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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 03:10, 4 October 2008
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# Every image pixel sampled in actual rendering would also be sampled by an ideal rendering to an infinite-resolution device. (RATIONALE: Web authors should not be faced with fringes contributed by pixels they did not intend to be sampled.) | # Every image pixel sampled in actual rendering would also be sampled by an ideal rendering to an infinite-resolution device. (RATIONALE: Web authors should not be faced with fringes contributed by pixels they did not intend to be sampled.) | ||
# If the initial rectangle size in device pixels equals the image size in CSS pixels, then each filled device pixel should be set exactly to one image pixel. (RATIONALE: If the scale factor in the author's design is exactly the inverse of the scale required by the device, we must avoid scaling and subpixel translation or there will be unnecessary image blurring and performance penalty.) | # If the initial rectangle size in device pixels equals the image size in CSS pixels, then each filled device pixel should be set exactly to one image pixel. (RATIONALE: If the scale factor in the author's design is exactly the inverse of the scale required by the device, we must avoid scaling and subpixel translation or there will be unnecessary image blurring and performance penalty.) | ||
# If the logical fill rectangle, mapped back to image space, contains a whole image pixel, that pixel should be sampled in the output. (RATIONALE: image data that the author clearly intended to be in the output should appear.) | |||