implementing color parser

src/CanvasRenderingContext2d.cc

@@ -17,16 +17,6 @@
 
 Persistent<FunctionTemplate> Context2d::constructor;
 
-/*
- * Set RGBA.
- */
-
-#define RGBA(_,R,G,B,A) \
-  _.r = R / 255 * 1; \
-  _.g = G / 255 * 1; \
-  _.b = B / 255 * 1; \
-  _.a = A; \
-
 /*
  * Rectangle arg assertions.
  */
@@ -132,9 +122,11 @@ Context2d::Context2d(Canvas *canvas) {
   state->globalAlpha = 1;
   state->textAlignment = -1;
   state->fillPattern = state->strokePattern = NULL;
-  RGBA(state->fill,0,0,0,1);
+  rgba_t transparent = { 0,0,0,1 };
-  RGBA(state->stroke,0,0,0,1);
+  rgba_t transparent_black = { 0,0,0,0 };
-  RGBA(state->shadow,0,0,0,0);
+  state->fill = transparent;
+  state->stroke = transparent;
+  state->shadow = transparent_black;
 }
 
 /*
@@ -1003,9 +995,12 @@ Context2d::SetStrokePattern(const Arguments &args) {
 Handle<Value>
 Context2d::SetShadowColor(const Arguments &args) {
   HandleScope scope;
-  RGBA_ARGS(0);
+  if (!args[0]->IsString()) return Undefined();
+  String::AsciiValue str(args[0]);
+  uint32_t rgba = rgba_from_string(*str);
+  if (!rgba) return Undefined();
   Context2d *context = ObjectWrap::Unwrap<Context2d>(args.This());
-  RGBA(context->state->shadow,r,g,b,a);
+  context->state->shadow = rgba_create(rgba);
   return Undefined();
 }
 
@@ -1018,10 +1013,11 @@ Context2d::SetFillColor(const Arguments &args) {
   HandleScope scope;
   if (!args[0]->IsString()) return Undefined();
   String::AsciiValue str(args[0]);
-  rgba_t color = rgba_create(rgba_from_string(*str));
+  uint32_t rgba = rgba_from_string(*str);
+  if (!rgba) return Undefined();
   Context2d *context = ObjectWrap::Unwrap<Context2d>(args.This());
   context->state->fillPattern = NULL;
-  //RGBA(context->state->fill,r,g,b,a);
+  context->state->fill = rgba_create(rgba);
   return Undefined();
 }
 
@@ -1032,10 +1028,13 @@ Context2d::SetFillColor(const Arguments &args) {
 Handle<Value>
 Context2d::SetStrokeColor(const Arguments &args) {
   HandleScope scope;
-  RGBA_ARGS(0);
+  if (!args[0]->IsString()) return Undefined();
+  String::AsciiValue str(args[0]);
+  uint32_t rgba = rgba_from_string(*str);
+  if (!rgba) return Undefined();
   Context2d *context = ObjectWrap::Unwrap<Context2d>(args.This());
   context->state->strokePattern = NULL;
-  RGBA(context->state->stroke,r,g,b,a);
+  context->state->stroke = rgba_create(rgba);
   return Undefined();
 }
 

src/color.cc

@@ -25,7 +25,7 @@
        NAME += *str++ - '0'; \
      } while (*str >= '0' && *str <= '9'); \
    } else { \
-     return -1; \
+     return 0; \
    } \
    while (' ' == *str || ',' == *str) str++;
 
@@ -227,10 +227,10 @@ h(char c) {
 rgba_t
 rgba_create(uint32_t rgba) {
   rgba_t color;
-  color.r = rgba >> 24;
+  color.r = (double) (rgba >> 24) / 255;
-  color.g = (rgba & 0x00ff0000) >> 16;
+  color.g = (double) ((rgba & 0x00ff0000) >> 16) / 255;
-  color.b = (rgba & 0x0000ff00) >> 8;
+  color.b = (double) ((rgba & 0x0000ff00) >> 8) / 255;
-  color.a = rgba & 0xff;
+  color.a = (double) (rgba & 0xff) / 255;
   return color;
 }
 
@@ -297,7 +297,7 @@ rgba_from_rgb_string(const char *str) {
     CHANNEL(b);
     return rgba_from_rgb(r, g, b);
   }
-  return -1;
+  return 0;
 }
 
 /*
@@ -330,7 +330,7 @@ rgba_from_rgba_string(const char *str) {
     }
     return rgba_from_rgba(r, g, b, a * 255);
   }
-  return -1;
+  return 0;
 }
 
 /*
@@ -346,7 +346,7 @@ rgba_from_hex_string(const char *str) {
   size_t len = strlen(str);
   if (6 == len) return rgba_from_hex6_string(str);
   if (3 == len) return rgba_from_hex3_string(str);
-  return -1;
+  return 0;
 }
 
 /*
@@ -361,7 +361,7 @@ rgba_from_name_string(const char *str) {
     if (*str == *color.name && 0 == strcmp(str, color.name))
       return color.val;
   }
-  return -1;
+  return 0;
 }
 
 /*