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Gecko:Image Snapping and Rendering: Difference between revisions
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Gecko:Image Snapping and Rendering (view source)
Revision as of 08:49, 13 November 2008
, 13 November 2008→Algorithm
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* Compute device pixel draw rectangle by intersecting the device pixel fill rectangle with the dirty rectangle scaled to device pixels and rounded out. This is the area to cairo_fill. But only intersect with the dirty rect if the transformation from image space to device space is a translation by whole pixels; otherwise there may be filtering which would cause edge pixel values to be affected by the dirty rect intersection. | * Compute device pixel draw rectangle by intersecting the device pixel fill rectangle with the dirty rectangle scaled to device pixels and rounded out. This is the area to cairo_fill. But only intersect with the dirty rect if the transformation from image space to device space is a translation by whole pixels; otherwise there may be filtering which would cause edge pixel values to be affected by the dirty rect intersection. | ||
Requirement 2 is | Requirement 2 is satisfied since the dirty rect is only used to constrain the filled area, and only when filtering does not occur. Requirements 3, 4, 5, 6 and 7 are satisfied by construction. | ||
Requirement 8 is difficult to prove. | |||