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deal with tiles that have padding

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This commit is contained in:
Tom 2024-03-05 15:39:54 -05:00
parent a42a0d1822
commit 029a40aa21
1 changed files with 19 additions and 6 deletions
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25
src/webgldrawer.js
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@ -897,19 +897,32 @@
let texture = gl.createTexture();
let position;
let overlap = tiledImage.source.tileOverlap;
// deal with tiles where there is padding, i.e. the pixel data doesn't take up the entire provided canvas
let sourceWidthFraction, sourceHeightFraction;
if (tile.sourceBounds) {
sourceWidthFraction = Math.min(tile.sourceBounds.width, canvas.width) / canvas.width;
sourceHeightFraction = Math.min(tile.sourceBounds.height, canvas.height) / canvas.height;
} else {
sourceWidthFraction = 1;
sourceHeightFraction = 1;
}
if( overlap > 0){
// calculate the normalized position of the rect to actually draw
// discarding overlap.
let overlapFraction = this._calculateOverlapFraction(tile, tiledImage);
let left = tile.x === 0 ? 0 : overlapFraction.x;
let top = tile.y === 0 ? 0 : overlapFraction.y;
let right = tile.isRightMost ? 1 : 1 - overlapFraction.x;
let bottom = tile.isBottomMost ? 1 : 1 - overlapFraction.y;
let left = (tile.x === 0 ? 0 : overlapFraction.x) * sourceWidthFraction;
let top = (tile.y === 0 ? 0 : overlapFraction.y) * sourceHeightFraction;
let right = (tile.isRightMost ? 1 : 1 - overlapFraction.x) * sourceWidthFraction;
let bottom = (tile.isBottomMost ? 1 : 1 - overlapFraction.y) * sourceHeightFraction;
position = this._makeQuadVertexBuffer(left, right, top, bottom);
} else {
// no overlap: this texture can use the unit quad as its position data
} else if (sourceWidthFraction === 1 && sourceHeightFraction === 1) {
// no overlap and no padding: this texture can use the unit quad as its position data
position = this._unitQuad;
} else {
position = this._makeQuadVertexBuffer(0, sourceWidthFraction, 0, sourceHeightFraction);
}
let textureInfo = {