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commit e90eda658220809b70c37e954d2624e3cfdcd5ea Author: Cyril Hrubis metan@ucw.cz Date: Sat Nov 10 17:27:32 2012 +0100

doc: Move ProgressCallback to core, add example.

diff --git a/doc/basic_types.txt b/doc/basic_types.txt index f02688a..1542083 100644 --- a/doc/basic_types.txt +++ b/doc/basic_types.txt @@ -88,33 +88,3 @@ void GP_ColorLoadContextPixels(GP_Pixel pixels[], GP_Context *context); Loads array of 'GP_Pixel' of size 'GP_COL_MAX', the array is then used with the GP_Color enum as 'pixels[GP_COL_BLACK]'.

-Progress Callback -~~~~~~~~~~~~~~~~~ - -The 'GP_ProgressCallback' is a structure that stores user-defined callback -function and user-defined pointer and percentage. - -It is passed as last parameter to functions that would take some time to -complete and adds capability to track the operation progress as well as to -abort the operation. - -Currently it's used for filters and loaders. - -[source,c] -------------------------------------------------------------------------------- -typdedef struct GP_ProgressCallback { - float percentage; - int (*callback)(struct GP_ProgressCallback *self); - void *priv; -} GP_ProgressCallback; -------------------------------------------------------------------------------- - -If non 'NULL' progress callback structure is passed to a function, the -callback function is periodically called and the percentage is updated. - -The return value from callback could abort the function execution. If non zero -value is returned operation is aborted, all memory freed etc. and in case of -bitmap loaders 'errno' is set to 'ECANCELED'. - -The callback, if supported, is the last parameter of a function. - diff --git a/doc/core.txt b/doc/core.txt index fdb8056..3e20ee2 100644 --- a/doc/core.txt +++ b/doc/core.txt @@ -56,6 +56,39 @@ Value clamping macros.

NOTE: this header is not included by including the 'GP.h' header.

+Progress Callback +~~~~~~~~~~~~~~~~~ + +The 'GP_ProgressCallback' is a structure that stores user-defined callback +function and user-defined pointer and percentage. + +It is passed as last parameter to functions that would take some time to +complete and adds capability to track the operation progress as well as to +abort the operation. + +Currently it's used for filters and loaders. + +[source,c] +------------------------------------------------------------------------------- +typdedef struct GP_ProgressCallback { + float percentage; + int (*callback)(struct GP_ProgressCallback *self); + void *priv; +} GP_ProgressCallback; +------------------------------------------------------------------------------- + +If non 'NULL' progress callback structure is passed to a function, the +callback function is periodically called and the percentage is updated. + +The return value from callback could abort the function execution. If non zero +value is returned operation is aborted, all memory freed etc. and in case of +bitmap loaders 'errno' is set to 'ECANCELED'. + +The callback, if supported, is the last parameter of a function. + +For example usage see progress callback +link:example_loaders_progress_callback.html[example]. + Temporary Buffer Allocator ~~~~~~~~~~~~~~~~~~~~~~~~~~

diff --git a/doc/example_loaders_progress_callback.txt b/doc/example_loaders_progress_callback.txt new file mode 100644 index 0000000..7da5160 --- /dev/null +++ b/doc/example_loaders_progress_callback.txt @@ -0,0 +1,7 @@ +Graphics Backend Example +------------------------ + +[source,c] +------------------------------------------------------------------ +include::../demos/c_simple/loaders.c[] +------------------------------------------------------------------

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Summary of changes: doc/basic_types.txt | 30 ------------------ doc/core.txt | 33 ++++++++++++++++++++ ...d.txt => example_loaders_progress_callback.txt} | 2 +- 3 files changed, 34 insertions(+), 31 deletions(-) copy doc/{example_backend.txt => example_loaders_progress_callback.txt} (80%)

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