[EGIT] [efl] 01/01: use premultiplied colors on the EFL side

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commit 9375181c771317809472c60f5cd245a65e880dfc
Author: Vincent Torri <vto...@outlook.fr>
AuthorDate: Sun Sep 17 15:25:23 2023 +0200

    use premultiplied colors on the EFL side
---
 src/modules/evas/image_loaders/qoi/evas_image_load_qoi.c | 11 ++++++++++-
 src/modules/evas/image_savers/qoi/evas_image_save_qoi.c  |  6 +++---
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/modules/evas/image_loaders/qoi/evas_image_load_qoi.c b/src/modules/evas/image_loaders/qoi/evas_image_load_qoi.c
index 0cb0f24333..6f0d847429 100644
--- a/src/modules/evas/image_loaders/qoi/evas_image_load_qoi.c
+++ b/src/modules/evas/image_loaders/qoi/evas_image_load_qoi.c
@@ -262,7 +262,16 @@ evas_image_load_file_data_qoi_internal(Evas_Loader_Internal *loader EINA_UNUSED,
              index[QOI_COLOR_HASH(px) % 64] = px;
           }
 
-        *iter = ((prop->alpha ? px.rgba.a : 255) << 24) | (px.rgba.r << 16) | (px.rgba.g << 8) | px.rgba.b;
+        if (prop->alpha)
+          *iter = (px.rgba.a << 24) |
+                  (((px.rgba.r * px.rgba.a) / 255) << 16) |
+                  (((px.rgba.g * px.rgba.a) / 255) << 8) |
+                  (((px.rgba.b * px.rgba.a) / 255));
+        else
+          *iter = (255 << 24) |
+                  (px.rgba.r << 16) |
+                  (px.rgba.g << 8) |
+                  (px.rgba.b);
      }
 
    *error = EVAS_LOAD_ERROR_NONE;
diff --git a/src/modules/evas/image_savers/qoi/evas_image_save_qoi.c b/src/modules/evas/image_savers/qoi/evas_image_save_qoi.c
index 0a31d8f621..3b5a5ae716 100644
--- a/src/modules/evas/image_savers/qoi/evas_image_save_qoi.c
+++ b/src/modules/evas/image_savers/qoi/evas_image_save_qoi.c
@@ -115,10 +115,10 @@ save_image_qoi(RGBA_Image *im, const char *file, int quality EINA_UNUSED)
    iter = (unsigned char *)im->image.data;
    for (px_pos = 0; px_pos < px_len; px_pos += channels, iter +=4)
      {
-        px.rgba.b = *(iter + 0);
-        px.rgba.g = *(iter + 1);
-        px.rgba.r = *(iter + 2);
         px.rgba.a = *(iter + 3);
+        px.rgba.b = *(iter + 0) * 255 / px.rgba.a;
+        px.rgba.g = *(iter + 1) * 255 / px.rgba.a;
+        px.rgba.r = *(iter + 2) * 255 / px.rgba.a;
 
         if (px.v == px_prev.v)
           {


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