src/third_party/skia/src/c/sk_surface.cpp

   1 /*
   2  * Copyright 2014 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "sk_surface.h"
   9
  10 #include "SkCanvas.h"
  11 #include "SkImage.h"
  12 #include "SkMatrix.h"
  13 #include "SkPaint.h"
  14 #include "SkPath.h"
  15 #include "SkSurface.h"
  16
  17 const struct {
  18     sk_colortype_t  fC;
  19     SkColorType     fSK;
  20 } gColorTypeMap[] = {
  21     { UNKNOWN_SK_COLORTYPE,     kUnknown_SkColorType    },
  22     { RGBA_8888_SK_COLORTYPE,   kRGBA_8888_SkColorType  },
  23     { BGRA_8888_SK_COLORTYPE,   kBGRA_8888_SkColorType  },
  24     { ALPHA_8_SK_COLORTYPE,     kAlpha_8_SkColorType    },
  25 };
  26
  27 const struct {
  28     sk_alphatype_t  fC;
  29     SkAlphaType     fSK;
  30 } gAlphaTypeMap[] = {
  31     { OPAQUE_SK_ALPHATYPE,      kOpaque_SkAlphaType     },
  32     { PREMUL_SK_ALPHATYPE,      kPremul_SkAlphaType     },
  33     { UNPREMUL_SK_ALPHATYPE,    kUnpremul_SkAlphaType   },
  34 };
  35
  36 static bool from_c_colortype(sk_colortype_t cCT, SkColorType* skCT) {
  37     for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypeMap); ++i) {
  38         if (gColorTypeMap[i].fC == cCT) {
  39             if (skCT) {
  40                 *skCT = gColorTypeMap[i].fSK;
  41             }
  42             return true;
  43         }
  44     }
  45     return false;
  46 }
  47
  48 static bool to_c_colortype(SkColorType skCT, sk_colortype_t* cCT) {
  49     for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypeMap); ++i) {
  50         if (gColorTypeMap[i].fSK == skCT) {
  51             if (cCT) {
  52                 *cCT = gColorTypeMap[i].fC;
  53             }
  54             return true;
  55         }
  56     }
  57     return false;
  58 }
  59
  60 static bool from_c_alphatype(sk_alphatype_t cAT, SkAlphaType* skAT) {
  61     for (size_t i = 0; i < SK_ARRAY_COUNT(gAlphaTypeMap); ++i) {
  62         if (gAlphaTypeMap[i].fC == cAT) {
  63             if (skAT) {
  64                 *skAT = gAlphaTypeMap[i].fSK;
  65             }
  66             return true;
  67         }
  68     }
  69     return false;
  70 }
  71
  72 static bool from_c_info(const sk_imageinfo_t& cinfo, SkImageInfo* info) {
  73     SkColorType ct;
  74     SkAlphaType at;
  75
  76     if (!from_c_colortype(cinfo.colorType, &ct)) {
  77         // optionally report error to client?
  78         return false;
  79     }
  80     if (!from_c_alphatype(cinfo.alphaType, &at)) {
  81         // optionally report error to client?
  82         return false;
  83     }
  84     if (info) {
  85         *info = SkImageInfo::Make(cinfo.width, cinfo.height, ct, at);
  86     }
  87     return true;
  88 }
  89
  90 static const SkRect& AsRect(const sk_rect_t& crect) {
  91     return reinterpret_cast<const SkRect&>(crect);
  92 }
  93
  94 static const SkPath& AsPath(const sk_path_t& cpath) {
  95     return reinterpret_cast<const SkPath&>(cpath);
  96 }
  97
  98 static SkPath* as_path(sk_path_t* cpath) {
  99     return reinterpret_cast<SkPath*>(cpath);
 100 }
 101
 102 static const SkImage* AsImage(const sk_image_t* cimage) {
 103     return reinterpret_cast<const SkImage*>(cimage);
 104 }
 105
 106 static const SkPaint& AsPaint(const sk_paint_t& cpaint) {
 107     return reinterpret_cast<const SkPaint&>(cpaint);
 108 }
 109
 110 static const SkPaint* AsPaint(const sk_paint_t* cpaint) {
 111     return reinterpret_cast<const SkPaint*>(cpaint);
 112 }
 113
 114 static SkPaint* AsPaint(sk_paint_t* cpaint) {
 115     return reinterpret_cast<SkPaint*>(cpaint);
 116 }
 117
 118 static SkCanvas* AsCanvas(sk_canvas_t* ccanvas) {
 119     return reinterpret_cast<SkCanvas*>(ccanvas);
 120 }
 121
 122 ///////////////////////////////////////////////////////////////////////////////////////////
 123
 124 sk_colortype_t sk_colortype_get_default_8888() {
 125     sk_colortype_t ct;
 126     if (!to_c_colortype(kN32_SkColorType, &ct)) {
 127         ct = UNKNOWN_SK_COLORTYPE;
 128     }
 129     return ct;
 130 }
 131
 132 ///////////////////////////////////////////////////////////////////////////////////////////
 133
 134 sk_image_t* sk_image_new_raster_copy(const sk_imageinfo_t* cinfo, const void* pixels,
 135                                      size_t rowBytes) {
 136     SkImageInfo info;
 137     if (!from_c_info(*cinfo, &info)) {
 138         return NULL;
 139     }
 140     return (sk_image_t*)SkImage::NewRasterCopy(info, pixels, rowBytes);
 141 }
 142
 143 void sk_image_ref(const sk_image_t* cimage) {
 144     AsImage(cimage)->ref();
 145 }
 146
 147 void sk_image_unref(const sk_image_t* cimage) {
 148     AsImage(cimage)->unref();
 149 }
 150
 151 int sk_image_get_width(const sk_image_t* cimage) {
 152     return AsImage(cimage)->width();
 153 }
 154
 155 int sk_image_get_height(const sk_image_t* cimage) {
 156     return AsImage(cimage)->height();
 157 }
 158
 159 uint32_t sk_image_get_unique_id(const sk_image_t* cimage) {
 160     return AsImage(cimage)->uniqueID();
 161 }
 162
 163 ///////////////////////////////////////////////////////////////////////////////////////////
 164
 165 sk_paint_t* sk_paint_new() {
 166     return (sk_paint_t*)SkNEW(SkPaint);
 167 }
 168
 169 void sk_paint_delete(sk_paint_t* cpaint) {
 170     SkDELETE(AsPaint(cpaint));
 171 }
 172
 173 bool sk_paint_is_antialias(const sk_paint_t* cpaint) {
 174     return AsPaint(*cpaint).isAntiAlias();
 175 }
 176
 177 void sk_paint_set_antialias(sk_paint_t* cpaint, bool aa) {
 178     AsPaint(cpaint)->setAntiAlias(aa);
 179 }
 180
 181 sk_color_t sk_paint_get_color(const sk_paint_t* cpaint) {
 182     return AsPaint(*cpaint).getColor();
 183 }
 184
 185 void sk_paint_set_color(sk_paint_t* cpaint, sk_color_t c) {
 186     AsPaint(cpaint)->setColor(c);
 187 }
 188
 189 ///////////////////////////////////////////////////////////////////////////////////////////
 190
 191 sk_path_t* sk_path_new() {
 192     return (sk_path_t*)SkNEW(SkPath);
 193 }
 194
 195 void sk_path_delete(sk_path_t* cpath) {
 196     SkDELETE(as_path(cpath));
 197 }
 198
 199 void sk_path_move_to(sk_path_t* cpath, float x, float y) {
 200     as_path(cpath)->moveTo(x, y);
 201 }
 202
 203 void sk_path_line_to(sk_path_t* cpath, float x, float y) {
 204     as_path(cpath)->lineTo(x, y);
 205 }
 206
 207 void sk_path_quad_to(sk_path_t* cpath, float x0, float y0, float x1, float y1) {
 208     as_path(cpath)->quadTo(x0, y0, x1, y1);
 209 }
 210
 211 void sk_path_close(sk_path_t* cpath) {
 212     as_path(cpath)->close();
 213 }
 214
 215 ///////////////////////////////////////////////////////////////////////////////////////////
 216
 217 void sk_canvas_save(sk_canvas_t* ccanvas) {
 218     AsCanvas(ccanvas)->save();
 219 }
 220
 221 void sk_canvas_save_layer(sk_canvas_t* ccanvas, const sk_rect_t* crect, const sk_paint_t* cpaint) {
 222     AsCanvas(ccanvas)->drawRect(AsRect(*crect), AsPaint(*cpaint));
 223 }
 224
 225 void sk_canvas_restore(sk_canvas_t* ccanvas) {
 226     AsCanvas(ccanvas)->restore();
 227 }
 228
 229 void sk_canvas_translate(sk_canvas_t* ccanvas, float dx, float dy) {
 230     AsCanvas(ccanvas)->translate(dx, dy);
 231 }
 232
 233 void sk_canvas_scale(sk_canvas_t* ccanvas, float sx, float sy) {
 234     AsCanvas(ccanvas)->scale(sx, sy);
 235 }
 236
 237 void sk_canvas_draw_paint(sk_canvas_t* ccanvas, const sk_paint_t* cpaint) {
 238     AsCanvas(ccanvas)->drawPaint(AsPaint(*cpaint));
 239 }
 240
 241 void sk_canvas_draw_rect(sk_canvas_t* ccanvas, const sk_rect_t* crect, const sk_paint_t* cpaint) {
 242     AsCanvas(ccanvas)->drawRect(AsRect(*crect), AsPaint(*cpaint));
 243 }
 244
 245 void sk_canvas_draw_oval(sk_canvas_t* ccanvas, const sk_rect_t* crect, const sk_paint_t* cpaint) {
 246     AsCanvas(ccanvas)->drawOval(AsRect(*crect), AsPaint(*cpaint));
 247 }
 248
 249 void sk_canvas_draw_path(sk_canvas_t* ccanvas, const sk_path_t* cpath, const sk_paint_t* cpaint) {
 250     AsCanvas(ccanvas)->drawPath(AsPath(*cpath), AsPaint(*cpaint));
 251 }
 252
 253 void sk_canvas_draw_image(sk_canvas_t* ccanvas, const sk_image_t* cimage, float x, float y,
 254                           const sk_paint_t* cpaint) {
 255     AsCanvas(ccanvas)->drawImage(AsImage(cimage), x, y, AsPaint(cpaint));
 256 }
 257
 258 ///////////////////////////////////////////////////////////////////////////////////////////
 259
 260 sk_surface_t* sk_surface_new_raster(const sk_imageinfo_t* cinfo) {
 261     SkImageInfo info;
 262     if (!from_c_info(*cinfo, &info)) {
 263         return NULL;
 264     }
 265     return (sk_surface_t*)SkSurface::NewRaster(info);
 266 }
 267
 268 sk_surface_t* sk_surface_new_raster_direct(const sk_imageinfo_t* cinfo, void* pixels,
 269                                            size_t rowBytes) {
 270     SkImageInfo info;
 271     if (!from_c_info(*cinfo, &info)) {
 272         return NULL;
 273     }
 274     return (sk_surface_t*)SkSurface::NewRasterDirect(info, pixels, rowBytes);
 275 }
 276
 277 void sk_surface_delete(sk_surface_t* csurf) {
 278     SkSurface* surf = (SkSurface*)csurf;
 279     SkSafeUnref(surf);
 280 }
 281
 282 sk_canvas_t* sk_surface_get_canvas(sk_surface_t* csurf) {
 283     SkSurface* surf = (SkSurface*)csurf;
 284     return (sk_canvas_t*)surf->getCanvas();
 285 }
 286
 287 sk_image_t* sk_surface_new_image_snapshot(sk_surface_t* csurf) {
 288     SkSurface* surf = (SkSurface*)csurf;
 289     return (sk_image_t*)surf->newImageSnapshot();
 290 }
 291
 292
 293 ///////////////////
 294
 295 void sk_test_capi(SkCanvas* canvas) {
 296     sk_imageinfo_t cinfo;
 297     cinfo.width = 100;
 298     cinfo.height = 100;
 299     cinfo.colorType = (sk_colortype_t)kN32_SkColorType;
 300     cinfo.alphaType = (sk_alphatype_t)kPremul_SkAlphaType;
 301
 302     sk_surface_t* csurface = sk_surface_new_raster(&cinfo);
 303     sk_canvas_t* ccanvas = sk_surface_get_canvas(csurface);
 304
 305     sk_paint_t* cpaint = sk_paint_new();
 306     sk_paint_set_antialias(cpaint, true);
 307     sk_paint_set_color(cpaint, 0xFFFF0000);
 308
 309     sk_rect_t cr = { 5, 5, 95, 95 };
 310     sk_canvas_draw_oval(ccanvas, &cr, cpaint);
 311
 312     cr.left += 25;
 313     cr.top += 25;
 314     cr.right -= 25;
 315     cr.bottom -= 25;
 316     sk_paint_set_color(cpaint, 0xFF00FF00);
 317     sk_canvas_draw_rect(ccanvas, &cr, cpaint);
 318
 319     sk_path_t* cpath = sk_path_new();
 320     sk_path_move_to(cpath, 50, 50);
 321     sk_path_line_to(cpath, 100, 100);
 322     sk_path_line_to(cpath, 50, 100);
 323     sk_path_close(cpath);
 324
 325     sk_canvas_draw_path(ccanvas, cpath, cpaint);
 326
 327     sk_image_t* cimage = sk_surface_new_image_snapshot(csurface);
 328
 329     // HERE WE CROSS THE C..C++ boundary
 330     canvas->drawImage((const SkImage*)cimage, 20, 20, NULL);
 331
 332     sk_path_delete(cpath);
 333     sk_paint_delete(cpaint);
 334     sk_image_unref(cimage);
 335     sk_surface_delete(csurface);
 336 }