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Merge pull request #21294 from Snuffleupagus/mv-scaleMinMax

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Move the `Util.scaleMinMax` helper into `src/display/canvas_dependency_tracker.js`
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Tim van der Meij 2026-05-18 20:18:31 +02:00 committed by GitHub
commit 9ebee868c9
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2 changed files with 51 additions and 52 deletions
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52
src/display/canvas_dependency_tracker.js
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@ -28,6 +28,56 @@ function expandBBox(array, index, minX, minY, maxX, maxY) {
array[index * 4 + 3] = Math.max(array[index * 4 + 3], maxY);
}
// Apply a scaling matrix to some min/max values.
// If a scaling factor is negative then min and max must be swapped.
function scaleMinMax(transform, minMax) {
let temp;
if (transform[0]) {
if (transform[0] < 0) {
temp = minMax[0];
minMax[0] = minMax[2];
minMax[2] = temp;
}
minMax[0] *= transform[0];
minMax[2] *= transform[0];
if (transform[3] < 0) {
temp = minMax[1];
minMax[1] = minMax[3];
minMax[3] = temp;
}
minMax[1] *= transform[3];
minMax[3] *= transform[3];
} else {
temp = minMax[0];
minMax[0] = minMax[1];
minMax[1] = temp;
temp = minMax[2];
minMax[2] = minMax[3];
minMax[3] = temp;
if (transform[1] < 0) {
temp = minMax[1];
minMax[1] = minMax[3];
minMax[3] = temp;
}
minMax[1] *= transform[1];
minMax[3] *= transform[1];
if (transform[2] < 0) {
temp = minMax[0];
minMax[0] = minMax[2];
minMax[2] = temp;
}
minMax[0] *= transform[2];
minMax[2] *= transform[2];
}
minMax[0] += transform[4];
minMax[1] += transform[5];
minMax[2] += transform[4];
minMax[3] += transform[5];
}
// This is computed rathter than hard-coded to keep into
// account the platform's endianess.
const EMPTY_BBOX = new Uint32Array(new Uint8Array([255, 255, 0, 0]).buffer)[0];
@ -613,7 +663,7 @@ class CanvasDependencyTracker {
computedBBox = [0, 0, 0, 0];
Util.axialAlignedBoundingBox(fontBBox, font.fontMatrix, computedBBox);
if (scale !== 1 || x !== 0 || y !== 0) {
Util.scaleMinMax([scale, 0, 0, -scale, x, y], computedBBox);
scaleMinMax([scale, 0, 0, -scale, x, y], computedBBox);
}
if (isBBoxTrustworthy) {

51
src/shared/util.js
View File

@ -711,57 +711,6 @@ class Util {
return `#${this.hexNums[r]}${this.hexNums[g]}${this.hexNums[b]}`;
}
// Apply a scaling matrix to some min/max values.
// If a scaling factor is negative then min and max must be
// swapped.
static scaleMinMax(transform, minMax) {
let temp;
if (transform[0]) {
if (transform[0] < 0) {
temp = minMax[0];
minMax[0] = minMax[2];
minMax[2] = temp;
}
minMax[0] *= transform[0];
minMax[2] *= transform[0];
if (transform[3] < 0) {
temp = minMax[1];
minMax[1] = minMax[3];
minMax[3] = temp;
}
minMax[1] *= transform[3];
minMax[3] *= transform[3];
} else {
temp = minMax[0];
minMax[0] = minMax[1];
minMax[1] = temp;
temp = minMax[2];
minMax[2] = minMax[3];
minMax[3] = temp;
if (transform[1] < 0) {
temp = minMax[1];
minMax[1] = minMax[3];
minMax[3] = temp;
}
minMax[1] *= transform[1];
minMax[3] *= transform[1];
if (transform[2] < 0) {
temp = minMax[0];
minMax[0] = minMax[2];
minMax[2] = temp;
}
minMax[0] *= transform[2];
minMax[2] *= transform[2];
}
minMax[0] += transform[4];
minMax[1] += transform[5];
minMax[2] += transform[4];
minMax[3] += transform[5];
}
// Concatenates two transformation matrices together and returns the result.
static transform(m1, m2) {
return [