A new version of Graphics was added to project The Inbox:
http://source.squeak.org/inbox/Graphics-mt.152.mcz==================== Summary ====================
Name: Graphics-mt.152
Author: mt
Time: 10 November 2010, 4:14:35.129 pm
UUID: 04582fa8-3ca1-e440-987a-74483e96950d
Ancestors: Graphics-dtl.151
- fixed font rendering to support translucent colors
=============== Diff against Graphics-dtl.151 ===============
Item was changed:
----- Method: BitBlt>>installStrikeFont:foregroundColor:backgroundColor: (in category 'private') -----
installStrikeFont: aStrikeFont foregroundColor: foregroundColor backgroundColor: backgroundColor
| lastSourceDepth targetColor |
sourceForm ifNotNil:[lastSourceDepth := sourceForm depth].
sourceForm := aStrikeFont glyphs.
"Ignore any halftone pattern since we use a color map approach here"
halftoneForm := nil.
sourceY := 0.
height := aStrikeFont height.
sourceForm depth = 1 ifTrue: [
self combinationRule: Form paint.
(colorMap notNil and:[lastSourceDepth = sourceForm depth]) ifFalse: [
"Set up color map for a different source depth (color font)"
"Uses caching for reasonable efficiency"
colorMap := self cachedFontColormapFrom: sourceForm depth to: destForm depth.
colorMap at: 1 put: (destForm pixelValueFor: backgroundColor)].
colorMap at: 2 put: (destForm pixelValueFor: foregroundColor).
]
ifFalse: [
(Preferences subPixelRenderFonts and: [ foregroundColor = Color black or: [ Preferences subPixelRenderColorFonts ]]) ifTrue: [
destForm depth > 8 ifTrue: [
+ "Only force #rgbMul if color is not translucent for better result quality. Alpha values are ignored with #rgbMul."
+ foregroundColor isTranslucent
+ ifFalse: [self combinationRule: Form rgbMul].
- "rgbMul is equivalent to component alpha blend if text is black (only faster, hehe)"
- self combinationRule: 37. "RGBMul"
colorMap := (destForm depth = 32 or: [ (foregroundColor = Color black) not ]) ifTrue: [
"rgbMul / rgbAdd IS component alpha blend for any color of text (neat trick, eh!!)"
"This colorMap is to be used on the second pass with rule 20 (rgbAdd)
See #displayString:from:to:at:strikeFont:kern:"
"Note: In 32bpp we always need the second pass, as the source could have transparent pixels, and we need to add to the alpha channel"
self colorConvertingMap: foregroundColor from: sourceForm depth to: destForm depth keepSubPixelAA: true]]
ifFalse: [
self combinationRule: 25. "Paint"
targetColor := foregroundColor = Color black ifFalse: [ foregroundColor ].
colorMap := self colorConvertingMap: targetColor from: sourceForm depth to: destForm depth keepSubPixelAA: true]
]
ifFalse: [
"Do not use rule 34 for 16bpp display. TTCFont uses it, but it builds a glyphs cache for each color used!!"
self combinationRule: (destForm depth = 32 ifTrue: [34 "alphaBlendScaled"] ifFalse: [25 "Paint"]).
colorMap := self colorConvertingMap: foregroundColor from: sourceForm depth to: destForm depth keepSubPixelAA: false
]
].!
Locked
