Add fix for alpha '%' parsing

Author: pranav1344

src/color.cc

@@ -226,7 +226,16 @@ parse_clipped_percentage(const char** pStr, float *pFraction) {
 
 #define ALPHA(NAME) \
     if (*str >= '1' && *str <= '9') { \
-      NAME = 1; \
+      NAME = 0; \
+      float n = .1f; \
+      while(*str >='0' && *str <= '9') { \
+        NAME += (*str - '0') * n; \
+        str++; \
+      } \
+      while(*str == ' ')str++; \
+      if(*str != '%') { \
+        NAME = 1; \
+      } \
     } else { \
       if ('0' == *str) { \
         NAME = 0; \

test/canvas.test.js

@@ -213,6 +213,17 @@ describe('Canvas', function () {
     ctx.fillStyle = 'rgba(124, 58, 26, 0)';
     assert.equal('rgba(124, 58, 26, 0.00)', ctx.fillStyle);
 
+    ctx.fillStyle = 'rgba( 255, 200, 90, 40%)'
+    assert.equal('rgba(255, 200, 90, 0.40)', ctx.fillStyle)
+
+    ctx.fillStyle = 'rgba( 255, 200, 90, 50 %)'
+    assert.equal('rgba(255, 200, 90, 0.50)', ctx.fillStyle)
+
+    ctx.fillStyle = 'rgba( 255, 200, 90, 10%)'
+    assert.equal('rgba(255, 200, 90, 0.10)', ctx.fillStyle)
+
+    ctx.fillStyle = 'rgba( 255, 200, 90, 10 %)'
+    assert.equal('rgba(255, 200, 90, 0.10)', ctx.fillStyle)
     // hsl / hsla tests
 
     ctx.fillStyle = 'hsl(0, 0%, 0%)'