Improve graphlib accuracy

CMakeLists.txt

@@ -107,8 +107,6 @@ target_sources(${EXECUTABLE_NAME} PUBLIC
     "src/game_mouse.h"
     "src/game_movie.cc"
     "src/game_movie.h"
-    "src/game_palette.cc"
-    "src/game_palette.h"
     "src/game_sound.cc"
     "src/game_sound.h"
     "src/game_vars.h"
@@ -118,8 +116,6 @@ target_sources(${EXECUTABLE_NAME} PUBLIC
     "src/geometry.h"
     "src/graph_lib.cc"
     "src/graph_lib.h"
-    "src/grayscale.cc"
-    "src/grayscale.h"
     "src/heap.cc"
     "src/heap.h"
     "src/input.cc"

src/character_editor.cc

@@ -18,9 +18,9 @@
 #include "draw.h"
 #include "game.h"
 #include "game_mouse.h"
-#include "game_palette.h"
 #include "game_sound.h"
 #include "geometry.h"
+#include "graph_lib.h"
 #include "input.h"
 #include "interface.h"
 #include "item.h"
@@ -4961,7 +4961,7 @@ static int characterEditorDrawCardWithOptions(int graphicId, const char* name, c
     ptr = frmImage.getData();
     for (y = 0; y < frmImage.getHeight(); y++) {
         for (x = 0; x < frmImage.getWidth(); x++) {
-            if (_HighRGB_(*ptr) < 2 && v9 >= x) {
+            if (HighRGB(*ptr) < 2 && v9 >= x) {
                 v9 = x;
             }
             ptr++;
@@ -6659,7 +6659,7 @@ static int perkDialogDrawCard(int frmId, const char* name, const char* rank, cha
     for (int y = 0; y < frmImage.getHeight(); y++) {
         unsigned char* stride = data;
         for (int x = 0; x < frmImage.getWidth(); x++) {
-            if (_HighRGB_(*stride) < 2) {
+            if (HighRGB(*stride) < 2) {
                 if (extraDescriptionWidth > x) {
                     extraDescriptionWidth = x;
                 }

src/graph_lib.cc

@@ -2,6 +2,9 @@
 
 #include <string.h>
 
+#include <algorithm>
+
+#include "color.h"
 #include "debug.h"
 #include "memory.h"
 
@@ -11,6 +14,9 @@ static void _InitTree();
 static void _InsertNode(int a1);
 static void _DeleteNode(int a1);
 
+// 0x596D90
+static unsigned char _GreyTable[256];
+
 // 0x596E90
 static int* _dad_2;
 
@@ -35,6 +41,17 @@ static int _codesize;
 // 0x596EAC
 static int _match_position;
 
+// 0x44EBC0
+unsigned char HighRGB(unsigned char color)
+{
+    int rgb = Color2RGB(color);
+    int r = (rgb & 0x7C00) >> 10;
+    int g = (rgb & 0x3E0) >> 5;
+    int b = (rgb & 0x1F);
+
+    return std::max(std::max(r, g), b);
+}
+
 // 0x44F250
 int graphCompress(unsigned char* a1, unsigned char* a2, int a3)
 {
@@ -385,4 +402,38 @@ int graphDecompress(unsigned char* src, unsigned char* dest, int length)
     return 0;
 }
 
+// 0x44FA78
+void grayscalePaletteUpdate(int a1, int a2)
+{
+    if (a1 >= 0 && a2 <= 255) {
+        for (int index = a1; index <= a2; index++) {
+            // NOTE: The only way to explain so much calls to `Color2RGB` with
+            // the same repeated pattern is by the use of min/max macros.
+
+            int v1 = std::max((Color2RGB(index) & 0x7C00) >> 10, std::max((Color2RGB(index) & 0x3E0) >> 5, Color2RGB(index) & 0x1F));
+            int v2 = std::min((Color2RGB(index) & 0x7C00) >> 10, std::min((Color2RGB(index) & 0x3E0) >> 5, Color2RGB(index) & 0x1F));
+            int v3 = v1 + v2;
+            int v4 = (int)((double)v3 * 240.0 / 510.0);
+
+            int paletteIndex = ((v4 & 0xFF) << 10) | ((v4 & 0xFF) << 5) | (v4 & 0xFF);
+            _GreyTable[index] = _colorTable[paletteIndex];
+        }
+    }
+}
+
+// 0x44FC40
+void grayscalePaletteApply(unsigned char* buffer, int width, int height, int pitch)
+{
+    unsigned char* ptr = buffer;
+    int skip = pitch - width;
+
+    for (int y = 0; y < height; y++) {
+        for (int x = 0; x < width; x++) {
+            unsigned char c = *ptr;
+            *ptr++ = _GreyTable[c];
+        }
+        ptr += skip;
+    }
+}
+
 } // namespace fallout

src/graph_lib.h

@@ -3,8 +3,11 @@
 
 namespace fallout {
 
+unsigned char HighRGB(unsigned char color);
 int graphCompress(unsigned char* a1, unsigned char* a2, int a3);
 int graphDecompress(unsigned char* a1, unsigned char* a2, int a3);
+void grayscalePaletteUpdate(int a1, int a2);
+void grayscalePaletteApply(unsigned char* surface, int width, int height, int pitch);
 
 } // namespace fallout
 

src/options.cc

@@ -17,7 +17,7 @@
 #include "game_mouse.h"
 #include "game_sound.h"
 #include "geometry.h"
-#include "grayscale.h"
+#include "graph_lib.h"
 #include "input.h"
 #include "kb.h"
 #include "loadsave.h"