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pixi.js/docs/files/src_pixi_renderers_canvas_utils_CanvasTinter.js.html
Mat Groves 847eb6c48e Docs updated 
Fixed issue where alpha not being set correctly in canvas spriteBatch
Fixed issue where previous stage events did not get removed correctly
2014-01-28 00:08:50 +00:00

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<h1 class="file-heading">File: src/pixi/renderers/canvas/utils/CanvasTinter.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves
*
*
*/
PIXI.CanvasTinter = function()
{
/// this.textureCach
};
//PIXI.CanvasTinter.cachTint = true;
PIXI.CanvasTinter.getTintedTexture = function(sprite, color)
{
//
// cache on sprite
// cache on texture
// no cache
var texture = sprite.texture;
color = PIXI.CanvasTinter.roundColor(color);
var stringColor = &quot;#&quot; + (&quot;00000&quot; + ( color | 0).toString(16)).substr(-6);
texture.tintCache = texture.tintCache || {};
if(texture.tintCache[stringColor]) return texture.tintCache[stringColor];
// clone texture..
var canvas = PIXI.CanvasTinter.canvas || document.createElement(&quot;canvas&quot;);
//PIXI.CanvasTinter.tintWithPerPixel(texture, stringColor, canvas);
PIXI.CanvasTinter.tintMethod(texture, color, canvas);
if(PIXI.CanvasTinter.convertTintToImage)
{
// is this better?
var tintImage = new Image();
tintImage.src = canvas.toDataURL();
texture.tintCache[stringColor] = tintImage;
}
else
{
texture.tintCache[stringColor] = canvas;
// if we are not converting the texture to an image then we need to lose the reference to the canvas
PIXI.CanvasTinter.canvas = null;
}
return canvas;
};
PIXI.CanvasTinter.tintWithMultiply = function(texture, color, canvas)
{
var context = canvas.getContext( &quot;2d&quot; );
var frame = texture.frame;
canvas.width = frame.width;
canvas.height = frame.height;
context.fillStyle = &quot;#&quot; + (&quot;00000&quot; + ( color | 0).toString(16)).substr(-6);
context.fillRect(0, 0, frame.width, frame.height);
context.globalCompositeOperation = &quot;multiply&quot;;
context.drawImage(texture.baseTexture.source,
frame.x,
frame.y,
frame.width,
frame.height,
0,
0,
frame.width,
frame.height);
context.globalCompositeOperation = &quot;destination-atop&quot;;
context.drawImage(texture.baseTexture.source,
frame.x,
frame.y,
frame.width,
frame.height,
0,
0,
frame.width,
frame.height);
};
PIXI.CanvasTinter.tintWithOverlay = function(texture, color, canvas)
{
var context = canvas.getContext( &quot;2d&quot; );
var frame = texture.frame;
canvas.width = frame.width;
canvas.height = frame.height;
context.globalCompositeOperation = &quot;copy&quot;;
context.fillStyle = &quot;#&quot; + (&quot;00000&quot; + ( color | 0).toString(16)).substr(-6);
context.fillRect(0, 0, frame.width, frame.height);
context.globalCompositeOperation = &quot;destination-atop&quot;;
context.drawImage(texture.baseTexture.source,
frame.x,
frame.y,
frame.width,
frame.height,
0,
0,
frame.width,
frame.height);
//context.globalCompositeOperation = &quot;copy&quot;;
};
PIXI.CanvasTinter.tintWithPerPixel = function(texture, color, canvas)
{
var context = canvas.getContext( &quot;2d&quot; );
var frame = texture.frame;
canvas.width = frame.width;
canvas.height = frame.height;
context.globalCompositeOperation = &quot;copy&quot;;
context.drawImage(texture.baseTexture.source,
frame.x,
frame.y,
frame.width,
frame.height,
0,
0,
frame.width,
frame.height);
var rgbValues = PIXI.hex2rgb(color);
var r = rgbValues[0], g = rgbValues[1], b = rgbValues[2];
var pixelData = context.getImageData(0, 0, frame.width, frame.height);
var pixels = pixelData.data;
for (var i = 0; i &lt; pixels.length; i += 4)
{
pixels[i+0] *= r;
pixels[i+1] *= g;
pixels[i+2] *= b;
}
context.putImageData(pixelData, 0, 0);
};
PIXI.CanvasTinter.roundColor = function(color)
{
var step = PIXI.CanvasTinter.cacheStepsPerColorChannel;
var rgbValues = PIXI.hex2rgb(color);
rgbValues[0] = Math.min(255, (rgbValues[0] / step) * step);
rgbValues[1] = Math.min(255, (rgbValues[1] / step) * step);
rgbValues[2] = Math.min(255, (rgbValues[2] / step) * step);
return PIXI.rgb2hex(rgbValues);
};
PIXI.CanvasTinter.cacheStepsPerColorChannel = 8;
PIXI.CanvasTinter.convertTintToImage = false;
PIXI.CanvasTinter.canUseMultiply = PIXI.canUseNewCanvasBlendModes();
PIXI.CanvasTinter.tintMethod = PIXI.CanvasTinter.canUseMultiply ? PIXI.CanvasTinter.tintWithMultiply : PIXI.CanvasTinter.tintWithPerPixel;
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