implement some so we can test it

experimental/sk_surface.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
 #include "sk_surface.h"
 
 #include "SkCanvas.h"
 #include "SkImage.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 #include "SkPath.h"
 #include "SkSurface.h"
 
-void sk_matrix_set_identity(sk_matrix_t* cmatrix) {
-    sk_bzero(cmatrix->mat, sizeof(9 * sizeof(float)));
-    cmatrix->mat[0] = cmatrix->mat[4] = cmatrix->mat[8] = 1;
-}
-
-static SkImageInfo make(const sk_image_info& cinfo) {
+static SkImageInfo make(const sk_imageinfo_t& cinfo) {
     return SkImageInfo::Make(cinfo.width, cinfo.height,
                              (SkColorType)cinfo.colorType, (SkAlphaType)cinfo.alphaType);
 }
 
-static const SkRect& AsRect(const sk_rect_t& crect) { return static_cast<const SkRect&>(crect); }
+static const SkRect& AsRect(const sk_rect_t& crect) {
+    return reinterpret_cast<const SkRect&>(crect);
+}
+
+static const SkPath& AsPath(const sk_path_t& cpath) {
+    return reinterpret_cast<const SkPath&>(cpath);
+}
+
+static const SkImage* AsImage(const sk_image_t* cimage) {
+    return reinterpret_cast<const SkImage*>(cimage);
+}
 
 static const SkPaint& AsPaint(const sk_paint_t& cpaint) {
-    return static_cast<const SkPaint&>(cpaint);
+    return reinterpret_cast<const SkPaint&>(cpaint);
 }
 
 static const SkPaint* AsPaint(const sk_paint_t* cpaint) {
-    return static_cast<const SkPaint*>(cpaint);
+    return reinterpret_cast<const SkPaint*>(cpaint);
 }
 
-static SkCanvas* AsCanvas(sk_canvas_t* ccanvas) { return static_cast<SkCanvas*>(ccanvas); }
+static SkPaint* AsPaint(sk_paint_t* cpaint) {
+    return reinterpret_cast<SkPaint*>(cpaint);
+}
+
+static SkCanvas* AsCanvas(sk_canvas_t* ccanvas) {
+    return reinterpret_cast<SkCanvas*>(ccanvas);
+}
 
 ///////////////////////////////////////////////////////////////////////////////////////////
 
+sk_image_t* sk_image_new_raster_copy(const sk_imageinfo_t* cinfo, const void* pixels,
+                                     size_t rowBytes) {
+    return (sk_image_t*)SkImage::NewRasterCopy(make(*cinfo), pixels, rowBytes);
+}
+
+void sk_image_ref(const sk_image_t* cimage) {
+    AsImage(cimage)->ref();
+}
+
+void sk_image_unref(const sk_image_t* cimage) {
+    AsImage(cimage)->unref();
+}
+
+int sk_image_get_width(const sk_image_t* cimage) {
+    return AsImage(cimage)->width();
+}
+
+int sk_image_get_height(const sk_image_t* cimage) {
+    return AsImage(cimage)->height();
+}
+
+uint32_t sk_image_get_unique_id(const sk_image_t* cimage) {
+    return AsImage(cimage)->uniqueID();
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////
+
+sk_paint_t* sk_paint_new() {
+    return (sk_paint_t*)SkNEW(SkPaint);
+}
+
+void sk_paint_delete(sk_paint_t* cpaint) {
+    SkDELETE(AsPaint(cpaint));
+}
+
+bool sk_paint_is_antialias(const sk_paint_t* cpaint) {
+    return AsPaint(*cpaint).isAntiAlias();
+}
+
+void sk_paint_set_antialias(sk_paint_t* cpaint, bool aa) {
+    AsPaint(cpaint)->setAntiAlias(aa);
+}
+
+sk_color_t sk_paint_get_color(const sk_paint_t* cpaint) {
+    return AsPaint(*cpaint).getColor();
+}
+
+void sk_paint_set_color(sk_paint_t* cpaint, sk_color_t c) {
+    AsPaint(cpaint)->setColor(c);
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////
+
 void sk_canvas_save(sk_canvas_t* ccanvas) {
     AsCanvas(ccanvas)->save();
 }
 
 void sk_canvas_save_layer(sk_canvas_t* ccanvas, const sk_rect_t* crect, const sk_paint_t* cpaint) {
     AsCanvas(ccanvas)->drawRect(AsRect(*crect), AsPaint(*cpaint));
 }
 
 void sk_canvas_restore(sk_canvas_t* ccanvas) {
     AsCanvas(ccanvas)->restore();
 }
 
 void sk_canvas_translate(sk_canvas_t* ccanvas, float dx, float dy) {
     AsCanvas(ccanvas)->translate(dx, dy);
 }
 
 void sk_canvas_scale(sk_canvas_t* ccanvas, float sx, float sy) {
-    AsCanvas(ccanvas)->scale(dx, dy);
-}
-
-void sk_canvas_concat(sk_canvas_t* ccanvas, const sk_matrix_t* cmatrix) {
-    AsCanvas(ccanvas)->concat(AsMatrix(*cmatrix));
+    AsCanvas(ccanvas)->scale(sx, sy);
 }
 
 void sk_canvas_draw_paint(sk_canvas_t* ccanvas, const sk_paint_t* cpaint) {
     AsCanvas(ccanvas)->drawPaint(AsPaint(*cpaint));
 }
 
 void sk_canvas_draw_rect(sk_canvas_t* ccanvas, const sk_rect_t* crect, const sk_paint_t* cpaint) {
     AsCanvas(ccanvas)->drawRect(AsRect(*crect), AsPaint(*cpaint));
 }
 
 void sk_canvas_draw_oval(sk_canvas_t* ccanvas, const sk_rect_t* crect, const sk_paint_t* cpaint) {
     AsCanvas(ccanvas)->drawOval(AsRect(*crect), AsPaint(*cpaint));
 }
 
 void sk_canvas_draw_path(sk_canvas_t* ccanvas, const sk_path_t* cpath, const sk_paint_t* cpaint) {
     AsCanvas(ccanvas)->drawPath(AsPath(*cpath), AsPaint(*cpaint));
 }
 
 void sk_canvas_draw_image(sk_canvas_t* ccanvas, const sk_image_t* cimage, float x, float y,
                           const sk_paint_t* cpaint) {
     AsCanvas(ccanvas)->drawImage(AsImage(cimage), x, y, AsPaint(cpaint));
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////
 
-sk_image_t* sk_image_new_raster_copy(const sk_image_info_t* cinfo, const void* pixels,
-                                     size_t rowBytes) {
-    return (sk_image_t*)SkImage::NewRasterCopy(make(*cinfo), pixels, rowBytes);
-}
-
-int sk_image_get_width(const sk_image_t* cimage) {
-    return ((const SkImage*)cimage)->width();
-}
-
-int sk_image_get_height(const sk_image_t* cimage) {
-    return ((const SkImage*)cimage)->height();
-}
-
-uint32_t sk_image_get_unique_id(const sk_image_t* cimage) {
-    return ((const SkImage*)cimage)->uniqueID();
-}
-
-///////////////////////////////////////////////////////////////////////////////////////////
-
-sk_surface_t* sk_surface_new_raster(const sk_image_info_t* cinfo) {
+sk_surface_t* sk_surface_new_raster(const sk_imageinfo_t* cinfo) {
     return (sk_surface_t*)SkSurface::NewRaster(make(*cinfo));
 }
 
-sk_surface_t* sk_surface_new_raster_direct(const sk_image_info_t* cinfo, void* pixels,
+sk_surface_t* sk_surface_new_raster_direct(const sk_imageinfo_t* cinfo, void* pixels,
                                            size_t rowBytes) {
     return (sk_surface_t*)SkSurface::NewRasterDirect(make(*cinfo), pixels, rowBytes);
 }
 
 void sk_surface_delete(sk_surface_t* csurf) {
     SkSurface* surf = (SkSurface*)csurf;
     SkSafeUnref(surf);
 }
 
 sk_canvas_t* sk_surface_get_canvas(sk_surface_t* csurf) {
     SkSurface* surf = (SkSurface*)csurf;
-    return surf->getCanvas();
+    return (sk_canvas_t*)surf->getCanvas();
 }
 
 sk_image_t* sk_surface_new_image_snapshot(sk_surface_t* csurf) {
     SkSurface* surf = (SkSurface*)csurf;
-    return surf->newImageSnapshot();
+    return (sk_image_t*)surf->newImageSnapshot();
 }
 
 
+///////////////////
+
+void sk_test_capi(SkCanvas* canvas) {
+    sk_imageinfo_t cinfo;
+    cinfo.width = 100;
+    cinfo.height = 100;
+    cinfo.colorType = (sk_colortype_t)kN32_SkColorType;
+    cinfo.alphaType = (sk_alphatype_t)kPremul_SkAlphaType;
+    
+    sk_surface_t* csurface = sk_surface_new_raster(&cinfo);
+    sk_canvas_t* ccanvas = sk_surface_get_canvas(csurface);
+    
+    sk_paint_t* cpaint = sk_paint_new();
+    sk_paint_set_antialias(cpaint, true);
+    sk_paint_set_color(cpaint, 0xFFFF0000);
+    
+    sk_rect_t cr = { 5, 5, 95, 95 };
+    sk_canvas_draw_oval(ccanvas, &cr, cpaint);
+    
+    cr.left += 25;
+    cr.top += 25;
+    cr.right -= 25;
+    cr.bottom -= 25;
+    sk_paint_set_color(cpaint, 0xFF00FF00);
+    sk_canvas_draw_rect(ccanvas, &cr, cpaint);
+    
+    sk_image_t* cimage = sk_surface_new_image_snapshot(csurface);
+    
+    // HERE WE CROSS THE C..C++ boundary
+    canvas->drawImage((const SkImage*)cimage, 20, 20, NULL);
+    
+    sk_paint_delete(cpaint);
+    sk_image_unref(cimage);
+    sk_surface_delete(csurface);
+}