Support 8BPP images for 4BPP tilemaps

CHANGELOG.md

@@ -10,6 +10,7 @@ The **"Breaking Changes"** listed below are changes that have been made in the d
 ### Fixed
 - Fix events being hidden behind connecting maps.
 - Fix some minor visual issues on the Connections tab.
+- Fix the updated pokefirered region map graphics appearing in grayscale.
 
 ## [5.1.0] - 2023-01-22
 ### Added

include/ui/tilemaptileselector.h

@@ -126,6 +126,12 @@ public:
     TilemapTileSelector(QString tilesetFilepath, TilemapFormat format, QString palFilepath): SelectablePixmapItem(8, 8, 1, 1) {
         this->tileset = QImage(tilesetFilepath);
         this->format = format;
+        if (this->tileset.format() == QImage::Format::Format_Indexed8 && this->format == TilemapFormat::BPP_4) {
+            // Squash pixel data to fit 4BPP. Allows project repo to use 8BPP images for 4BPP tilemaps
+            uchar * pixel = this->tileset.bits();
+            for (int i = 0; i < this->tileset.sizeInBytes(); i++, pixel++)
+                *pixel %= 16;
+        }
         bool err;
         if (!palFilepath.isEmpty()) {
             this->palette = PaletteUtil::parse(palFilepath, &err);

src/ui/tilemaptileselector.cpp

@@ -51,8 +51,7 @@ QImage TilemapTileSelector::setPalette(int paletteIndex) {
         {
             QVector<QRgb> newColorTable;
             int palMinLength = paletteIndex * 16 + 16;
-            if ((this->palette.count() < palMinLength) || (tilesetImage.colorTable().count() != 16)) {
-                // either a) the palette has less than 256 colors, or b) the image is improperly indexed
+            if (this->palette.count() < palMinLength) {
                 for (QRgb color : tilesetImage.colorTable()) {
                     int gray = qGray(color);
                     newColorTable.append(qRgb(gray, gray, gray));