
- VGfloat angle = line_angle_to(inside_line, prev_line);
-
- if (type == BoundedIntersection ||
- (angle > 90 && !floatsEqual(angle, 90.f))) {
- /*
- debug_printf("f = %f, nl = %f, pl = %f, is = %f\n",
- focal_x, next_line[0],
- prev_line[2], isect[0]);*/
- stroker_emit_line_to(stroker, next_line[0], next_line[1]);
- return;
- }
-
- if (type == NoIntersections || line_lengthv(miter_line) > sl) {
- stroker_emit_line_to(stroker, next_line[0], next_line[1]);
- } else {
- stroker_emit_line_to(stroker, isect[0], isect[1]);
- stroker_emit_line_to(stroker, next_line[0], next_line[1]);
- }
- } else {
- debug_assert(!"create_joins bad join style");
- }
- }
-}
-
-static void stroker_add_segment(struct stroker *stroker,
- VGPathCommand cmd,
- const VGfloat *coords,
- VGint num_coords)
-{
- /* skip duplicated points */
- if (stroker->segments->num_elements &&
- stroker->last_cmd == cmd) {
- VGfloat *data = stroker->control_points->data;
- data += stroker->control_points->num_elements;
- data -= num_coords;
- switch (cmd) {
- case VG_MOVE_TO_ABS:
- if (floatsEqual(coords[0], data[0]) &&
- floatsEqual(coords[1], data[1]))
- return;
- break;
- case VG_LINE_TO_ABS:
- if (floatsEqual(coords[0], data[0]) &&
- floatsEqual(coords[1], data[1]))
- return;
- break;
- case VG_CUBIC_TO_ABS:
- if (floatsEqual(coords[0], data[0]) &&
- floatsEqual(coords[1], data[1]) &&
- floatsEqual(coords[2], data[2]) &&
- floatsEqual(coords[3], data[3]) &&
- floatsEqual(coords[4], data[4]) &&
- floatsEqual(coords[5], data[5]))
- return;
- break;
- default:
- debug_assert(!"Invalid stroke segment");
- }
- } else if (stroker->last_cmd == VG_CUBIC_TO_ABS &&
- cmd == VG_LINE_TO_ABS) {
- VGfloat *data = stroker->control_points->data;
- data += stroker->control_points->num_elements;
- data -= 2;
- if (floatsEqual(coords[0], data[0]) &&
- floatsEqual(coords[1], data[1]))
- return;
- }
- stroker->last_cmd = cmd;
- array_append_data(stroker->segments, &cmd, 1);
- array_append_data(stroker->control_points, coords, num_coords);
-}
-
-void stroker_move_to(struct stroker *stroker, VGfloat x, VGfloat y)
-{
- VGfloat coords[2] = {x, y};
-#if STROKE_SEGMENTS
- debug_printf("stroker_move_to(%f, %f)\n", x, y);
-#endif
-
- if (stroker->segments->num_elements > 0)
- stroker->process_subpath(stroker);
-
- array_reset(stroker->segments);
- array_reset(stroker->control_points);
-
- stroker_add_segment(stroker, VG_MOVE_TO_ABS, coords, 2);
-}
-
-void stroker_line_to(struct stroker *stroker, VGfloat x, VGfloat y)
-{
- VGfloat coords[] = {x, y};
-
-#if STROKE_SEGMENTS
- debug_printf("stroker_line_to(%f, %f)\n", x, y);
-#endif
- if (!stroker->segments->num_elements)
- stroker_add_segment(stroker, VG_MOVE_TO_ABS, zero_coords, 2);
-
- stroker_add_segment(stroker, VG_LINE_TO_ABS, coords, 2);
-}
-
-void stroker_curve_to(struct stroker *stroker, VGfloat px1, VGfloat py1,
- VGfloat px2, VGfloat py2,
- VGfloat x, VGfloat y)
-{
- VGfloat coords[] = {px1, py1,
- px2, py2,
- x, y};
-#if STROKE_SEGMENTS
- debug_printf("stroker_curve_to(%f, %f, %f, %f, %f, %f)\n",
- px1, py1, px2, py2, x, y);
-#endif
- if (!stroker->segments->num_elements)
- stroker_add_segment(stroker, VG_MOVE_TO_ABS, zero_coords, 2);
-
- stroker_add_segment(stroker, VG_CUBIC_TO_ABS, coords, 6);
-}
-
-static INLINE VGboolean is_segment_null(VGPathCommand cmd,
- VGfloat *coords,
- VGfloat *res)
-{
- switch(cmd) {
- case VG_MOVE_TO_ABS:
- case VG_LINE_TO_ABS:
- return floatsEqual(coords[0], res[0]) &&
- floatsEqual(coords[1], res[1]);
- break;
- case VG_CUBIC_TO_ABS:
- return floatsEqual(coords[0], res[0]) &&
- floatsEqual(coords[1], res[1]) &&
- floatsEqual(coords[2], res[0]) &&
- floatsEqual(coords[3], res[1]) &&
- floatsEqual(coords[4], res[0]) &&
- floatsEqual(coords[5], res[1]);
- break;
- default:
- assert(0);
- }
- return VG_FALSE;
-}
-
-static VGboolean vg_stroke_outline(struct stroke_iterator *it,
- struct stroker *stroker,
- VGboolean cap_first,
- VGfloat *start_tangent)
-{
-#define MAX_OFFSET 16
- struct bezier offset_curves[MAX_OFFSET];
- VGPathCommand first_element;
- VGfloat start[2], prev[2];
- VGboolean first = VG_TRUE;
- VGfloat offset;
-
- first_element = stroke_itr_command(it);
- if (first_element != VG_MOVE_TO_ABS) {
- stroker_emit_move_to(stroker, 0.f, 0.f);
- prev[0] = 0.f;
- prev[1] = 0.f;
- }
- stroke_itr_coords(it, start);
-#if STROKE_DEBUG
- debug_printf(" -> (side) [%.2f, %.2f]\n",
- start[0],
- start[1]);
-#endif
-
- prev[0] = start[0];
- prev[1] = start[1];
-
- offset = stroker->stroke_width / 2;
-
- if (!it->has_next(it)) {
- /* single point */
-
- return VG_TRUE;
- }
-
- while (it->has_next(it)) {
- VGPathCommand cmd;
- VGfloat coords[8];
-
- it->next(it);
- cmd = stroke_itr_command(it);
- stroke_itr_coords(it, coords);
-
- if (cmd == VG_LINE_TO_ABS) {
- VGfloat line[4] = {prev[0], prev[1], coords[0], coords[1]};
- VGfloat normal[4];
- line_normal(line, normal);
-
-#if STROKE_DEBUG
- debug_printf("\n ---> (side) lineto [%.2f, %.2f]\n", coords[0], coords[1]);
-#endif
- line_set_length(normal, offset);
- line_translate(line, line_dx(normal), line_dy(normal));
-
- /* if we are starting a new subpath, move to correct starting point */
- if (first) {
- if (cap_first)
- create_joins(stroker, prev[0], prev[1], line,
- stroker_cap_mode(stroker));
- else
- stroker_emit_move_to(stroker, line[0], line[1]);
- memcpy(start_tangent, line,
- sizeof(VGfloat) * 4);
- first = VG_FALSE;
- } else {
- create_joins(stroker, prev[0], prev[1], line,
- stroker_join_mode(stroker));
- }
-
- /* add the stroke for this line */
- stroker_emit_line_to(stroker, line[2], line[3]);
- prev[0] = coords[0];
- prev[1] = coords[1];
- } else if (cmd == VG_CUBIC_TO_ABS) {
-#if STROKE_DEBUG
- debug_printf("\n ---> (side) cubicTo [%.2f, %.2f]\n",
- coords[4],
- coords[5]);
-#endif
- struct bezier bezier;
- int count;
-
- bezier_init(&bezier,
- prev[0], prev[1], coords[0], coords[1],
- coords[2], coords[3], coords[4], coords[5]);
-
- count = bezier_translate_by_normal(&bezier,
- offset_curves,
- MAX_OFFSET,
- offset,
- curve_threshold);
-
- if (count) {
- /* if we are starting a new subpath, move to correct starting point */
- VGfloat tangent[4];
- VGint i;
-
- bezier_start_tangent(&bezier, tangent);
- line_translate(tangent,
- offset_curves[0].x1 - bezier.x1,
- offset_curves[0].y1 - bezier.y1);
- if (first) {
- VGfloat pt[2] = {offset_curves[0].x1,
- offset_curves[0].y1};
-
- if (cap_first) {
- create_joins(stroker, prev[0], prev[1], tangent,
- stroker_cap_mode(stroker));
- } else {
- stroker_emit_move_to(stroker, pt[0], pt[1]);
- }
- start_tangent[0] = tangent[0];
- start_tangent[1] = tangent[1];
- start_tangent[2] = tangent[2];
- start_tangent[3] = tangent[3];
- first = VG_FALSE;
- } else {
- create_joins(stroker, prev[0], prev[1], tangent,
- stroker_join_mode(stroker));
- }
-
- /* add these beziers */
- for (i = 0; i < count; ++i) {
- struct bezier *bez = &offset_curves[i];
- stroker_emit_curve_to(stroker,
- bez->x2, bez->y2,
- bez->x3, bez->y3,
- bez->x4, bez->y4);
- }
- }
-
- prev[0] = coords[4];
- prev[1] = coords[5];
- }
- }
-
- if (floatsEqual(start[0], prev[0]) &&
- floatsEqual(start[1], prev[1])) {
- /* closed subpath, join first and last point */
-#if STROKE_DEBUG
- debug_printf("\n stroker: closed subpath\n");
-#endif
- create_joins(stroker, prev[0], prev[1], start_tangent,
- stroker_join_mode(stroker));
- return VG_TRUE;
- } else {
-#if STROKE_DEBUG
- debug_printf("\n stroker: open subpath\n");
-#endif
- return VG_FALSE;
- }
-#undef MAX_OFFSET
-}
-
-static void stroker_process_subpath(struct stroker *stroker)
-{
- VGboolean fwclosed, bwclosed;
- VGfloat fw_start_tangent[4], bw_start_tangent[4];
- struct stroke_iterator fwit;
- struct stroke_iterator bwit;
- debug_assert(stroker->segments->num_elements > 0);
-
- memset(fw_start_tangent, 0,
- sizeof(VGfloat)*4);
- memset(bw_start_tangent, 0,
- sizeof(VGfloat)*4);
-
- stroke_forward_iterator(&fwit, stroker->segments,
- stroker->control_points);
- stroke_backward_iterator(&bwit, stroker->segments,
- stroker->control_points);
-
- debug_assert(fwit.cmds[0] == VG_MOVE_TO_ABS);
-
- fwclosed = vg_stroke_outline(&fwit, stroker, VG_FALSE, fw_start_tangent);
- bwclosed = vg_stroke_outline(&bwit, stroker, !fwclosed, bw_start_tangent);
-
- if (!bwclosed)
- create_joins(stroker,
- fwit.coords[0], fwit.coords[1], fw_start_tangent,
- stroker_cap_mode(stroker));
- else {
- /* hack to handle the requirement of the VG spec that says that strokes
- * of len==0 that have butt cap or round cap still need
- * to be rendered. (8.7.4 Stroke Generation) */
- if (stroker->segments->num_elements <= 3) {
- VGPathCommand cmd;
- VGfloat data[8], coords[8];
- struct stroke_iterator *it = &fwit;
-
- stroke_forward_iterator(it, stroker->segments,
- stroker->control_points);
- cmd = stroke_itr_command(it);
- stroke_itr_coords(it, coords);
- if (cmd != VG_MOVE_TO_ABS) {
- memset(data, 0, sizeof(VGfloat) * 8);
- if (!is_segment_null(cmd, coords, data))
- return;
- } else {
- data[0] = coords[0];
- data[1] = coords[1];
- }
- while (it->has_next(it)) {
- it->next(it);
- cmd = stroke_itr_command(it);
- stroke_itr_coords(it, coords);
- if (!is_segment_null(cmd, coords, data))
- return;
- }
- /* generate the square/round cap */
- if (stroker->cap_style == VG_CAP_SQUARE) {
- VGfloat offset = stroker->stroke_width / 2;
- stroker_emit_move_to(stroker, data[0] - offset,
- data[1] - offset);
- stroker_emit_line_to(stroker, data[0] + offset,
- data[1] - offset);
- stroker_emit_line_to(stroker, data[0] + offset,
- data[1] + offset);
- stroker_emit_line_to(stroker, data[0] - offset,
- data[1] + offset);
- stroker_emit_line_to(stroker, data[0] - offset,
- data[1] - offset);
- } else if (stroker->cap_style == VG_CAP_ROUND) {
- VGfloat offset = stroker->stroke_width / 2;
- VGfloat cx = data[0], cy = data[1];
- { /*circle */
- struct arc arc;
- struct matrix matrix;
- matrix_load_identity(&matrix);
-
- stroker_emit_move_to(stroker, cx + offset, cy);
- arc_init(&arc, VG_SCCWARC_TO,
- cx + offset, cy,
- cx - offset, cy,
- offset, offset, 0);
- arc_stroker_emit(&arc, stroker, &matrix);
- arc_init(&arc, VG_SCCWARC_TO,
- cx - offset, cy,
- cx + offset, cy,
- offset, offset, 0);
- arc_stroker_emit(&arc, stroker, &matrix);
- }
- }
- }
- }
-}
-
-static INLINE VGfloat dash_pattern(struct dash_stroker *stroker,
- VGint idx)
-{
- if (stroker->dash_pattern[idx] < 0)
- return 0.f;
- return stroker->dash_pattern[idx];
-}
-
-static void dash_stroker_process_subpath(struct stroker *str)
-{
- struct dash_stroker *stroker = (struct dash_stroker *)str;
- VGfloat sum_length = 0;
- VGint i;
- VGint idash = 0;
- VGfloat pos = 0;
- VGfloat elen = 0;
- VGfloat doffset = stroker->dash_phase;
- VGfloat estart = 0;
- VGfloat estop = 0;
- VGfloat cline[4];
- struct stroke_iterator it;
- VGfloat prev[2];
- VGfloat move_to_pos[2];
- VGfloat line_to_pos[2];
-
- VGboolean has_move_to = VG_FALSE;
-
- stroke_flat_iterator(&it, stroker->base.segments,
- stroker->base.control_points);
-
- stroke_itr_coords(&it, prev);
- move_to_pos[0] = prev[0];
- move_to_pos[1] = prev[1];
-
- debug_assert(stroker->dash_pattern_num > 0);
-
- for (i = 0; i < stroker->dash_pattern_num; ++i) {
- sum_length += dash_pattern(stroker, i);
- }
-
- if (floatIsZero(sum_length)) {
- return;
- }
-
- doffset -= floorf(doffset / sum_length) * sum_length;
-
- while (!floatIsZero(doffset) && doffset >= dash_pattern(stroker, idash)) {
- doffset -= dash_pattern(stroker, idash);
- idash = (idash + 1) % stroker->dash_pattern_num;
- }
-
- while (it.has_next(&it)) {
- VGPathCommand cmd;
- VGfloat coords[8];
- VGboolean done;
-
- it.next(&it);
- cmd = stroke_itr_command(&it);
- stroke_itr_coords(&it, coords);
-
- debug_assert(cmd == VG_LINE_TO_ABS);
- cline[0] = prev[0];
- cline[1] = prev[1];
- cline[2] = coords[0];
- cline[3] = coords[1];
-
- elen = line_lengthv(cline);
-
- estop = estart + elen;
-
- done = pos >= estop;
- while (!done) {
- VGfloat p2[2];
-
- VGint idash_incr = 0;
- VGboolean has_offset = doffset > 0;
- VGfloat dpos = pos + dash_pattern(stroker, idash) - doffset - estart;
-
- debug_assert(dpos >= 0);
-
- if (dpos > elen) { /* dash extends this line */
- doffset = dash_pattern(stroker, idash) - (dpos - elen);
- pos = estop;
- done = VG_TRUE;
- p2[0] = cline[2];
- p2[1] = cline[3];
- } else { /* Dash is on this line */
- line_point_at(cline, dpos/elen, p2);
- pos = dpos + estart;
- done = pos >= estop;
- idash_incr = 1;
- doffset = 0;
- }
-
- if (idash % 2 == 0) {
- line_to_pos[0] = p2[0];
- line_to_pos[1] = p2[1];
-
- if (!has_offset || !has_move_to) {
- stroker_move_to(&stroker->stroker, move_to_pos[0], move_to_pos[1]);
- has_move_to = VG_TRUE;
- }
- stroker_line_to(&stroker->stroker, line_to_pos[0], line_to_pos[1]);
- } else {
- move_to_pos[0] = p2[0];
- move_to_pos[1] = p2[1];
- }
-
- idash = (idash + idash_incr) % stroker->dash_pattern_num;
- }
-
- estart = estop;
- prev[0] = coords[0];
- prev[1] = coords[1];
- }
-
- if (it.curve_poly) {
- polygon_destroy(it.curve_poly);
- it.curve_poly = 0;
- }
-
- stroker->base.path = stroker->stroker.path;
-}
-
-static void default_begin(struct stroker *stroker)
-{
- array_reset(stroker->segments);
- array_reset(stroker->control_points);
-}
-
-static void default_end(struct stroker *stroker)
-{
- if (stroker->segments->num_elements > 0)
- stroker->process_subpath(stroker);
-}
-
-
-static void dash_stroker_begin(struct stroker *stroker)
-{
- struct dash_stroker *dasher =
- (struct dash_stroker *)stroker;
-
- default_begin(&dasher->stroker);
- default_begin(stroker);
-}
-
-static void dash_stroker_end(struct stroker *stroker)
-{
- struct dash_stroker *dasher =
- (struct dash_stroker *)stroker;
-
- default_end(stroker);
- default_end(&dasher->stroker);
-}
-
-void stroker_init(struct stroker *stroker,
- struct vg_state *state)
-{
- stroker->stroke_width = state->stroke.line_width.f;
- stroker->miter_limit = state->stroke.miter_limit.f;
- stroker->cap_style = state->stroke.cap_style;
- stroker->join_style = state->stroke.join_style;
-
- stroker->begin = default_begin;
- stroker->process_subpath = stroker_process_subpath;
- stroker->end = default_end;
-
- stroker->segments = array_create(sizeof(VGubyte));
- stroker->control_points = array_create(sizeof(VGfloat));
-
- stroker->back1_x = 0;
- stroker->back1_y = 0;
- stroker->back2_x = 0;
- stroker->back2_y = 0;
-
- stroker->path = path_create(VG_PATH_DATATYPE_F, 1.0f, 0.0f,
- 0, 0, VG_PATH_CAPABILITY_ALL);
-
- /* Initialize with an invalid value */
- stroker->last_cmd = (VGPathCommand)0;
-}
-
-void dash_stroker_init(struct stroker *str,
- struct vg_state *state)
-{
- struct dash_stroker *stroker = (struct dash_stroker *)str;
- int i;
-
- stroker_init(str, state);
- stroker_init(&stroker->stroker, state);
-
- {
- int real_num = state->stroke.dash_pattern_num;
- if (real_num % 2)/* if odd, ignore the last one */
- --real_num;
- for (i = 0; i < real_num; ++i)
- stroker->dash_pattern[i] = state->stroke.dash_pattern[i].f;
- stroker->dash_pattern_num = real_num;
- }
-
- stroker->dash_phase = state->stroke.dash_phase.f;
- stroker->dash_phase_reset = state->stroke.dash_phase_reset;
-
- stroker->base.begin = dash_stroker_begin;
- stroker->base.process_subpath = dash_stroker_process_subpath;
- stroker->base.end = dash_stroker_end;
- path_destroy(stroker->base.path);
- stroker->base.path = NULL;
-}
-
-void stroker_begin(struct stroker *stroker)
-{
- stroker->begin(stroker);
-}
-
-void stroker_end(struct stroker *stroker)
-{
- stroker->end(stroker);
-}
-
-void stroker_cleanup(struct stroker *stroker)
-{
- array_destroy(stroker->segments);
- array_destroy(stroker->control_points);
-}
-
-void dash_stroker_cleanup(struct dash_stroker *stroker)
-{
- /* if stroker->base.path is null means we never
- * processed a valid path so delete the temp one
- * we already created */
- if (!stroker->base.path)
- path_destroy(stroker->stroker.path);
- stroker_cleanup(&stroker->stroker);
- stroker_cleanup((struct stroker*)stroker);
-}
projects / mesa.git / blobdiff