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Add sheet_offset parameter to ComposeTile16 and update sheet ID validation

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scawful
2024-11-10 11:28:51 -05:00
parent 89a8e47e9c
commit 03da9d4eaa
2 changed files with 15 additions and 5 deletions
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9
src/app/gfx/tilesheet.cc
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@@ -63,7 +63,8 @@ void Tilesheet::ComposeTile16(const std::vector<uint8_t>& graphics_buffer,
const TileInfo& top_left,
const TileInfo& top_right,
const TileInfo& bottom_left,
const TileInfo& bottom_right) {
const TileInfo& bottom_right, int sheet_offset) {
sheet_offset_ = sheet_offset;
// Calculate the base position for this Tile16 in the full-size bitmap
int tiles_per_row = bitmap_->width() / tile_width_;
int tile16_row = num_tiles_ / tiles_per_row;
@@ -123,13 +124,13 @@ std::vector<uint8_t> Tilesheet::FetchTileDataFromGraphicsBuffer(
// Calculate the position in the graphics_buffer_ based on tile_id
std::vector<uint8_t> tile_data(0x40, 0x00);
int sheet = (tile_id / tiles_per_sheet) % 4 + 212;
int sheet = (tile_id / tiles_per_sheet) % 4 + sheet_offset_;
int position_in_sheet = tile_id % tiles_per_sheet;
int row_in_sheet = position_in_sheet / tiles_per_row;
int column_in_sheet = position_in_sheet % tiles_per_row;
// Ensure that the sheet ID is between 212 and 215
assert(sheet >= 212 && sheet <= 215);
// Ensure that the sheet ID is between 212 and 215 if using full gfx buffer
assert(sheet >= sheet_offset_ && sheet <= sheet_offset_ + 3);
// Copy the tile data from the graphics_buffer_ to tile_data
for (int y = 0; y < 8; ++y) {