cinco/glitch-images
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small speed improvements

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- only get the imagedata once, when the image first loads
- only clear the canvas after image load
This commit is contained in:
Georg Fischer 2013-09-28 12:47:56 +02:00
parent 4715d6e422
commit 5640d7a10b
1 changed files with 20 additions and 13 deletions
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33
scripts/src/process.js
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@ -37,6 +37,8 @@ define(
if ( ! is_processing ) if ( ! is_processing )
{ {
image = img; image = img;
resetCanvas( image );
updateImageData( image );
processImage( image ); processImage( image );
} }
} }
@ -64,29 +66,34 @@ define(
} }
} }
function updateImageData( img )
{
tmp_ctx.drawImage( img, 0, 0 );
image_data = tmp_ctx.getImageData( 0, 0, tmp_canvas.width, tmp_canvas.height );
}
function resetCanvas( img )
{
canvas_helper.clear( tmp_canvas, tmp_ctx );
canvas_helper.resize( tmp_canvas, img );
canvas_helper.clear( canvas, ctx );
canvas_helper.resize( canvas, img );
}
function processImage( img ) function processImage( img )
{ {
is_processing = true; is_processing = true;
canvas_helper.clear( tmp_canvas, tmp_ctx );
canvas_helper.clear( canvas, ctx );
canvas_helper.resize( tmp_canvas, img );
canvas_helper.resize( canvas, img );
tmp_ctx.drawImage( img, 0, 0 );
image_data = tmp_ctx.getImageData( 0, 0, tmp_canvas.width, tmp_canvas.height );
glitch( image_data, values, draw ); glitch( image_data, values, draw );
} }
function draw( image_data ) function draw( glitched_image_data )
{ {
canvas_helper.resize( canvas, image_data ); ctx.putImageData( glitched_image_data, 0, 0 );
ctx.putImageData( image_data, 0, 0 );
is_processing = false; is_processing = false;
image_data = null; glitched_image_data = null;
} }
function exportData() function exportData()