1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
From abcd277ea45e9098bed752cf9c6875b533c0892f Mon Sep 17 00:00:00 2001
From: AlbrechtS <AlbrechtS.svn@fltk.example.org>
Date: Sun, 4 Feb 2018 23:47:38 +0100
Subject: [PATCH] Modify rasterizer to support non-square X,Y axes scaling.
Add new function nsvgRasterizeXY() similar to nsvgRasterize() but with
separate scaling factors for x-axis and y-axis.
---
src/nanosvgrast.h | 78 +++++++++++++++++++++++++++++++----------------
1 file changed, 51 insertions(+), 27 deletions(-)
diff --git a/src/nanosvgrast.h b/src/nanosvgrast.h
index 17ba3b0..a83db27 100644
--- a/src/nanosvgrast.h
+++ b/src/nanosvgrast.h
@@ -22,6 +22,12 @@
*
*/
+/* Modified by FLTK to support non-square X,Y axes scaling.
+ *
+ * Added: nsvgRasterizeXY()
+*/
+
+
#ifndef NANOSVGRAST_H
#define NANOSVGRAST_H
@@ -46,6 +52,9 @@ typedef struct NSVGrasterizer NSVGrasterizer;
unsigned char* img = malloc(w*h*4);
// Rasterize
nsvgRasterize(rast, image, 0,0,1, img, w, h, w*4);
+
+ // For non-square X,Y scaling, use
+ nsvgRasterizeXY(rast, image, 0,0,1,1, img, w, h, w*4);
*/
// Allocated rasterizer context.
@@ -55,7 +64,7 @@ NSVGrasterizer* nsvgCreateRasterizer(void);
// r - pointer to rasterizer context
// image - pointer to image to rasterize
// tx,ty - image offset (applied after scaling)
-// scale - image scale
+// scale - image scale (assumes square aspect ratio)
// dst - pointer to destination image data, 4 bytes per pixel (RGBA)
// w - width of the image to render
// h - height of the image to render
@@ -64,6 +73,12 @@ void nsvgRasterize(NSVGrasterizer* r,
NSVGimage* image, float tx, float ty, float scale,
unsigned char* dst, int w, int h, int stride);
+// As above, but allow X and Y axes to scale independently for non-square aspects
+void nsvgRasterizeXY(NSVGrasterizer* r,
+ NSVGimage* image, float tx, float ty,
+ float sx, float sy,
+ unsigned char* dst, int w, int h, int stride);
+
// Deletes rasterizer context.
void nsvgDeleteRasterizer(NSVGrasterizer*);
@@ -370,7 +385,7 @@ static void nsvg__flattenCubicBez(NSVGrasterizer* r,
nsvg__flattenCubicBez(r, x1234,y1234, x234,y234, x34,y34, x4,y4, level+1, type);
}
-static void nsvg__flattenShape(NSVGrasterizer* r, NSVGshape* shape, float scale)
+static void nsvg__flattenShape(NSVGrasterizer* r, NSVGshape* shape, float sx, float sy)
{
int i, j;
NSVGpath* path;
@@ -378,13 +393,13 @@ static void nsvg__flattenShape(NSVGrasterizer* r, NSVGshape* shape, float scale)
for (path = shape->paths; path != NULL; path = path->next) {
r->npoints = 0;
// Flatten path
- nsvg__addPathPoint(r, path->pts[0]*scale, path->pts[1]*scale, 0);
+ nsvg__addPathPoint(r, path->pts[0]*sx, path->pts[1]*sy, 0);
for (i = 0; i < path->npts-1; i += 3) {
float* p = &path->pts[i*2];
- nsvg__flattenCubicBez(r, p[0]*scale,p[1]*scale, p[2]*scale,p[3]*scale, p[4]*scale,p[5]*scale, p[6]*scale,p[7]*scale, 0, 0);
+ nsvg__flattenCubicBez(r, p[0]*sx,p[1]*sy, p[2]*sx,p[3]*sy, p[4]*sx,p[5]*sy, p[6]*sx,p[7]*sy, 0, 0);
}
// Close path
- nsvg__addPathPoint(r, path->pts[0]*scale, path->pts[1]*scale, 0);
+ nsvg__addPathPoint(r, path->pts[0]*sx, path->pts[1]*sy, 0);
// Build edges
for (i = 0, j = r->npoints-1; i < r->npoints; j = i++)
nsvg__addEdge(r, r->points[j].x, r->points[j].y, r->points[i].x, r->points[i].y);
@@ -734,7 +749,7 @@ static void nsvg__prepareStroke(NSVGrasterizer* r, float miterLimit, int lineJoi
}
}
-static void nsvg__flattenShapeStroke(NSVGrasterizer* r, NSVGshape* shape, float scale)
+static void nsvg__flattenShapeStroke(NSVGrasterizer* r, NSVGshape* shape, float sx, float sy)
{
int i, j, closed;
NSVGpath* path;
@@ -742,15 +757,16 @@ static void nsvg__flattenShapeStroke(NSVGrasterizer* r, NSVGshape* shape, float
float miterLimit = shape->miterLimit;
int lineJoin = shape->strokeLineJoin;
int lineCap = shape->strokeLineCap;
- float lineWidth = shape->strokeWidth * scale;
+ const float sw = (sx + sy) / 2; // average scaling factor
+ const float lineWidth = shape->strokeWidth * sw; // FIXME (?)
for (path = shape->paths; path != NULL; path = path->next) {
// Flatten path
r->npoints = 0;
- nsvg__addPathPoint(r, path->pts[0]*scale, path->pts[1]*scale, NSVG_PT_CORNER);
+ nsvg__addPathPoint(r, path->pts[0]*sx, path->pts[1]*sy, NSVG_PT_CORNER);
for (i = 0; i < path->npts-1; i += 3) {
float* p = &path->pts[i*2];
- nsvg__flattenCubicBez(r, p[0]*scale,p[1]*scale, p[2]*scale,p[3]*scale, p[4]*scale,p[5]*scale, p[6]*scale,p[7]*scale, 0, NSVG_PT_CORNER);
+ nsvg__flattenCubicBez(r, p[0]*sx,p[1]*sy, p[2]*sx,p[3]*sy, p[4]*sx,p[5]*sy, p[6]*sx,p[7]*sy, 0, NSVG_PT_CORNER);
}
if (r->npoints < 2)
continue;
@@ -796,7 +812,7 @@ static void nsvg__flattenShapeStroke(NSVGrasterizer* r, NSVGshape* shape, float
dashOffset -= shape->strokeDashArray[idash];
idash = (idash + 1) % shape->strokeDashCount;
}
- dashLen = (shape->strokeDashArray[idash] - dashOffset) * scale;
+ dashLen = (shape->strokeDashArray[idash] - dashOffset) * sw;
for (j = 1; j < r->npoints2; ) {
float dx = r->points2[j].x - cur.x;
@@ -818,7 +834,7 @@ static void nsvg__flattenShapeStroke(NSVGrasterizer* r, NSVGshape* shape, float
// Advance dash pattern
dashState = !dashState;
idash = (idash+1) % shape->strokeDashCount;
- dashLen = shape->strokeDashArray[idash] * scale;
+ dashLen = shape->strokeDashArray[idash] * sw;
// Restart
cur.x = x;
cur.y = y;
@@ -987,7 +1003,7 @@ static inline int nsvg__div255(int x)
}
static void nsvg__scanlineSolid(unsigned char* dst, int count, unsigned char* cover, int x, int y,
- float tx, float ty, float scale, NSVGcachedPaint* cache)
+ float tx, float ty, float sx, float sy, NSVGcachedPaint* cache)
{
if (cache->type == NSVG_PAINT_COLOR) {
@@ -1028,9 +1044,9 @@ static void nsvg__scanlineSolid(unsigned char* dst, int count, unsigned char* co
int i, cr, cg, cb, ca;
unsigned int c;
- fx = ((float)x - tx) / scale;
- fy = ((float)y - ty) / scale;
- dx = 1.0f / scale;
+ fx = ((float)x - tx) / sx;
+ fy = ((float)y - ty) / sy;
+ dx = 1.0f / sx;
for (i = 0; i < count; i++) {
int r,g,b,a,ia;
@@ -1073,9 +1089,9 @@ static void nsvg__scanlineSolid(unsigned char* dst, int count, unsigned char* co
int i, cr, cg, cb, ca;
unsigned int c;
- fx = ((float)x - tx) / scale;
- fy = ((float)y - ty) / scale;
- dx = 1.0f / scale;
+ fx = ((float)x - tx) / sx;
+ fy = ((float)y - ty) / sy;
+ dx = 1.0f / sx;
for (i = 0; i < count; i++) {
int r,g,b,a,ia;
@@ -1114,7 +1130,7 @@ static void nsvg__scanlineSolid(unsigned char* dst, int count, unsigned char* co
}
}
-static void nsvg__rasterizeSortedEdges(NSVGrasterizer *r, float tx, float ty, float scale, NSVGcachedPaint* cache, char fillRule)
+static void nsvg__rasterizeSortedEdges(NSVGrasterizer *r, float tx, float ty, float sx, float sy, NSVGcachedPaint* cache, char fillRule)
{
NSVGactiveEdge *active = NULL;
int y, s;
@@ -1196,7 +1212,7 @@ static void nsvg__rasterizeSortedEdges(NSVGrasterizer *r, float tx, float ty, fl
if (xmin < 0) xmin = 0;
if (xmax > r->width-1) xmax = r->width-1;
if (xmin <= xmax) {
- nsvg__scanlineSolid(&r->bitmap[y * r->stride] + xmin*4, xmax-xmin+1, &r->scanline[xmin], xmin, y, tx,ty, scale, cache);
+ nsvg__scanlineSolid(&r->bitmap[y * r->stride] + xmin*4, xmax-xmin+1, &r->scanline[xmin], xmin, y, tx,ty, sx, sy, cache);
}
}
@@ -1364,8 +1380,9 @@ static void dumpEdges(NSVGrasterizer* r, const char* name)
}
*/
-void nsvgRasterize(NSVGrasterizer* r,
- NSVGimage* image, float tx, float ty, float scale,
+void nsvgRasterizeXY(NSVGrasterizer* r,
+ NSVGimage* image, float tx, float ty,
+ float sx, float sy,
unsigned char* dst, int w, int h, int stride)
{
NSVGshape *shape = NULL;
@@ -1396,7 +1413,7 @@ void nsvgRasterize(NSVGrasterizer* r,
r->freelist = NULL;
r->nedges = 0;
- nsvg__flattenShape(r, shape, scale);
+ nsvg__flattenShape(r, shape, sx, sy);
// Scale and translate edges
for (i = 0; i < r->nedges; i++) {
@@ -1414,14 +1431,14 @@ void nsvgRasterize(NSVGrasterizer* r,
// now, traverse the scanlines and find the intersections on each scanline, use non-zero rule
nsvg__initPaint(&cache, &shape->fill, shape->opacity);
- nsvg__rasterizeSortedEdges(r, tx,ty,scale, &cache, shape->fillRule);
+ nsvg__rasterizeSortedEdges(r, tx,ty, sx, sy, &cache, shape->fillRule);
}
- if (shape->stroke.type != NSVG_PAINT_NONE && (shape->strokeWidth * scale) > 0.01f) {
+ if (shape->stroke.type != NSVG_PAINT_NONE && (shape->strokeWidth * sx) > 0.01f) {
nsvg__resetPool(r);
r->freelist = NULL;
r->nedges = 0;
- nsvg__flattenShapeStroke(r, shape, scale);
+ nsvg__flattenShapeStroke(r, shape, sx, sy);
// dumpEdges(r, "edge.svg");
@@ -1441,7 +1458,7 @@ void nsvgRasterize(NSVGrasterizer* r,
// now, traverse the scanlines and find the intersections on each scanline, use non-zero rule
nsvg__initPaint(&cache, &shape->stroke, shape->opacity);
- nsvg__rasterizeSortedEdges(r, tx,ty,scale, &cache, NSVG_FILLRULE_NONZERO);
+ nsvg__rasterizeSortedEdges(r, tx,ty,sx, sy, &cache, NSVG_FILLRULE_NONZERO);
}
}
@@ -1453,6 +1470,13 @@ void nsvgRasterize(NSVGrasterizer* r,
r->stride = 0;
}
+void nsvgRasterize(NSVGrasterizer* r,
+ NSVGimage* image, float tx, float ty, float scale,
+ unsigned char* dst, int w, int h, int stride)
+{
+ nsvgRasterizeXY(r,image, tx, ty, scale, scale, dst, w, h, stride);
+}
+
#endif // NANOSVGRAST_IMPLEMENTATION
#endif // NANOSVGRAST_H
|