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Clean up dirty rect computation

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This commit is contained in:
David Zbarsky 2015-08-08 05:00:37 -04:00
parent 7bcb911cea
commit 9a88348978
1 changed files with 13 additions and 18 deletions
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31
components/canvas/canvas_paint_task.rs
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@ -556,46 +556,41 @@ impl<'a> CanvasPaintTask<'a> {
// rgba -> bgra
byte_swap(&mut imagedata);
// 1) If dirtyWidth is negative,
// let dirtyX be dirtyX+dirtyWidth,
// and let dirtyWidth be equal to the absolute magnitude of dirtyWidth.
let image_data_size = image_data_rect.size;
// Step 1. TODO (neutered data)
// Step 2.
if dirty_rect.size.width < 0.0f64 {
dirty_rect.origin.x = dirty_rect.origin.x + dirty_rect.size.width;
dirty_rect.origin.x += dirty_rect.size.width;
dirty_rect.size.width = -dirty_rect.size.width;
}
// 2) If dirtyHeight is negative, let dirtyY be dirtyY+dirtyHeight,
// and let dirtyHeight be equal to the absolute magnitude of dirtyHeight.
if dirty_rect.size.height < 0.0f64 {
dirty_rect.origin.y = dirty_rect.origin.y + dirty_rect.size.height;
dirty_rect.origin.y += dirty_rect.size.height;
dirty_rect.size.height = -dirty_rect.size.height;
}
// 3) If dirtyX is negative, let dirtyWidth be dirtyWidth+dirtyX, and let dirtyX be zero.
// Step 3.
if dirty_rect.origin.x < 0.0f64 {
dirty_rect.size.width += dirty_rect.origin.x;
dirty_rect.origin.x = 0.0f64;
}
// 3) If dirtyY is negative, let dirtyHeight be dirtyHeight+dirtyY, and let dirtyY be zero.
if dirty_rect.origin.y < 0.0f64 {
dirty_rect.size.height += dirty_rect.origin.y;
dirty_rect.origin.y = 0.0f64;
}
// 4) If dirtyX+dirtyWidth is greater than the width attribute of the imagedata argument,
// let dirtyWidth be the value of that width attribute, minus the value of dirtyX.
if dirty_rect.origin.x + dirty_rect.size.width > image_data_rect.size.width {
dirty_rect.size.width = image_data_rect.size.width - dirty_rect.origin.x;
// Step 4.
if dirty_rect.max_x() > image_data_size.width {
dirty_rect.size.width = image_data_size.width - dirty_rect.origin.x;
}
// 4) If dirtyY+dirtyHeight is greater than the height attribute of the imagedata argument,
// let dirtyHeight be the value of that height attribute, minus the value of dirtyY.
if dirty_rect.origin.y + dirty_rect.size.height > image_data_rect.size.height {
dirty_rect.size.height = image_data_rect.size.height - dirty_rect.origin.y;
if dirty_rect.max_y() > image_data_size.height {
dirty_rect.size.height = image_data_size.height - dirty_rect.origin.y;
}
// 5) If either dirtyWidth or dirtyHeight is negative or zero,
// stop without affecting any bitmaps
if dirty_rect.size.width <= 0.0 || dirty_rect.size.height <= 0.0 {