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Respects current ctx scale for mesh pattern

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This commit is contained in:
Yury Delendik 2014-01-29 10:16:32 -06:00
parent 561683d2e9
commit 3595c2c360
1 changed files with 21 additions and 7 deletions
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28
src/display/pattern_helper.js
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@ -148,21 +148,21 @@ var createMeshCanvas = (function createMeshCanvasClosure() {
}
}
function createMeshCanvas(owner, bounds, coords, colors, figures,
function createMeshCanvas(bounds, combinesScale, coords, colors, figures,
backgroundColor) {
// we will increase scale on some weird factor to let antialiasing take
// care of "rough" edges
var EXPECTED_SCALE = 1.5;
var EXPECTED_SCALE = 1.1;
// MAX_PATTERN_SIZE is used to avoid OOM situation.
var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough
var boundsWidth = bounds[2] - bounds[0];
var boundsHeight = bounds[3] - bounds[1];
var width = Math.min(Math.ceil(Math.abs(boundsWidth * EXPECTED_SCALE)),
MAX_PATTERN_SIZE);
var height = Math.min(Math.ceil(Math.abs(boundsHeight * EXPECTED_SCALE)),
MAX_PATTERN_SIZE);
var width = Math.min(Math.ceil(Math.abs(boundsWidth * combinesScale[0] *
EXPECTED_SCALE)), MAX_PATTERN_SIZE);
var height = Math.min(Math.ceil(Math.abs(boundsHeight * combinesScale[1] *
EXPECTED_SCALE)), MAX_PATTERN_SIZE);
var scaleX = width / boundsWidth;
var scaleY = height / boundsHeight;
@ -206,10 +206,24 @@ ShadingIRs.Mesh = {
return {
type: 'Pattern',
getPattern: function Mesh_getPattern(ctx, owner, shadingFill) {
var combinedScale;
// Obtain scale from matrix and current transformation matrix.
if (shadingFill) {
combinedScale = Util.singularValueDecompose2dScale(
ctx.mozCurrentTransform);
} else {
var matrixScale = Util.singularValueDecompose2dScale(matrix);
var curMatrixScale = Util.singularValueDecompose2dScale(
owner.baseTransform);
combinedScale = [matrixScale[0] * curMatrixScale[0],
matrixScale[1] * curMatrixScale[1]];
}
// Rasterizing on the main thread since sending/queue large canvases
// might cause OOM.
// TODO consider using WebGL or asm.js to perform rasterization
var temporaryPatternCanvas = createMeshCanvas(owner, bounds,
var temporaryPatternCanvas = createMeshCanvas(bounds, combinedScale,
coords, colors, figures, shadingFill ? null : background);
if (!shadingFill) {