[Bf-blender-cvs] [11423f922bc] soc-2019-npr: Gpencil: svg callbacks.

[YimingWu]

Commit: 11423f922bcc281b196e89c9cb600e75c8438765
Author: YimingWu
Date:   Tue Jul 9 14:47:58 2019 +0800
Branches: soc-2019-npr
https://developer.blender.org/rB11423f922bcc281b196e89c9cb600e75c8438765

Gpencil: svg callbacks.

===================================================================

M	source/blender/blenkernel/intern/writesvg.c

===================================================================

diff --git a/source/blender/blenkernel/intern/writesvg.c b/source/blender/blenkernel/intern/writesvg.c
index ca8cc037d94..4f6c46c8149 100644
--- a/source/blender/blenkernel/intern/writesvg.c
+++ b/source/blender/blenkernel/intern/writesvg.c
@@ -25,8 +25,10 @@
 #include "BLI_string.h"
 #include "BLI_string_utils.h"
 #include "BLI_listbase.h"
+#include "BLI_math.h"
 
 #include "BKE_text.h"
+#include "BKE_gpencil.h"
 
 #include "DNA_object_types.h"
 #include "DNA_gpencil_types.h"
@@ -48,23 +50,111 @@ static void write_svg_end(Text* ta){
     BKE_text_write(ta, NULL, "</svg>");
 }
 
-typedef int (svg_get_node_callback)(void* container, float *x, float *y, float *z);
+typedef int (svg_get_path_callback)(void* reader, float* fill_rgba, float* stroke_rgba, float* stroke_width);
+typedef int (svg_get_node_callback)(void* reader, float *x, float *y);
 
-static void write_path_from_callback(Text* ta, svg_get_node_callback get_node){
+#define FAC_255_COLOR3(color) ((int)(255*color[0])),((int)(255*color[1])),((int)(255*color[2]))
+
+static void write_paths_from_callback(void* reader, Text* ta, svg_get_path_callback get_path, svg_get_node_callback get_node){
+    int status;
+    float fill_color[3], stroke_color[3], stroke_width;
+    int fill_color_i[3], stroke_color_i[3];
+    float x,y;
+    char buf[128];
+    int first_in;
+    while(get_path(reader,fill_color,stroke_color,&stroke_width)){
+
+        /* beginning of a path item */
+        BKE_text_write(ta, NULL, "<path d=\"");
+        
+        first_in = 1;
+        while(get_node(reader,&x,&y)){
+            sprintf(buf,"%c %f %f\n",first_in?'M':'L',x,y);
+            BKE_text_write(ta, NULL, buf);
+            first_in = 0;
+        }
+
+        CLAMP3(fill_color,0,1);
+        CLAMP3(stroke_color,0,1);
+
+        /* end the path */
+        sprintf(buf,"\" fill=#%X%X%X; stroke=#%X%X%X; stroke-width=\"%f\" />\n",
+            FAC_255_COLOR3(fill_color), FAC_255_COLOR3(stroke_color), stroke_width);
+    }
+    
+}
+
+typedef struct GPencilSVGReader{
+    bGPdata* gpd;
+    bGPDlayer* layer;
+    bGPDframe* frame;
+    bGPDstroke* stroke;
+    bGPDspoint* point;
+    int point_i;
+}GPencilSVGReader;
+
+static int svg_gpencil_get_path_callback(GPencilSVGReader* reader, float* fill_color, float* stroke_color, float* stroke_width){
+    GPencilSVGReader* sr = (GPencilSVGReader*)reader;
+    if(!sr->stroke){
+        if(!sr->frame->strokes.first){
+            return 0;
+        }
+    }else{
+        sr->stroke = sr->stroke->next;
+        if(!sr->frame->strokes.first){
+            return 0;
+        }
+    }
+    sr->stroke = sr->frame->strokes.first;
+    *stroke_width = sr->stroke->thickness;
     
+    /* TODO: no material access yet */
+    zero_v3(fill_color);
+    zero_v3(stroke_color);
+    return 1;
+}
+
+static int svg_gpencil_get_node_callback(GPencilSVGReader* reader, float* x, float* y){
+    GPencilSVGReader* sr = (GPencilSVGReader*)reader;
+    if(!sr->point){
+        if(!sr->stroke->points){
+            return 0;
+        }
+        sr->point = sr->stroke->points;
+        sr->point_i = 0;
+    }else{
+        if(sr->point_i == sr->stroke->totpoints){
+            return 0;
+        }
+    }
+    *x = sr->point[sr->point_i].x;
+    *y = sr->point[sr->point_i].y;
+    sr->point_i++;
+    return 1;
 }
 
-bool BKE_svg_data_from_gpencil(bGPdata* gpd, Text* ta){
-    if(!gpd || !ta){
+bool BKE_svg_data_from_gpencil(bGPdata* gpd, Text* ta, bGPDlayer* layer, int frame){
+    if(!gpd || !ta || !gpd->layers.first){
         return false;
     }
     
     BKE_text_free_lines(ta);
 
-    {
-        
-        // export paths.
+    write_svg_head(ta);
 
+    /* Init temp reader */
+    GPencilSVGReader gsr = {0};
+    gsr.gpd = gpd;
+    if(layer){
+        gsr.layer = layer;
+    }else{
+        gsr.layer = gpd->layers.first;
     }
+    gsr.frame = BKE_gpencil_layer_getframe(gsr.layer,frame,0);
+
+    write_paths_from_callback(ta, &gsr, svg_gpencil_get_path_callback,svg_gpencil_get_node_callback);
+
+    write_svg_end(ta);
+
     return true;
 }