[Bf-blender-cvs] [224daf55ac6] blender2.8: Matcaps: Add AntiAlias alpha mask to icon preview.
Clément Foucault
noreply at git.blender.org
Sat Jun 16 23:28:32 CEST 2018
Commit: 224daf55ac6b3467d5e7d6ec6f992f2c714aacca
Author: Clément Foucault
Date: Sat Jun 16 22:32:58 2018 +0200
Branches: blender2.8
https://developer.blender.org/rB224daf55ac6b3467d5e7d6ec6f992f2c714aacca
Matcaps: Add AntiAlias alpha mask to icon preview.
===================================================================
M source/blender/blenkernel/intern/studiolight.c
===================================================================
diff --git a/source/blender/blenkernel/intern/studiolight.c b/source/blender/blenkernel/intern/studiolight.c
index fa55ba69858..5ea08b66ac0 100644
--- a/source/blender/blenkernel/intern/studiolight.c
+++ b/source/blender/blenkernel/intern/studiolight.c
@@ -593,6 +593,20 @@ static int studiolight_cmp(const void *a, const void *b)
}
/* icons */
+
+/* Takes normalized uvs as parameter (range from 0 to 1).
+ * inner_edge and outer_edge are distances (from the center)
+ * in uv space for the alpha mask falloff. */
+static uint alpha_circle_mask(float u, float v, float inner_edge, float outer_edge)
+{
+ /* Coords from center. */
+ float co[2] = {u - 0.5f, v - 0.5f};
+ float dist = len_v2(co);
+ float alpha = 1.0f + (inner_edge - dist) / (outer_edge - inner_edge);
+ uint mask = (uint)floorf(255.0f * min_ff(max_ff(alpha, 0.0f), 1.0f));
+ return mask << 24;
+}
+
static uint *studiolight_radiance_preview(StudioLight *sl, int icon_size)
{
BKE_studiolight_ensure_flag(sl, STUDIOLIGHT_EXTERNAL_IMAGE_LOADED);
@@ -652,22 +666,23 @@ static uint *studiolight_matcap_preview(StudioLight *sl, int icon_size, bool fli
BKE_studiolight_ensure_flag(sl, STUDIOLIGHT_EXTERNAL_IMAGE_LOADED);
uint *rect = MEM_mallocN(icon_size * icon_size * sizeof(uint), __func__);
- const uint alphamask = 0xff000000;
float color[4];
float fx, fy;
+ float pixel_size = 1.0f / (float)icon_size;
int offset = 0;
ImBuf *ibuf = sl->equirectangular_radiance_buffer;
for (int y = 0; y < icon_size; y++) {
- fy = y * ibuf->y / icon_size;
+ fy = (y + 0.5f) / (float)icon_size;
for (int x = 0; x < icon_size; x++) {
+ fx = (x + 0.5f) / (float)icon_size;
if (flipped) {
- fx = ibuf->x - (x * ibuf->x / icon_size) - 1;
+ fx = 1.0f - fx;
}
- else {
- fx = x * ibuf->x / icon_size;
- }
- nearest_interpolation_color(ibuf, NULL, color, fx, fy);
+ nearest_interpolation_color(ibuf, NULL, color, fx * ibuf->x, fy * ibuf->y);
+
+ uint alphamask = alpha_circle_mask(fx, fy, 0.5f - pixel_size, 0.5f);
+
rect[offset++] = rgb_to_cpack(
linearrgb_to_srgb(color[0]),
linearrgb_to_srgb(color[1]),
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