# HG changeset patch
# User Matti Hamalainen <ccr@tnsp.org>
# Date 1528484940 -10800
# Node ID 07111a60cd4e9c031c8e69f3cd934eff112d38af
# Parent  474055f25ab00eab0502d7a45abd646dbd03cef2
Add dmSetMixedColorC64Palette() for setting a 256 entry "mixed color"
palette, which consists of averaged 16 x 16 matrix of C64 palette.
This can be used for rendering images that use color interlace.

diff -r 474055f25ab0 -r 07111a60cd4e tools/lib64gfx.c
--- a/tools/lib64gfx.c	Fri Jun 08 22:07:05 2018 +0300
+++ b/tools/lib64gfx.c	Fri Jun 08 22:09:00 2018 +0300
@@ -115,6 +115,29 @@
 }
 
 
+BOOL dmSetMixedColorC64Palette(DMImage *img)
+{
+    if (!dmImagePaletteAlloc(dst, C64_NCOLORS * C64_NCOLORS, -1))
+        return FALSE;
+
+    int n = 0;
+    for (int n1 = 0; n1 < C64_NCOLORS; n1++)
+    {
+        const DMColor *col1 = &dmDefaultC64Palette[n1];
+        for (int n2 = 0; n2 < C64_NCOLORS; n2++)
+        {
+            const DMColor *col2 = &dmDefaultC64Palette[n2];
+            dst->pal[n].r = (col1->r + col2->r) / 2;
+            dst->pal[n].g = (col1->g + col2->g) / 2;
+            dst->pal[n].b = (col1->b + col2->b) / 2;
+            n++;
+        }
+    }
+
+    return TRUE;
+}
+
+
 BOOL dmCompareAddr16(const Uint8 *buf, const size_t offs, const Uint16 addr)
 {
     return buf[offs    ] == DM_GET_ADDR_LO(addr) &&
diff -r 474055f25ab0 -r 07111a60cd4e tools/lib64gfx.h
--- a/tools/lib64gfx.h	Fri Jun 08 22:07:05 2018 +0300
+++ b/tools/lib64gfx.h	Fri Jun 08 22:09:00 2018 +0300
@@ -284,6 +284,8 @@
 void      dmC64ImageDump(FILE *fh, const DMC64Image *img, const DMC64ImageFormat *fmt);
 
 void      dmSetDefaultC64Palette(DMImage *img);
+BOOL      dmSetMixedColorC64Palette(DMImage *img);
+
 BOOL      dmCompareAddr16(const Uint8 *buf, const size_t offs, const Uint16 addr);
 int       dmC64ImageGetNumBanks(const DMC64ImageFormat *fmt);