[aseprite] 37/51: Fix 'outline' convolution matrices for rendered text

[Tobias Hansen]

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thansen pushed a commit to branch master
in repository aseprite.

commit 71321dfc82ff354a0e0dfe639521e0e76bfa0c28
Author: David Capello <davidcapello at gmail.com>
Date:   Fri Jul 1 19:07:01 2016 -0300

    Fix 'outline' convolution matrices for rendered text
    
    This issue was originally reported here:
    https://twitter.com/vine2D/status/748579114265653248/
---
 src/app/util/freetype_utils.cpp | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/app/util/freetype_utils.cpp b/src/app/util/freetype_utils.cpp
index e4727c5..f8dea74 100644
--- a/src/app/util/freetype_utils.cpp
+++ b/src/app/util/freetype_utils.cpp
@@ -70,14 +70,20 @@ doc::Image* render_text(const std::string& fontfile, int fontsize,
                 }
               }
 
-              doc::put_pixel(
-                image, ximg, yimg,
-                doc::rgba_blender_normal(
-                  doc::get_pixel(image, ximg, yimg),
+              int output_alpha = MUL_UN8(doc::rgba_geta(color), alpha, t);
+              if (output_alpha) {
+                doc::color_t output_color =
                   doc::rgba(doc::rgba_getr(color),
                             doc::rgba_getg(color),
                             doc::rgba_getb(color),
-                            MUL_UN8(doc::rgba_geta(color), alpha, t))));
+                            output_alpha);
+
+                doc::put_pixel(
+                  image, ximg, yimg,
+                  doc::rgba_blender_normal(
+                    doc::get_pixel(image, ximg, yimg),
+                    output_color));
+              }
             }
           }
         });

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