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Fix display of high freeform edges at north edges in viewport map mode

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Jonathan G Rennison
2021-06-20 11:18:45 +01:00
parent 2f350ff6ef
commit 9f56818ca7
1 changed files with 8 additions and 10 deletions
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18
src/viewport.cpp
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@@ -2903,25 +2903,23 @@ static inline TileIndex ViewportMapGetMostSignificantTileType(const Viewport * c
/** Get the colour of a tile, can be 32bpp RGB or 8bpp palette index. */
template <bool is_32bpp, bool show_slope>
uint32 ViewportMapGetColour(const Viewport * const vp, uint x, uint y, const uint colour_index)
uint32 ViewportMapGetColour(const Viewport * const vp, int x, int y, const uint colour_index)
{
if (!(IsInsideMM(x, TILE_SIZE, MapMaxX() * TILE_SIZE - 1) &&
IsInsideMM(y, TILE_SIZE, MapMaxY() * TILE_SIZE - 1)))
return 0;
if (x >= static_cast<int>(MapMaxX() * TILE_SIZE) || y >= static_cast<int>(MapMaxY() * TILE_SIZE)) return 0;
/* Very approximative but fast way to get the tile when taking Z into account. */
const TileIndex tile_tmp = TileVirtXY(x, y);
const uint z = TileHeight(tile_tmp) * 4;
if (x + z >= MapSizeX() << 4) {
const TileIndex tile_tmp = TileVirtXY(std::max(0, x), std::max(0, y));
const int z = TileHeight(tile_tmp) * 4;
if (x + z < 0 || y + z < 0 || static_cast<uint>(x + z) >= MapSizeX() << 4) {
/* Wrapping of tile X coordinate causes a graphic glitch below south west border. */
return 0;
}
TileIndex tile = TileVirtXY(x + z, y + z);
if (tile >= MapSize()) return 0;
const uint z2 = TileHeight(tile) * 4;
const int z2 = TileHeight(tile) * 4;
if (unlikely(z2 != z)) {
const uint approx_z = (z + z2) / 2;
if (x + approx_z >= MapSizeX() << 4) {
const int approx_z = (z + z2) / 2;
if (x + approx_z < 0 || y + approx_z < 0 || static_cast<uint>(x + approx_z) >= MapSizeX() << 4) {
/* Wrapping of tile X coordinate causes a graphic glitch below south west border. */
return 0;
}