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commit f8e9982dea3d60b4db125a4b6aeb56b661f9fe43 Author: Cyril Hrubis metan@ucw.cz Date: Wed Jan 2 00:36:58 2013 +0100

doc: context: Clarify the context->pixels description.

diff --git a/doc/context.txt b/doc/context.txt index 0d1d18b..b973f91 100644 --- a/doc/context.txt +++ b/doc/context.txt @@ -37,10 +37,17 @@ typedef struct GP_Context { } GP_Context; -------------------------------------------------------------------------------

-The 'pixels' field points to the image data, stored as a one-dimensional -array of byte-aligned lines. (There can be some unused space at the end of -each line; this is reflected by the 'bytes_per_row' value being greater -than what would be needed for that pixel format). +The 'pixels' field points to the image data. + +The 'pixels' are stored as a one-dimensional array consisting of byte-aligned +lines (i.e. each image line starts at whole byte and ends at whole byte). The +'pixels' array starts exactly at the start of the first line. Each line is +'bytes_per_row' bytes long. The first pixel may actually start at 'offset' bit +in the first byte in each line (but only for some sub contexts for pixel types +that are not byte aligned). The first pixel is followed by the rest of the +pixels in the image line (there is 'w' pixels in each line) and ends somewhere +before the end of the line (i.e. there may be padding before the start of the +next line or in case of subcontexts image data of the parent context).

Rotation ^^^^^^^^

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Summary of changes: doc/context.txt | 15 +++++++++++---- 1 files changed, 11 insertions(+), 4 deletions(-)

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