forked from enlightenment/efl
evas: add utility function to build path.
This commit is contained in:
Cedric BAIL
parent
9ba6e1a0ae
commit
45ccb8f6d1
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@ -218,7 +218,8 @@ lib/evas/canvas/evas_vg_container.c \
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lib/evas/canvas/evas_vg_root_node.c \
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lib/evas/canvas/evas_vg_gradient.c \
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lib/evas/canvas/evas_vg_gradient_linear.c \
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lib/evas/canvas/evas_vg_gradient_radial.c
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lib/evas/canvas/evas_vg_gradient_radial.c \
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lib/evas/canvas/evas_vg_utils.c
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# Engine
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lib_evas_libevas_la_SOURCES += \
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@ -0,0 +1,198 @@
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#include "evas_common_private.h"
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#include "evas_private.h"
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static unsigned int
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evas_vg_path_command_length(Evas_VG_Path_Command command)
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{
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switch (command)
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{
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case EVAS_VG_PATH_COMMAND_TYPE_END: return 0;
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case EVAS_VG_PATH_COMMAND_TYPE_MOVE_TO: return 2;
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case EVAS_VG_PATH_COMMAND_TYPE_LINE_TO: return 2;
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case EVAS_VG_PATH_COMMAND_TYPE_QUADRATIC_TO: return 4;
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case EVAS_VG_PATH_COMMAND_TYPE_SQUADRATIC_TO: return 2;
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case EVAS_VG_PATH_COMMAND_TYPE_CUBIC_TO: return 6;
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case EVAS_VG_PATH_COMMAND_TYPE_SCUBIC_TO: return 4;
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case EVAS_VG_PATH_COMMAND_TYPE_ARC_TO: return 5;
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case EVAS_VG_PATH_COMMAND_TYPE_CLOSE: return 0;
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case EVAS_VG_PATH_COMMAND_TYPE_LAST: return 0;
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}
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return 0;
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}
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static inline Eina_Bool
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evas_vg_path_grow(Evas_VG_Path_Command command,
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Evas_VG_Path_Command **commands, double **points,
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double **offset_point)
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{
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Evas_VG_Path_Command *cmd_tmp;
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double *pts_tmp;
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unsigned int cmd_length = 0, pts_length = 0;
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if (command)
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{
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while (commands[cmd_length] != EVAS_VG_PATH_COMMAND_TYPE_END)
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{
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pts_length += evas_vg_path_command_length((*commands)[cmd_length]);
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cmd_length++;
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}
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}
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// Accounting for END command and handle gracefully the NULL case at the same time
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cmd_length++;
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if (evas_vg_path_command_length(command))
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{
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pts_length += evas_vg_path_command_length(command);
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pts_tmp = realloc(*points, pts_length * sizeof (double));
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if (!pts_tmp) return EINA_FALSE;
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*points = pts_tmp;
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*offset_point = *points + pts_length - evas_vg_path_command_length(command);
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}
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cmd_tmp = realloc(*commands,
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(cmd_length + 1) * sizeof (Evas_VG_Path_Command));
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if (!cmd_tmp) return EINA_FALSE;
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*commands = cmd_tmp;
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// Append the command
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cmd_tmp[cmd_length - 1] = command;
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// NULL terminate the stream
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cmd_tmp[cmd_length] = EVAS_VG_PATH_COMMAND_TYPE_END;
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return EINA_TRUE;
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}
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void
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evas_vg_path_append_move_to(Evas_VG_Path_Command **commands, double **points,
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double x, double y)
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{
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double *offset_point;
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if (!evas_vg_path_grow(EVAS_VG_PATH_COMMAND_TYPE_MOVE_TO,
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commands, points, &offset_point))
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return ;
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offset_point[0] = x;
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offset_point[1] = y;
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}
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void
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evas_vg_path_append_line_to(Evas_VG_Path_Command **commands, double **points,
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double x, double y)
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{
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double *offset_point;
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if (!evas_vg_path_grow(EVAS_VG_PATH_COMMAND_TYPE_LINE_TO,
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commands, points, &offset_point))
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return ;
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offset_point[0] = x;
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offset_point[1] = y;
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}
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void
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evas_vg_path_append_quadratic_to(Evas_VG_Path_Command **commands, double **points,
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double x, double y, double ctrl_x, double ctrl_y)
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{
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double *offset_point;
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if (!evas_vg_path_grow(EVAS_VG_PATH_COMMAND_TYPE_QUADRATIC_TO,
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commands, points, &offset_point))
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return ;
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offset_point[0] = x;
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offset_point[1] = y;
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offset_point[2] = ctrl_x;
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offset_point[3] = ctrl_y;
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}
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void
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evas_vg_path_append_squadratic_to(Evas_VG_Path_Command **commands, double **points,
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double x, double y)
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{
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double *offset_point;
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if (!evas_vg_path_grow(EVAS_VG_PATH_COMMAND_TYPE_SQUADRATIC_TO,
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commands, points, &offset_point))
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return ;
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offset_point[0] = x;
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offset_point[1] = y;
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}
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void
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evas_vg_path_append_cubic_to(Evas_VG_Path_Command **commands, double **points,
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double x, double y,
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double ctrl_x0, double ctrl_y0,
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double ctrl_x1, double ctrl_y1)
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{
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double *offset_point;
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if (!evas_vg_path_grow(EVAS_VG_PATH_COMMAND_TYPE_CUBIC_TO,
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commands, points, &offset_point))
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return ;
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offset_point[0] = x;
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offset_point[1] = y;
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offset_point[2] = ctrl_x0;
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offset_point[3] = ctrl_y0;
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offset_point[4] = ctrl_x1;
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offset_point[5] = ctrl_y1;
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}
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void
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evas_vg_path_append_scubic_to(Evas_VG_Path_Command **commands, double **points,
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double x, double y,
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double ctrl_x, double ctrl_y)
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{
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double *offset_point;
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if (!evas_vg_path_grow(EVAS_VG_PATH_COMMAND_TYPE_SCUBIC_TO,
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commands, points, &offset_point))
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return ;
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offset_point[0] = x;
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offset_point[1] = y;
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offset_point[2] = ctrl_x;
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offset_point[3] = ctrl_y;
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}
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void
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evas_vg_path_append_arc_to(Evas_VG_Path_Command **commands, double **points,
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double x, double y,
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double rx, double ry,
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double angle)
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{
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double *offset_point;
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if (!evas_vg_path_grow(EVAS_VG_PATH_COMMAND_TYPE_ARC_TO,
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commands, points, &offset_point))
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return ;
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offset_point[0] = x;
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offset_point[1] = y;
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offset_point[2] = rx;
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offset_point[3] = ry;
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offset_point[4] = angle;
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}
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void
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evas_vg_path_append_close(Evas_VG_Path_Command **commands, double **points)
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{
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double *offset_point;
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evas_vg_path_grow(EVAS_VG_PATH_COMMAND_TYPE_ARC_TO,
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commands, points, &offset_point);
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}
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void
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evas_vg_path_append_circle(Evas_VG_Path_Command **commands, double **points,
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double x, double y, double radius)
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{
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evas_vg_path_append_move_to(commands, points, x, y - radius);
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evas_vg_path_append_arc_to(commands, points, x + radius, y, radius, radius, 0);
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evas_vg_path_append_arc_to(commands, points, x, y + radius, radius, radius, 0);
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evas_vg_path_append_arc_to(commands, points, x - radius, y, radius, radius, 0);
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evas_vg_path_append_arc_to(commands, points, x, y - radius, radius, radius, 0);
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}
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