mirror of
https://github.com/python-pillow/Pillow.git
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1111 lines
25 KiB
C
1111 lines
25 KiB
C
/*
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* The Python Imaging Library.
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* $Id$
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*
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* a simple drawing package for the Imaging library
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*
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* history:
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* 1996-04-13 fl Created.
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* 1996-04-30 fl Added transforms and polygon support.
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* 1996-08-12 fl Added filled polygons.
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* 1996-11-05 fl Fixed float/int confusion in polygon filler
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* 1997-07-04 fl Support 32-bit images (C++ would have been nice)
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* 1998-09-09 fl Eliminated qsort casts; improved rectangle clipping
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* 1998-09-10 fl Fixed fill rectangle to include lower edge (!)
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* 1998-12-29 fl Added arc, chord, and pieslice primitives
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* 1999-01-10 fl Added some level 2 ("arrow") stuff (experimental)
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* 1999-02-06 fl Added bitmap primitive
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* 1999-07-26 fl Eliminated a compiler warning
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* 1999-07-31 fl Pass ink as void* instead of int
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* 2002-12-10 fl Added experimental RGBA-on-RGB drawing
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* 2004-09-04 fl Support simple wide lines (no joins)
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* 2005-05-25 fl Fixed line width calculation
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*
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* Copyright (c) 1996-2006 by Fredrik Lundh
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* Copyright (c) 1997-2006 by Secret Labs AB.
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*
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* See the README file for information on usage and redistribution.
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*/
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/* FIXME: support fill/outline attribute for all filled shapes */
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/* FIXME: support zero-winding fill */
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/* FIXME: add drawing context, support affine transforms */
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/* FIXME: support clip window (and mask?) */
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#include "Imaging.h"
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#include <math.h>
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#define CEIL(v) (int) ceil(v)
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#define FLOOR(v) ((v) >= 0.0 ? (int) (v) : (int) floor(v))
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#define INK8(ink) (*(UINT8*)ink)
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#define INK32(ink) (*(INT32*)ink)
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/* like (a * b + 127) / 255), but much faster on most platforms */
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#define MULDIV255(a, b, tmp)\
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(tmp = (a) * (b) + 128, ((((tmp) >> 8) + (tmp)) >> 8))
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#define BLEND(mask, in1, in2, tmp1, tmp2)\
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(MULDIV255(in1, 255 - mask, tmp1) + MULDIV255(in2, mask, tmp2))
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/*
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* Rounds around zero (up=away from zero, down=torwards zero)
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* This guarantees that ROUND_UP|DOWN(f) == -ROUND_UP|DOWN(-f)
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*/
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#define ROUND_UP(f) ((int) ((f) >= 0.0 ? floor((f) + 0.5F) : -floor(fabs(f) + 0.5F)))
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#define ROUND_DOWN(f) ((int) ((f) >= 0.0 ? ceil((f) - 0.5F) : -ceil(fabs(f) - 0.5F)))
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/* -------------------------------------------------------------------- */
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/* Primitives */
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/* -------------------------------------------------------------------- */
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typedef struct {
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/* edge descriptor for polygon engine */
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int d;
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int x0, y0;
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int xmin, ymin, xmax, ymax;
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float dx;
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} Edge;
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/* Type used in "polygon*" functions */
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typedef void (*hline_handler)(Imaging, int, int, int, int);
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static inline void
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point8(Imaging im, int x, int y, int ink)
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{
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if (x >= 0 && x < im->xsize && y >= 0 && y < im->ysize)
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im->image8[y][x] = (UINT8) ink;
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}
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static inline void
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point32(Imaging im, int x, int y, int ink)
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{
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if (x >= 0 && x < im->xsize && y >= 0 && y < im->ysize)
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im->image32[y][x] = ink;
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}
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static inline void
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point32rgba(Imaging im, int x, int y, int ink)
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{
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unsigned int tmp1, tmp2;
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if (x >= 0 && x < im->xsize && y >= 0 && y < im->ysize) {
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UINT8* out = (UINT8*) im->image[y]+x*4;
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UINT8* in = (UINT8*) &ink;
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out[0] = BLEND(in[3], out[0], in[0], tmp1, tmp2);
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out[1] = BLEND(in[3], out[1], in[1], tmp1, tmp2);
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out[2] = BLEND(in[3], out[2], in[2], tmp1, tmp2);
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}
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}
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static inline void
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hline8(Imaging im, int x0, int y0, int x1, int ink)
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{
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int tmp;
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if (y0 >= 0 && y0 < im->ysize) {
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if (x0 > x1)
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tmp = x0, x0 = x1, x1 = tmp;
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if (x0 < 0)
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x0 = 0;
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else if (x0 >= im->xsize)
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return;
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if (x1 < 0)
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return;
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else if (x1 >= im->xsize)
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x1 = im->xsize-1;
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if (x0 <= x1)
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memset(im->image8[y0] + x0, (UINT8) ink, x1 - x0 + 1);
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}
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}
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static inline void
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hline32(Imaging im, int x0, int y0, int x1, int ink)
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{
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int tmp;
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INT32* p;
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if (y0 >= 0 && y0 < im->ysize) {
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if (x0 > x1)
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tmp = x0, x0 = x1, x1 = tmp;
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if (x0 < 0)
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x0 = 0;
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else if (x0 >= im->xsize)
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return;
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if (x1 < 0)
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return;
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else if (x1 >= im->xsize)
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x1 = im->xsize-1;
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p = im->image32[y0];
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while (x0 <= x1)
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p[x0++] = ink;
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}
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}
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static inline void
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hline32rgba(Imaging im, int x0, int y0, int x1, int ink)
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{
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int tmp;
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unsigned int tmp1, tmp2;
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if (y0 >= 0 && y0 < im->ysize) {
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if (x0 > x1)
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tmp = x0, x0 = x1, x1 = tmp;
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if (x0 < 0)
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x0 = 0;
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else if (x0 >= im->xsize)
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return;
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if (x1 < 0)
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return;
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else if (x1 >= im->xsize)
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x1 = im->xsize-1;
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if (x0 <= x1) {
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UINT8* out = (UINT8*) im->image[y0]+x0*4;
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UINT8* in = (UINT8*) &ink;
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while (x0 <= x1) {
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out[0] = BLEND(in[3], out[0], in[0], tmp1, tmp2);
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out[1] = BLEND(in[3], out[1], in[1], tmp1, tmp2);
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out[2] = BLEND(in[3], out[2], in[2], tmp1, tmp2);
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x0++; out += 4;
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}
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}
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}
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}
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static inline void
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line8(Imaging im, int x0, int y0, int x1, int y1, int ink)
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{
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int i, n, e;
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int dx, dy;
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int xs, ys;
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/* normalize coordinates */
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dx = x1-x0;
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if (dx < 0)
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dx = -dx, xs = -1;
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else
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xs = 1;
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dy = y1-y0;
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if (dy < 0)
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dy = -dy, ys = -1;
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else
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ys = 1;
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n = (dx > dy) ? dx : dy;
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if (dx == 0)
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/* vertical */
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for (i = 0; i < dy; i++) {
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point8(im, x0, y0, ink);
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y0 += ys;
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}
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else if (dy == 0)
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/* horizontal */
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for (i = 0; i < dx; i++) {
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point8(im, x0, y0, ink);
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x0 += xs;
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}
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else if (dx > dy) {
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/* bresenham, horizontal slope */
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n = dx;
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dy += dy;
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e = dy - dx;
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dx += dx;
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for (i = 0; i < n; i++) {
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point8(im, x0, y0, ink);
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if (e >= 0) {
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y0 += ys;
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e -= dx;
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}
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e += dy;
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x0 += xs;
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}
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} else {
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/* bresenham, vertical slope */
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n = dy;
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dx += dx;
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e = dx - dy;
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dy += dy;
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for (i = 0; i < n; i++) {
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point8(im, x0, y0, ink);
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if (e >= 0) {
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x0 += xs;
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e -= dy;
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}
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e += dx;
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y0 += ys;
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}
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}
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}
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static inline void
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line32(Imaging im, int x0, int y0, int x1, int y1, int ink)
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{
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int i, n, e;
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int dx, dy;
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int xs, ys;
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/* normalize coordinates */
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dx = x1-x0;
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if (dx < 0)
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dx = -dx, xs = -1;
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else
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xs = 1;
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dy = y1-y0;
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if (dy < 0)
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dy = -dy, ys = -1;
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else
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ys = 1;
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n = (dx > dy) ? dx : dy;
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if (dx == 0)
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/* vertical */
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for (i = 0; i < dy; i++) {
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point32(im, x0, y0, ink);
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y0 += ys;
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}
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else if (dy == 0)
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/* horizontal */
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for (i = 0; i < dx; i++) {
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point32(im, x0, y0, ink);
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x0 += xs;
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}
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else if (dx > dy) {
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/* bresenham, horizontal slope */
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n = dx;
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dy += dy;
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e = dy - dx;
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dx += dx;
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for (i = 0; i < n; i++) {
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point32(im, x0, y0, ink);
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if (e >= 0) {
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y0 += ys;
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e -= dx;
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}
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e += dy;
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x0 += xs;
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}
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} else {
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/* bresenham, vertical slope */
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n = dy;
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dx += dx;
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e = dx - dy;
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dy += dy;
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for (i = 0; i < n; i++) {
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point32(im, x0, y0, ink);
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if (e >= 0) {
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x0 += xs;
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e -= dy;
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}
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e += dx;
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y0 += ys;
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}
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}
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}
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static inline void
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line32rgba(Imaging im, int x0, int y0, int x1, int y1, int ink)
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{
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int i, n, e;
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int dx, dy;
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int xs, ys;
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/* normalize coordinates */
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dx = x1-x0;
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if (dx < 0)
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dx = -dx, xs = -1;
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else
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xs = 1;
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dy = y1-y0;
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if (dy < 0)
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dy = -dy, ys = -1;
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else
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ys = 1;
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n = (dx > dy) ? dx : dy;
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if (dx == 0)
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/* vertical */
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for (i = 0; i < dy; i++) {
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point32rgba(im, x0, y0, ink);
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y0 += ys;
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}
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else if (dy == 0)
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/* horizontal */
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for (i = 0; i < dx; i++) {
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point32rgba(im, x0, y0, ink);
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x0 += xs;
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}
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else if (dx > dy) {
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/* bresenham, horizontal slope */
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n = dx;
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dy += dy;
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e = dy - dx;
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dx += dx;
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for (i = 0; i < n; i++) {
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point32rgba(im, x0, y0, ink);
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if (e >= 0) {
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y0 += ys;
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e -= dx;
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}
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e += dy;
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x0 += xs;
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}
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} else {
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/* bresenham, vertical slope */
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n = dy;
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dx += dx;
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e = dx - dy;
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dy += dy;
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for (i = 0; i < n; i++) {
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point32rgba(im, x0, y0, ink);
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if (e >= 0) {
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x0 += xs;
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e -= dy;
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}
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e += dx;
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y0 += ys;
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}
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}
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}
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static int
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x_cmp(const void *x0, const void *x1)
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{
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float diff = *((float*)x0) - *((float*)x1);
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if (diff < 0)
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return -1;
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else if (diff > 0)
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return 1;
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else
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return 0;
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}
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/*
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* Filled polygon draw function using scan line algorithm.
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*/
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static inline int
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polygon_generic(Imaging im, int n, Edge *e, int ink, int eofill,
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hline_handler hline)
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{
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Edge** edge_table;
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float* xx;
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int edge_count = 0;
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int ymin = im->ysize - 1;
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int ymax = 0;
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int i;
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if (n <= 0) {
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return 0;
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}
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/* Initialize the edge table and find polygon boundaries */
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edge_table = malloc(sizeof(Edge*) * n);
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if (!edge_table) {
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return -1;
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}
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for (i = 0; i < n; i++) {
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/* This causes that the pixels of horizontal edges are drawn twice :(
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* but without it there are inconsistencies in ellipses */
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if (e[i].ymin == e[i].ymax) {
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(*hline)(im, e[i].xmin, e[i].ymin, e[i].xmax, ink);
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continue;
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}
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if (ymin > e[i].ymin) {
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ymin = e[i].ymin;
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}
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if (ymax < e[i].ymax) {
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ymax = e[i].ymax;
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}
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edge_table[edge_count++] = (e + i);
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}
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if (ymin < 0) {
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ymin = 0;
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}
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if (ymax > im->ysize) {
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ymax = im->ysize;
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}
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/* Process the edge table with a scan line searching for intersections */
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xx = malloc(sizeof(float) * edge_count * 2);
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if (!xx) {
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free(edge_table);
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return -1;
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}
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for (; ymin <= ymax; ymin++) {
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int j = 0;
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for (i = 0; i < edge_count; i++) {
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Edge* current = edge_table[i];
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if (ymin >= current->ymin && ymin <= current->ymax) {
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xx[j++] = (ymin - current->y0) * current->dx + current->x0;
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}
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/* Needed to draw consistent polygons */
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if (ymin == current->ymax && ymin < ymax) {
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xx[j] = xx[j - 1];
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j++;
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}
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}
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qsort(xx, j, sizeof(float), x_cmp);
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for (i = 1; i < j; i += 2) {
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(*hline)(im, ROUND_UP(xx[i - 1]), ymin, ROUND_DOWN(xx[i]), ink);
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}
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}
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free(xx);
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free(edge_table);
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return 0;
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}
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static inline int
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polygon8(Imaging im, int n, Edge *e, int ink, int eofill)
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{
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return polygon_generic(im, n, e, ink, eofill, hline8);
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}
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static inline int
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polygon32(Imaging im, int n, Edge *e, int ink, int eofill)
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{
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return polygon_generic(im, n, e, ink, eofill, hline32);
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}
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static inline int
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polygon32rgba(Imaging im, int n, Edge *e, int ink, int eofill)
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{
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return polygon_generic(im, n, e, ink, eofill, hline32rgba);
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}
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static inline void
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add_edge(Edge *e, int x0, int y0, int x1, int y1)
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{
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/* printf("edge %d %d %d %d\n", x0, y0, x1, y1); */
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if (x0 <= x1)
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e->xmin = x0, e->xmax = x1;
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else
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e->xmin = x1, e->xmax = x0;
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if (y0 <= y1)
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e->ymin = y0, e->ymax = y1;
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else
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e->ymin = y1, e->ymax = y0;
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if (y0 == y1) {
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e->d = 0;
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e->dx = 0.0;
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} else {
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e->dx = ((float)(x1-x0)) / (y1-y0);
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if (y0 == e->ymin)
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e->d = 1;
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else
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e->d = -1;
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}
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e->x0 = x0;
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e->y0 = y0;
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}
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typedef struct {
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void (*point)(Imaging im, int x, int y, int ink);
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void (*hline)(Imaging im, int x0, int y0, int x1, int ink);
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void (*line)(Imaging im, int x0, int y0, int x1, int y1, int ink);
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int (*polygon)(Imaging im, int n, Edge *e, int ink, int eofill);
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} DRAW;
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DRAW draw8 = { point8, hline8, line8, polygon8 };
|
|
DRAW draw32 = { point32, hline32, line32, polygon32 };
|
|
DRAW draw32rgba = { point32rgba, hline32rgba, line32rgba, polygon32rgba };
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* Interface */
|
|
/* -------------------------------------------------------------------- */
|
|
|
|
#define DRAWINIT()\
|
|
if (im->image8) {\
|
|
draw = &draw8;\
|
|
ink = INK8(ink_);\
|
|
} else {\
|
|
draw = (op) ? &draw32rgba : &draw32; \
|
|
ink = INK32(ink_);\
|
|
}
|
|
|
|
int
|
|
ImagingDrawPoint(Imaging im, int x0, int y0, const void* ink_, int op)
|
|
{
|
|
DRAW* draw;
|
|
INT32 ink;
|
|
|
|
DRAWINIT();
|
|
|
|
draw->point(im, x0, y0, ink);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingDrawLine(Imaging im, int x0, int y0, int x1, int y1, const void* ink_,
|
|
int op)
|
|
{
|
|
DRAW* draw;
|
|
INT32 ink;
|
|
|
|
DRAWINIT();
|
|
|
|
draw->line(im, x0, y0, x1, y1, ink);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingDrawWideLine(Imaging im, int x0, int y0, int x1, int y1,
|
|
const void* ink_, int width, int op)
|
|
{
|
|
DRAW* draw;
|
|
INT32 ink;
|
|
int dx, dy;
|
|
double big_hypotenuse, small_hypotenuse, ratio_max, ratio_min;
|
|
int dxmin, dxmax, dymin, dymax;
|
|
Edge e[4];
|
|
|
|
DRAWINIT();
|
|
|
|
if (width <= 1) {
|
|
draw->line(im, x0, y0, x1, y1, ink);
|
|
return 0;
|
|
}
|
|
|
|
dx = x1-x0;
|
|
dy = y1-y0;
|
|
if (dx == 0 && dy == 0) {
|
|
draw->point(im, x0, y0, ink);
|
|
return 0;
|
|
}
|
|
|
|
big_hypotenuse = sqrt((double) (dx*dx + dy*dy));
|
|
small_hypotenuse = (width - 1) / 2.0;
|
|
ratio_max = ROUND_UP(small_hypotenuse) / big_hypotenuse;
|
|
ratio_min = ROUND_DOWN(small_hypotenuse) / big_hypotenuse;
|
|
|
|
dxmin = ROUND_DOWN(ratio_min * dy);
|
|
dxmax = ROUND_DOWN(ratio_max * dy);
|
|
dymin = ROUND_DOWN(ratio_min * dx);
|
|
dymax = ROUND_DOWN(ratio_max * dx);
|
|
{
|
|
int vertices[4][2] = {
|
|
{x0 - dxmin, y0 + dymax},
|
|
{x1 - dxmin, y1 + dymax},
|
|
{x1 + dxmax, y1 - dymin},
|
|
{x0 + dxmax, y0 - dymin}
|
|
};
|
|
|
|
add_edge(e+0, vertices[0][0], vertices[0][1], vertices[1][0], vertices[1][1]);
|
|
add_edge(e+1, vertices[1][0], vertices[1][1], vertices[2][0], vertices[2][1]);
|
|
add_edge(e+2, vertices[2][0], vertices[2][1], vertices[3][0], vertices[3][1]);
|
|
add_edge(e+3, vertices[3][0], vertices[3][1], vertices[0][0], vertices[0][1]);
|
|
|
|
draw->polygon(im, 4, e, ink, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingDrawRectangle(Imaging im, int x0, int y0, int x1, int y1,
|
|
const void* ink_, int fill, int op)
|
|
{
|
|
int y;
|
|
int tmp;
|
|
DRAW* draw;
|
|
INT32 ink;
|
|
|
|
DRAWINIT();
|
|
|
|
if (y0 > y1)
|
|
tmp = y0, y0 = y1, y1 = tmp;
|
|
|
|
if (fill) {
|
|
|
|
if (y0 < 0)
|
|
y0 = 0;
|
|
else if (y0 >= im->ysize)
|
|
return 0;
|
|
|
|
if (y1 < 0)
|
|
return 0;
|
|
else if (y1 > im->ysize)
|
|
y1 = im->ysize;
|
|
|
|
for (y = y0; y <= y1; y++)
|
|
draw->hline(im, x0, y, x1, ink);
|
|
|
|
} else {
|
|
|
|
/* outline */
|
|
draw->line(im, x0, y0, x1, y0, ink);
|
|
draw->line(im, x1, y0, x1, y1, ink);
|
|
draw->line(im, x1, y1, x0, y1, ink);
|
|
draw->line(im, x0, y1, x0, y0, ink);
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingDrawPolygon(Imaging im, int count, int* xy, const void* ink_,
|
|
int fill, int op)
|
|
{
|
|
int i, n;
|
|
DRAW* draw;
|
|
INT32 ink;
|
|
|
|
if (count <= 0)
|
|
return 0;
|
|
|
|
DRAWINIT();
|
|
|
|
if (fill) {
|
|
|
|
/* Build edge list */
|
|
Edge* e = malloc(count * sizeof(Edge));
|
|
if (!e) {
|
|
(void) ImagingError_MemoryError();
|
|
return -1;
|
|
}
|
|
for (i = n = 0; i < count-1; i++)
|
|
add_edge(&e[n++], xy[i+i], xy[i+i+1], xy[i+i+2], xy[i+i+3]);
|
|
if (xy[i+i] != xy[0] || xy[i+i+1] != xy[1])
|
|
add_edge(&e[n++], xy[i+i], xy[i+i+1], xy[0], xy[1]);
|
|
draw->polygon(im, n, e, ink, 0);
|
|
free(e);
|
|
|
|
} else {
|
|
|
|
/* Outline */
|
|
for (i = 0; i < count-1; i++)
|
|
draw->line(im, xy[i+i], xy[i+i+1], xy[i+i+2], xy[i+i+3], ink);
|
|
draw->line(im, xy[i+i], xy[i+i+1], xy[0], xy[1], ink);
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingDrawBitmap(Imaging im, int x0, int y0, Imaging bitmap, const void* ink,
|
|
int op)
|
|
{
|
|
return ImagingFill2(
|
|
im, ink, bitmap,
|
|
x0, y0, x0 + bitmap->xsize, y0 + bitmap->ysize
|
|
);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
/* standard shapes */
|
|
|
|
#define ARC 0
|
|
#define CHORD 1
|
|
#define PIESLICE 2
|
|
|
|
static int
|
|
ellipse(Imaging im, int x0, int y0, int x1, int y1,
|
|
int start, int end, const void* ink_, int fill,
|
|
int mode, int op)
|
|
{
|
|
int i, n;
|
|
int cx, cy;
|
|
int w, h;
|
|
int x = 0, y = 0;
|
|
int lx = 0, ly = 0;
|
|
int sx = 0, sy = 0;
|
|
DRAW* draw;
|
|
INT32 ink;
|
|
|
|
w = x1 - x0;
|
|
h = y1 - y0;
|
|
if (w < 0 || h < 0)
|
|
return 0;
|
|
|
|
DRAWINIT();
|
|
|
|
cx = (x0 + x1) / 2;
|
|
cy = (y0 + y1) / 2;
|
|
|
|
while (end < start)
|
|
end += 360;
|
|
|
|
if (mode != ARC && fill) {
|
|
|
|
/* Build edge list */
|
|
Edge* e = malloc((end - start + 3) * sizeof(Edge));
|
|
if (!e) {
|
|
ImagingError_MemoryError();
|
|
return -1;
|
|
}
|
|
|
|
n = 0;
|
|
|
|
for (i = start; i <= end; i++) {
|
|
x = FLOOR((cos(i*M_PI/180) * w/2) + cx + 0.5);
|
|
y = FLOOR((sin(i*M_PI/180) * h/2) + cy + 0.5);
|
|
if (i != start)
|
|
add_edge(&e[n++], lx, ly, x, y);
|
|
else
|
|
sx = x, sy = y;
|
|
lx = x, ly = y;
|
|
}
|
|
|
|
if (n > 0) {
|
|
/* close and draw polygon */
|
|
if (mode == PIESLICE) {
|
|
if (x != cx || y != cy) {
|
|
add_edge(&e[n++], x, y, cx, cy);
|
|
add_edge(&e[n++], cx, cy, sx, sy);
|
|
}
|
|
} else {
|
|
if (x != sx || y != sy)
|
|
add_edge(&e[n++], x, y, sx, sy);
|
|
}
|
|
draw->polygon(im, n, e, ink, 0);
|
|
}
|
|
|
|
free(e);
|
|
|
|
} else {
|
|
|
|
for (i = start; i <= end; i++) {
|
|
x = FLOOR((cos(i*M_PI/180) * w/2) + cx + 0.5);
|
|
y = FLOOR((sin(i*M_PI/180) * h/2) + cy + 0.5);
|
|
if (i != start)
|
|
draw->line(im, lx, ly, x, y, ink);
|
|
else
|
|
sx = x, sy = y;
|
|
lx = x, ly = y;
|
|
}
|
|
|
|
if (i != start) {
|
|
if (mode == PIESLICE) {
|
|
if (x != cx || y != cy) {
|
|
draw->line(im, x, y, cx, cy, ink);
|
|
draw->line(im, cx, cy, sx, sy, ink);
|
|
}
|
|
} else if (mode == CHORD) {
|
|
if (x != sx || y != sy)
|
|
draw->line(im, x, y, sx, sy, ink);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingDrawArc(Imaging im, int x0, int y0, int x1, int y1,
|
|
int start, int end, const void* ink, int op)
|
|
{
|
|
return ellipse(im, x0, y0, x1, y1, start, end, ink, 0, ARC, op);
|
|
}
|
|
|
|
int
|
|
ImagingDrawChord(Imaging im, int x0, int y0, int x1, int y1,
|
|
int start, int end, const void* ink, int fill, int op)
|
|
{
|
|
return ellipse(im, x0, y0, x1, y1, start, end, ink, fill, CHORD, op);
|
|
}
|
|
|
|
int
|
|
ImagingDrawEllipse(Imaging im, int x0, int y0, int x1, int y1,
|
|
const void* ink, int fill, int op)
|
|
{
|
|
return ellipse(im, x0, y0, x1, y1, 0, 360, ink, fill, CHORD, op);
|
|
}
|
|
|
|
int
|
|
ImagingDrawPieslice(Imaging im, int x0, int y0, int x1, int y1,
|
|
int start, int end, const void* ink, int fill, int op)
|
|
{
|
|
return ellipse(im, x0, y0, x1, y1, start, end, ink, fill, PIESLICE, op);
|
|
}
|
|
|
|
/* -------------------------------------------------------------------- */
|
|
|
|
/* experimental level 2 ("arrow") graphics stuff. this implements
|
|
portions of the arrow api on top of the Edge structure. the
|
|
semantics are ok, except that "curve" flattens the bezier curves by
|
|
itself */
|
|
|
|
#if 1 /* ARROW_GRAPHICS */
|
|
|
|
struct ImagingOutlineInstance {
|
|
|
|
float x0, y0;
|
|
|
|
float x, y;
|
|
|
|
int count;
|
|
Edge *edges;
|
|
|
|
int size;
|
|
|
|
};
|
|
|
|
|
|
ImagingOutline
|
|
ImagingOutlineNew(void)
|
|
{
|
|
ImagingOutline outline;
|
|
|
|
outline = calloc(1, sizeof(struct ImagingOutlineInstance));
|
|
if (!outline)
|
|
return (ImagingOutline) ImagingError_MemoryError();
|
|
|
|
outline->edges = NULL;
|
|
outline->count = outline->size = 0;
|
|
|
|
ImagingOutlineMove(outline, 0, 0);
|
|
|
|
return outline;
|
|
}
|
|
|
|
void
|
|
ImagingOutlineDelete(ImagingOutline outline)
|
|
{
|
|
if (!outline)
|
|
return;
|
|
|
|
if (outline->edges)
|
|
free(outline->edges);
|
|
|
|
free(outline);
|
|
}
|
|
|
|
|
|
static Edge*
|
|
allocate(ImagingOutline outline, int extra)
|
|
{
|
|
Edge* e;
|
|
|
|
if (outline->count + extra > outline->size) {
|
|
/* expand outline buffer */
|
|
outline->size += extra + 25;
|
|
if (!outline->edges)
|
|
e = malloc(outline->size * sizeof(Edge));
|
|
else
|
|
e = realloc(outline->edges, outline->size * sizeof(Edge));
|
|
if (!e)
|
|
return NULL;
|
|
outline->edges = e;
|
|
}
|
|
|
|
e = outline->edges + outline->count;
|
|
|
|
outline->count += extra;
|
|
|
|
return e;
|
|
}
|
|
|
|
int
|
|
ImagingOutlineMove(ImagingOutline outline, float x0, float y0)
|
|
{
|
|
outline->x = outline->x0 = x0;
|
|
outline->y = outline->y0 = y0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingOutlineLine(ImagingOutline outline, float x1, float y1)
|
|
{
|
|
Edge* e;
|
|
|
|
e = allocate(outline, 1);
|
|
if (!e)
|
|
return -1; /* out of memory */
|
|
|
|
add_edge(e, (int) outline->x, (int) outline->y, (int) x1, (int) y1);
|
|
|
|
outline->x = x1;
|
|
outline->y = y1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingOutlineCurve(ImagingOutline outline, float x1, float y1,
|
|
float x2, float y2, float x3, float y3)
|
|
{
|
|
Edge* e;
|
|
int i;
|
|
float xo, yo;
|
|
|
|
#define STEPS 32
|
|
|
|
e = allocate(outline, STEPS);
|
|
if (!e)
|
|
return -1; /* out of memory */
|
|
|
|
xo = outline->x;
|
|
yo = outline->y;
|
|
|
|
/* flatten the bezier segment */
|
|
|
|
for (i = 1; i <= STEPS; i++) {
|
|
|
|
float t = ((float) i) / STEPS;
|
|
float t2 = t*t;
|
|
float t3 = t2*t;
|
|
|
|
float u = 1.0F - t;
|
|
float u2 = u*u;
|
|
float u3 = u2*u;
|
|
|
|
float x = outline->x*u3 + 3*(x1*t*u2 + x2*t2*u) + x3*t3 + 0.5;
|
|
float y = outline->y*u3 + 3*(y1*t*u2 + y2*t2*u) + y3*t3 + 0.5;
|
|
|
|
add_edge(e++, xo, yo, (int) x, (int) y);
|
|
|
|
xo = x, yo = y;
|
|
|
|
}
|
|
|
|
outline->x = xo;
|
|
outline->y = yo;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingOutlineCurve2(ImagingOutline outline, float cx, float cy,
|
|
float x3, float y3)
|
|
{
|
|
/* add bezier curve based on three control points (as
|
|
in the Flash file format) */
|
|
|
|
return ImagingOutlineCurve(
|
|
outline,
|
|
(outline->x + cx + cx)/3, (outline->y + cy + cy)/3,
|
|
(cx + cx + x3)/3, (cy + cy + y3)/3,
|
|
x3, y3);
|
|
}
|
|
|
|
int
|
|
ImagingOutlineClose(ImagingOutline outline)
|
|
{
|
|
if (outline->x == outline->x0 && outline->y == outline->y0)
|
|
return 0;
|
|
return ImagingOutlineLine(outline, outline->x0, outline->y0);
|
|
}
|
|
|
|
int
|
|
ImagingOutlineTransform(ImagingOutline outline, double a[6])
|
|
{
|
|
Edge *eIn;
|
|
Edge *eOut;
|
|
int i, n;
|
|
int x0, y0, x1, y1;
|
|
int X0, Y0, X1, Y1;
|
|
|
|
double a0 = a[0]; double a1 = a[1]; double a2 = a[2];
|
|
double a3 = a[3]; double a4 = a[4]; double a5 = a[5];
|
|
|
|
eIn = outline->edges;
|
|
n = outline->count;
|
|
|
|
/* FIXME: ugly! */
|
|
outline->edges = NULL;
|
|
outline->count = outline->size = 0;
|
|
|
|
eOut = allocate(outline, n);
|
|
if (!eOut) {
|
|
outline->edges = eIn;
|
|
outline->count = outline->size = n;
|
|
ImagingError_MemoryError();
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < n; i++) {
|
|
|
|
x0 = eIn->x0;
|
|
y0 = eIn->y0;
|
|
|
|
/* FIXME: ouch! */
|
|
if (eIn->x0 == eIn->xmin)
|
|
x1 = eIn->xmax;
|
|
else
|
|
x1 = eIn->xmin;
|
|
if (eIn->y0 == eIn->ymin)
|
|
y1 = eIn->ymax;
|
|
else
|
|
y1 = eIn->ymin;
|
|
|
|
/* full moon tonight! if this doesn't work, you may need to
|
|
upgrade your compiler (make sure you have the right service
|
|
pack) */
|
|
|
|
X0 = (int) (a0*x0 + a1*y0 + a2);
|
|
Y0 = (int) (a3*x0 + a4*y0 + a5);
|
|
X1 = (int) (a0*x1 + a1*y1 + a2);
|
|
Y1 = (int) (a3*x1 + a4*y1 + a5);
|
|
|
|
add_edge(eOut, X0, Y0, X1, Y1);
|
|
|
|
eIn++;
|
|
eOut++;
|
|
|
|
}
|
|
|
|
free(eIn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ImagingDrawOutline(Imaging im, ImagingOutline outline, const void* ink_,
|
|
int fill, int op)
|
|
{
|
|
DRAW* draw;
|
|
INT32 ink;
|
|
|
|
DRAWINIT();
|
|
|
|
draw->polygon(im, outline->count, outline->edges, ink, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|