private void drawSatValPanel(Canvas canvas)
{
/*
* Draw time for this code without using bitmap cache and hardware acceleration was around 20ms.
* Now with the bitmap cache and the ability to use hardware acceleration we are down at 1ms as long as the hue isn't changed.
* If the hue is changed we the sat/val rectangle will be rendered in software and it takes around 10ms.
* But since the rest of the view will be rendered in hardware the performance gain is big!
*/
RectF rect = mSatValRect;
if (BORDER_WIDTH_PX > 0)
{
mBorderPaint.Color = new Color((int)mBorderColor);
canvas.DrawRect(mDrawingRect.Left, mDrawingRect.Top, rect.Right + BORDER_WIDTH_PX, rect.Bottom + BORDER_WIDTH_PX, mBorderPaint);
}
if (mValShader == null)
{
//Black gradient has either not been created or the view has been resized.
uint startColor = 0xFFFFFFFF;
uint endColor = 0xFF000000;
mValShader = new LinearGradient(rect.Left, rect.Top, rect.Left, rect.Bottom,
new Color((int)startColor), new Color((int)endColor), Shader.TileMode.Clamp);
}
//If the hue has changed we need to recreate the cache.
if (mSatValBackgroundCache == null || mSatValBackgroundCache.value != mHue)
{
if (mSatValBackgroundCache == null)
{
mSatValBackgroundCache = new BitmapCache();
}
//We create our bitmap in the cache if it doesn't exist.
if (mSatValBackgroundCache.bitmap == null)
{
mSatValBackgroundCache.bitmap = Bitmap.CreateBitmap((int)rect.Width(), (int)rect.Height(), Bitmap.Config.Argb8888);
}
//We create the canvas once so we can draw on our bitmap and the hold on to it.
if (mSatValBackgroundCache.canvas == null)
{
mSatValBackgroundCache.canvas = new Canvas(mSatValBackgroundCache.bitmap);
}
int rgb = Color.HSVToColor(new float[] { mHue, 1f, 1f });
uint startColor = 0xFFFFFFFF;
mSatShader = new LinearGradient(rect.Left, rect.Top, rect.Right, rect.Top,
new Color((int)startColor), new Color(rgb), Shader.TileMode.Clamp);
ComposeShader mShader = new ComposeShader(mValShader, mSatShader, PorterDuff.Mode.Multiply);
mSatValPaint.SetShader(mShader);
//ly we draw on our canvas, the result will be stored in our bitmap which is already in the cache.
//Since this is drawn on a canvas not rendered on screen it will automatically not be using the hardware acceleration.
//And this was the code that wasn't supported by hardware acceleration which mean there is no need to turn it of anymore.
//The rest of the view will still be hardware accelerated!!
mSatValBackgroundCache.canvas.DrawRect(0, 0, mSatValBackgroundCache.bitmap.Width, mSatValBackgroundCache.bitmap.Height, mSatValPaint);
//We set the hue value in our cache to which hue it was drawn with,
//then we know that if it hasn't changed we can reuse our cached bitmap.
mSatValBackgroundCache.value = mHue;
}
//We draw our bitmap from the cached, if the hue has changed
//then it was just recreated otherwise the old one will be used.
canvas.DrawBitmap(mSatValBackgroundCache.bitmap, null, rect, null);
Point p = satValToPoint(mSat, mVal);
mSatValTrackerPaint.Color = Color.Black;
canvas.DrawCircle(p.X, p.Y, PALETTE_CIRCLE_TRACKER_RADIUS - 1f * mDensity, mSatValTrackerPaint);
mSatValTrackerPaint.Color = Color.LightGray;
canvas.DrawCircle(p.X, p.Y, PALETTE_CIRCLE_TRACKER_RADIUS, mSatValTrackerPaint);
}
private void DrawSatValPanel(Canvas canvas)
{
#if __ANDROID_11__
if (Android.OS.Build.VERSION.SdkInt > Android.OS.BuildVersionCodes.Honeycomb)
{
RootView.SetLayerType(LayerType.Software, null);
}
#endif
var rect = _satValRect;
if(BorderWidthPx > 0){
_borderPaint.Color = _borderColor;
canvas.DrawRect(_drawingRect.Left, _drawingRect.Top, rect.Right + BorderWidthPx, rect.Bottom + BorderWidthPx, _borderPaint);
}
if (_valShader == null) {
_valShader = new LinearGradient(rect.Left, rect.Top, rect.Left, rect.Bottom,
Color.Argb(255,255,255,255), Color.Argb(255,0,0,0), Shader.TileMode.Clamp);
}
var rgb = ColorUtils.ColorFromHSV(_hue/360f,1f,1f);
using (_satShader = new LinearGradient(rect.Left, rect.Top, rect.Right, rect.Top,
Color.Argb(255,255,255,255), rgb, Shader.TileMode.Clamp))
{
var mShader = new ComposeShader(_valShader, _satShader, PorterDuff.Mode.Multiply);
_satValPaint.SetShader(mShader);
canvas.DrawRect(rect, _satValPaint);
}
var p = SatValToPoint(_sat, _val);
_satValTrackerPaint.Color = Color.Argb(255,0,0,0);
canvas.DrawCircle(p.X, p.Y, _paletteCircleTrackerRadius - 1f * _density, _satValTrackerPaint);
_satValTrackerPaint.Color = Color.Argb(255, 221, 221, 221);
canvas.DrawCircle(p.X, p.Y, _paletteCircleTrackerRadius, _satValTrackerPaint);
}
private Bitmap createColorWheelBitmap(int width, int height)
{
Bitmap bitmap = Bitmap.CreateBitmap(width, height, Bitmap.Config.Argb8888);
int colorCount = 12;
int colorAngleStep = 360 / 12;
int[] colors = new int[colorCount + 1];
float[] hsv = new float[] { 0f, 1f, 1f };
for (int i = 0; i < colors.Length; i++)
{
hsv[0] = (i * colorAngleStep + 180) % 360;
colors[i] = Color.HSVToColor(hsv);
}
colors[colorCount] = colors[0];
SweepGradient sweepGradient = new SweepGradient(width / 2, height / 2, colors, null);
RadialGradient radialGradient = new RadialGradient(width / 2, height / 2, colorWheelRadius, new Color(0xFFFFFF), new Color(0x00FFFFFF), Shader.TileMode.Clamp);
ComposeShader composeShader = new ComposeShader(sweepGradient, radialGradient, PorterDuff.Mode.SrcOver);
colorWheelPaint.SetShader(composeShader);
Canvas canvas = new Canvas(bitmap);
canvas.DrawCircle(width / 2, height / 2, colorWheelRadius, colorWheelPaint);
return bitmap;
}
private void DrawSatValPanel(Canvas canvas)
{
var rect = _satValRect;
if(BorderWidthPx > 0){
_borderPaint.Color = _borderColor;
canvas.DrawRect(_drawingRect.Left, _drawingRect.Top, rect.Right + BorderWidthPx, rect.Bottom + BorderWidthPx, _borderPaint);
}
if (_valShader == null) {
_valShader = new LinearGradient(rect.Left, rect.Top, rect.Left, rect.Bottom,
Color.Argb(255,255,255,255), Color.Argb(255,0,0,0), Shader.TileMode.Clamp);
}
var rgb = ColorUtils.ColorFromHSV(_hue/360f,1f,1f);
using (_satShader = new LinearGradient(rect.Left, rect.Top, rect.Right, rect.Top,
Color.Argb(255,255,255,255), rgb, Shader.TileMode.Clamp))
{
var mShader = new ComposeShader(_valShader, _satShader, PorterDuff.Mode.Multiply);
_satValPaint.SetShader(mShader);
canvas.DrawRect(rect, _satValPaint);
}
var p = SatValToPoint(_sat, _val);
_satValTrackerPaint.Color = Color.Argb(255,0,0,0);
canvas.DrawCircle(p.X, p.Y, _paletteCircleTrackerRadius - 1f * _density, _satValTrackerPaint);
_satValTrackerPaint.Color = Color.Argb(255, 221, 221, 221);
canvas.DrawCircle(p.X, p.Y, _paletteCircleTrackerRadius, _satValTrackerPaint);
}