Add ability to change map border

tileset.cpp

@@ -1,6 +1,112 @@
 #include "tileset.h"
 
+#include <QPainter>
+#include <QImage>
+
 Tileset::Tileset()
 {
 
 }
+
+Metatile::Metatile()
+{
+    tiles = new QList<Tile>;
+}
+
+QImage Metatile::getMetatileImage(int tile, Tileset *primaryTileset, Tileset *secondaryTileset) {
+    QImage metatile_image(16, 16, QImage::Format_RGBA8888);
+
+    Metatile* metatile = Metatile::getMetatile(tile, primaryTileset, secondaryTileset);
+    if (!metatile || !metatile->tiles) {
+        metatile_image.fill(0xffffffff);
+        return metatile_image;
+    }
+
+    Tileset* blockTileset = Metatile::getBlockTileset(tile, primaryTileset, secondaryTileset);
+    if (!blockTileset) {
+        metatile_image.fill(0xffffffff);
+        return metatile_image;
+    }
+    QList<QList<QRgb>> palettes = Metatile::getBlockPalettes(primaryTileset, secondaryTileset);
+
+    QPainter metatile_painter(&metatile_image);
+    for (int layer = 0; layer < 2; layer++)
+    for (int y = 0; y < 2; y++)
+    for (int x = 0; x < 2; x++) {
+        Tile tile_ = metatile->tiles->value((y * 2) + x + (layer * 4));
+        QImage tile_image = Metatile::getMetatileTile(tile_.tile, primaryTileset, secondaryTileset);
+        if (tile_image.isNull()) {
+            // Some metatiles specify tiles that are outside the valid range.
+            // These are treated as completely transparent, so they can be skipped without
+            // being drawn.
+            continue;
+        }
+
+        // Colorize the metatile tiles with its palette.
+        QList<QRgb> palette = palettes.value(tile_.palette);
+        for (int j = 0; j < palette.length(); j++) {
+            tile_image.setColor(j, palette.value(j));
+        }
+
+        // The top layer of the metatile has its last color displayed at transparent.
+        if (layer > 0) {
+            QColor color(tile_image.color(15));
+            color.setAlpha(0);
+            tile_image.setColor(15, color.rgba());
+        }
+
+        QPoint origin = QPoint(x*8, y*8);
+        metatile_painter.drawImage(origin, tile_image.mirrored(tile_.xflip == 1, tile_.yflip == 1));
+    }
+    metatile_painter.end();
+
+    return metatile_image;
+}
+
+Metatile* Metatile::getMetatile(int index, Tileset *primaryTileset, Tileset *secondaryTileset) {
+    Tileset *tileset = Metatile::getBlockTileset(index, primaryTileset, secondaryTileset);
+    int local_index = Metatile::getBlockIndex(index);
+    if (!tileset || !tileset->metatiles) {
+        return NULL;
+    }
+    Metatile *metatile = tileset->metatiles->value(local_index, NULL);
+    return metatile;
+}
+
+QImage Metatile::getMetatileTile(int tile, Tileset *primaryTileset, Tileset *secondaryTileset) {
+    Tileset *tileset = Metatile::getBlockTileset(tile, primaryTileset, secondaryTileset);
+    int local_index = Metatile::getBlockIndex(tile);
+    if (!tileset || !tileset->tiles) {
+        return QImage();
+    }
+    return tileset->tiles->value(local_index, QImage());
+}
+
+Tileset* Metatile::getBlockTileset(int metatile_index, Tileset *primaryTileset, Tileset *secondaryTileset) {
+    int primary_size = 0x200;
+    if (metatile_index < primary_size) {
+        return primaryTileset;
+    } else {
+        return secondaryTileset;
+    }
+}
+
+int Metatile::getBlockIndex(int index) {
+    int primary_size = 0x200;
+    if (index < primary_size) {
+        return index;
+    } else {
+        return index - primary_size;
+    }
+}
+
+QList<QList<QRgb>> Metatile::getBlockPalettes(Tileset *primaryTileset, Tileset *secondaryTileset) {
+    QList<QList<QRgb>> palettes;
+    for (int i = 0; i < 6; i++) {
+        palettes.append(primaryTileset->palettes->at(i));
+    }
+    for (int i = 6; i < secondaryTileset->palettes->length(); i++) {
+        palettes.append(secondaryTileset->palettes->at(i));
+    }
+    return palettes;
+}