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gflDrawPointColor
== gflDrawPointColor ==


The gflDrawPointColor function allows to draw a point on a picture.  
The gflDrawPointColor function allows to draw a point on a picture.  


GFL_ERROR <b>gflDrawPointColor</b>(
  GFL_BITMAP* src, 
  GFL_INT32 x, 
  GFL_INT32 y, 
  GFL_UINT32 line_width, 
  const GFL_COLOR* line_color, 
  GFL_BITMAP** dst, 
);


GFL_ERROR gflDrawPointColor(
'''Parameters'''
  GFL_BITMAP * src, 
  GFL_INT32 x, 
  GFL_INT32 y, 
  GFL_UINT32 line_width, 
  const GFL_COLOR * line_color, 
  GFL_BITMAP ** dst, 
);


Parameters
:src
::Pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure.
:x
::X position.
:y
::Y position.
:line_width
::Width of the point (1 à 13).
:line_color
::Pointer to a [[Structures#GFL_COLOR|GFL_COLOR]] structure. Color of the point.
:dst
::Address of a pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure. NULL if on the same instance.


src
'''Return value'''
Pointer to a GFL_BITMAP structure.
:The function returns GFL_NO_ERROR if it is successful or a value of [[Error|GFL_ERROR]].  
x
X position.
y
Y position.
line_width
Width of the point (1 à 13).
line_color
Pointer to a GFL_COLOR structure. Color of the point.  
dst gflDrawLineColor


The gflDrawLineColor function allows to draw a line on a picture.


== gflDrawLineColor ==


GFL_ERROR gflDrawLineColor(
The gflDrawLineColor function allows to draw a line on a picture.  
  GFL_BITMAP * src, 
  GFL_INT32 x0, 
  GFL_INT32 y0, 
  GFL_INT32 x1, 
  GFL_INT32 y1, 
  GFL_UINT32 line_width, 
  const GFL_COLOR * line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP ** dst, 
);
 
Parameters
 
src
Pointer to a GFL_BITMAP structure.
x0
X start position.
y0
Y start position.
x1
X end position.
y1
Y end position.
line_width
Width of the line (1 to 13).
line_color
Pointer to a GFL_COLOR structure. Color of the line.
line_style
Works only with a line width of 1. GFL_LINE_STYLE_SOLID Solid
GFL_LINE_STYLE_DASH Dashes
GFL_LINE_STYLE_DOT Dots
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots
 
dst
Address of a pointer to a GFL_BITMAP structure.
NULL if on the same instance.  


Return value
GFL_ERROR <b>gflDrawLineColor</b>(
  GFL_BITMAP* src, 
  GFL_INT32 x0, 
  GFL_INT32 y0, 
  GFL_INT32 x1, 
  GFL_INT32 y1, 
  GFL_UINT32 line_width, 
  const GFL_COLOR* line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP** dst, 
);


The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.
'''Parameters'''


:src
::Pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure.
:x0
::X start position.
:y0
::Y start position.
:x1
::X end position.
:y1
::Y end position.
:line_width
::Width of the line (1 to 13).
:line_color
::Pointer to a [[Structures#GFL_COLOR|GFL_COLOR]] structure. Color of the line.
:line_style
::Works only with a line width of 1.
::{|
|GFL_LINE_STYLE_SOLID || Solid
|-
|GFL_LINE_STYLE_DASH || Dashes
|-
|GFL_LINE_STYLE_DOT || Dots
|-
|GFL_LINE_STYLE_DASHDOT || Alternating dashes and dots
|-
|GFL_LINE_STYLE_DASHDOTDOT || Alternating dashes and double dots
|}
:dst
::Address of a pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure. NULL if on the same instance.


See also
'''Return value'''
:The function returns GFL_NO_ERROR if it is successful or a value of [[Error|GFL_ERROR]].


gflDrawPointColor, gflDrawPolylineColor, gflDrawRectangleColor, gflDrawPolygonColor, gflDrawCircleColor


gflDrawPolylineColor
== gflDrawPolylineColor ==


The gflDrawPolylineColor function allows to draw a polyline on a picture.  
The gflDrawPolylineColor function allows to draw a polyline on a picture.  


GFL_ERROR <b>gflDrawPolylineColor</b>(
  GFL_BITMAP* src, 
  const GFL_POINT points[], 
  GFL_INT32 num_points, 
  GFL_UINT32 line_width, 
  const GFL_COLOR* line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP** dst, 
);


GFL_ERROR gflDrawPolylineColor(
'''Parameters'''
  GFL_BITMAP * src, 
  const GFL_POINT points[], 
  GFL_INT32 num_points, 
  GFL_UINT32 line_width, 
  const GFL_COLOR * line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP ** dst, 
);
 
Parameters  
 
src
Pointer to a GFL_BITMAP structure.
points
Address of a array of GFL_POINT structure.
num_points
Number of points.
line_width
Width fo the line (1 to 13).
line_color
Pointer to a GFL_COLOR structure.
line_style
Works only with a line width of 1. GFL_LINE_STYLE_SOLID Solid
GFL_LINE_STYLE_DASH Dashes
GFL_LINE_STYLE_DOT Dots
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots


dst  
:src
Address of a pointer to a GFL_BITMAP structure.  
::Pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure.
NULL if on the same instance.  
:points
::Address of a array of GFL_POINT structure.
:num_points
::Number of points.
:line_width
::Width fo the line (1 to 13).
:line_color
::Pointer to a [[Structures#GFL_COLOR|GFL_COLOR]] structure.
:line_style
::Works only with a line width of 1.
::{|
|GFL_LINE_STYLE_SOLID || Solid
|-
|GFL_LINE_STYLE_DASH || Dashes
|-
|GFL_LINE_STYLE_DOT || Dots
|-
|GFL_LINE_STYLE_DASHDOT || Alternating dashes and dots
|-
|GFL_LINE_STYLE_DASHDOTDOT || Alternating dashes and double dots
|}
:dst  
::Address of a pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure. NULL if on the same instance.  


Return value  
'''Return value'''
:The function returns GFL_NO_ERROR if it is successful or a value of [[Error|GFL_ERROR]].


The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


 
== gflDrawRectangleColor ==
See also
 
gflDrawPointColor, gflDrawLineColor, gflDrawRectangleColor, gflDrawPolygonColor, gflDrawCircleColor
 
gflDrawRectangleColor


The gflDrawRectangleColor function allows to draw a rectangle on a picture.  
The gflDrawRectangleColor function allows to draw a rectangle on a picture.  


GFL_ERROR <b>gflDrawRectangleColor</b>(
  GFL_BITMAP* src, 
  GFL_INT32 x, 
  GFL_INT32 y, 
  GFL_INT32 width, 
  GFL_INT32 height, 
  const GFL_COLOR* fill_color, 
  GFL_UINT32 line_width, 
  const GFL_COLOR* line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP** dst, 
);


GFL_ERROR gflDrawRectangleColor(
'''Parameters'''
  GFL_BITMAP * src, 
  GFL_INT32 x, 
  GFL_INT32 y, 
  GFL_INT32 width, 
  GFL_INT32 height, 
  const GFL_COLOR * fill_color, 
  GFL_UINT32 line_width, 
  const GFL_COLOR * line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP ** dst, 
);
 
Parameters  


src  
:src  
Pointer to a GFL_BITMAP structure.  
::Pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure.  
x  
:x  
X start.  
::X start.  
y  
:y  
Y start.  
::Y start.  
width  
:width  
Width of the rectangle.  
::Width of the rectangle.  
height  
:height  
Height of the rectangle.  
::Height of the rectangle.  
fill_color  
:fill_color  
Pointer of a GFL_COLOR structure.  
::Pointer of a [[Structures#GFL_COLOR|GFL_COLOR]] structure.  
If NULL, no fill.  
::If NULL, no fill.  
line_width  
:line_width  
Width of the line (1 to 13).  
::Width of the line (1 to 13).  
line_color  
:line_color  
Pointer of a GFL_COLOR structure.  
::Pointer of a [[Structures#GFL_COLOR|GFL_COLOR]] structure.  
If NULL, no outline.  
::If NULL, no outline.  
line_style  
:line_style  
Works only with a line width of 1. GFL_LINE_STYLE_SOLID Solid  
::Works only with a line width of 1.  
GFL_LINE_STYLE_DASH Dashes  
::{|
GFL_LINE_STYLE_DOT Dots  
|GFL_LINE_STYLE_SOLID || Solid  
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots  
|-
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots  
|GFL_LINE_STYLE_DASH || Dashes  
|-
|GFL_LINE_STYLE_DOT || Dots  
|-
|GFL_LINE_STYLE_DASHDOT || Alternating dashes and dots  
|-
|GFL_LINE_STYLE_DASHDOTDOT || Alternating dashes and double dots  
|}
:dst
::Address of a pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure. NULL if on the same instance.


dst
'''Return value'''
Address of a pointer to a GFL_BITMAP structure.
:The function returns GFL_NO_ERROR if it is successful or a value of [[Error|GFL_ERROR]].  
NULL if on the same instance.  


Return value
The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


 
== gflDrawPolygonColor ==
See also
 
gflDrawPointColor, gflDrawLineColor, gflDrawPolylineColor, gflDrawPolygonColor, gflDrawCircleColor
 
gflDrawPolygonColor


The gflDrawPolygonColor function allows to draw a poylgone on the picture.  
The gflDrawPolygonColor function allows to draw a poylgone on the picture.  


GFL_ERROR <b>gflDrawPolygonColor</b>(
  GFL_BITMAP* src, 
  const GFL_POINT points[], 
  GFL_INT32 num_points, 
  const GFL_COLOR* fill_color, 
  GFL_UINT32 line_width, 
  const GFL_COLOR* line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP** dst, 
);


GFL_ERROR gflDrawPolygonColor(
'''Parameters'''
  GFL_BITMAP * src, 
  const GFL_POINT points[], 
  GFL_INT32 num_points, 
  const GFL_COLOR * fill_color, 
  GFL_UINT32 line_width, 
  const GFL_COLOR * line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP ** dst, 
);
 
Parameters  
 
src
Pointer to a GFL_BITMAP structure.
points
Address to an array of GFL_POINT structure.
Closing the polygone is not necessary.
num_points
Number of points.
fill_color
Pointer to a GFL_COLOR structure.
If NULL, no fill.
line_width
Width of the line (1 to 13).
line_color
Pointer to a GFL_COLOR structure.
If NULL, no outline.
line_style
Works only with a line width of 1. GFL_LINE_STYLE_SOLID Solid
GFL_LINE_STYLE_DASH Dashes
GFL_LINE_STYLE_DOT Dots
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots
 
dst
Address of a pointer to a GFL_BITMAP structure.
NULL if on the same instance.
 
Return value
 
The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


:src
::Pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure.
:points
::Address to an array of [[Structures#GFL_POINT|GFL_POINT]] structure.
::Closing the polygone is not necessary.
:num_points
::Number of points.
:fill_color
::Pointer to a [[Structures#GFL_COLOR|GFL_COLOR]] structure.
::If NULL, no fill.
:line_width
::Width of the line (1 to 13).
:line_color
::Pointer to a [[Structures#GFL_COLOR|GFL_COLOR]] structure.
::If NULL, no outline.
:line_style
::Works only with a line width of 1.
::{|
|GFL_LINE_STYLE_SOLID || Solid
|-
|GFL_LINE_STYLE_DASH || Dashes
|-
|GFL_LINE_STYLE_DOT || Dots
|-
|GFL_LINE_STYLE_DASHDOT || Alternating dashes and dots
|-
|GFL_LINE_STYLE_DASHDOTDOT || Alternating dashes and double dots
|}
:dst
::Address of a pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure. NULL if on the same instance.


See also
'''Return value'''
:The function returns GFL_NO_ERROR if it is successful or a value of [[Error|GFL_ERROR]].


gflDrawPointColor, gflDrawLineColor, gflDrawPolylineColor, gflDrawRectangleColor, gflDrawCircleColor


gflDrawCircleColor
== gflDrawCircleColor ==


The gflDrawCircleColor function allows to draw a circle on a picture.  
The gflDrawCircleColor function allows to draw a circle on a picture.  


GFL_ERROR <b>gflDrawCircleColor</b>(
  GFL_BITMAP* src, 
  GFL_INT32 x, 
  GFL_INT32 y, 
  GFL_INT32 radius, 
  const GFL_COLOR* fill_color, 
  GFL_UINT32 line_width, 
  const GFL_COLOR* line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP** dst, 
);


GFL_ERROR gflDrawCircleColor(
'''Parameters'''
  GFL_BITMAP * src, 
  GFL_INT32 x, 
  GFL_INT32 y, 
  GFL_INT32 redius, 
  const GFL_COLOR * fill_color, 
  GFL_UINT32 line_width, 
  const GFL_COLOR * line_color, 
  GFL_LINE_STYLE line_style, 
  GFL_BITMAP ** dst, 
);
 
Parameters  
 
src
Pointer to a GFL_BITMAP structure.
x
X center.
y
Y center.
radius
Radius of the circle.
fill_color
Pointer to a GFL_COLOR structure.
If NULL, no fill.
line_width
Width of the line (1 to 13).
line_color
Pointer to a GFL_COLOR structure.
If NULL, no outline.
line_style
Works only with a line width of 1. GFL_LINE_STYLE_SOLID Solid
GFL_LINE_STYLE_DASH Dashes
GFL_LINE_STYLE_DOT Dots
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots
 
dst
Address of a pointer to a GFL_BITMAP structure.
NULL if on the same instance.
 
Return value
 
The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.
 
 
See also
 
gflDrawPointColor, gflDrawLineColor, gflDrawPolylineColor, gflDrawPolygonColor, gflDrawRectangleColor,
 
Address of a pointer to a GFL_BITMAP structure.
NULL if on the same instance.
 
Return value
 
The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


:src
::Pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure.
:x
::X center.
:y
::Y center.
:radius
::Radius of the circle.
:fill_color
::Pointer to a [[Structures#GFL_COLOR|GFL_COLOR]] structure.
::If NULL, no fill.
:line_width
::Width of the line (1 to 13).
:line_color
::Pointer to a [[Structures#GFL_COLOR|GFL_COLOR]] structure.
::If NULL, no outline.
:line_style
::Works only with a line width of 1.
::{|
|GFL_LINE_STYLE_SOLID || Solid
|-
|GFL_LINE_STYLE_DASH || Dashes
|-
|GFL_LINE_STYLE_DOT || Dots
|-
|GFL_LINE_STYLE_DASHDOT || Alternating dashes and dots
|-
|GFL_LINE_STYLE_DASHDOTDOT || Alternating dashes and double dots
|}
:dst
::Address of a pointer to a [[Structures#GFL_BITMAP|GFL_BITMAP]] structure. NULL if on the same instance.


See also
'''Return value'''
:The function returns GFL_NO_ERROR if it is successful or a value of [[Error|GFL_ERROR]].


gflDrawLineColor, gflDrawPolylineColor, gflDrawRectangleColor, gflDrawPolygonColor, gflDrawCircleColor
[[Category: GFLSDK Reference Manual]]

Latest revision as of 18:19, 27 April 2010

gflDrawPointColor

The gflDrawPointColor function allows to draw a point on a picture. 

GFL_ERROR gflDrawPointColor(
  GFL_BITMAP* src,  
  GFL_INT32 x,  
  GFL_INT32 y,  
  GFL_UINT32 line_width,  
  const GFL_COLOR* line_color,  
  GFL_BITMAP** dst,  
);

Parameters

src
Pointer to a GFL_BITMAP structure.
x
X position.
y
Y position.
line_width
Width of the point (1 à 13).
line_color
Pointer to a GFL_COLOR structure. Color of the point.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflDrawLineColor

The gflDrawLineColor function allows to draw a line on a picture. 

GFL_ERROR gflDrawLineColor(
  GFL_BITMAP* src,  
  GFL_INT32 x0,  
  GFL_INT32 y0,  
  GFL_INT32 x1,  
  GFL_INT32 y1,  
  GFL_UINT32 line_width,  
  const GFL_COLOR* line_color,  
  GFL_LINE_STYLE line_style,  
  GFL_BITMAP** dst,  
);

Parameters

src
Pointer to a GFL_BITMAP structure.
x0
X start position.
y0
Y start position.
x1
X end position.
y1
Y end position.
line_width
Width of the line (1 to 13).
line_color
Pointer to a GFL_COLOR structure. Color of the line.
line_style
Works only with a line width of 1.
GFL_LINE_STYLE_SOLID Solid
GFL_LINE_STYLE_DASH Dashes
GFL_LINE_STYLE_DOT Dots
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflDrawPolylineColor

The gflDrawPolylineColor function allows to draw a polyline on a picture. 

GFL_ERROR gflDrawPolylineColor(
  GFL_BITMAP* src,  
  const GFL_POINT points[],  
  GFL_INT32 num_points,  
  GFL_UINT32 line_width,  
  const GFL_COLOR* line_color,  
  GFL_LINE_STYLE line_style,  
  GFL_BITMAP** dst,  
);

Parameters

src
Pointer to a GFL_BITMAP structure.
points
Address of a array of GFL_POINT structure.
num_points
Number of points.
line_width
Width fo the line (1 to 13).
line_color
Pointer to a GFL_COLOR structure.
line_style
Works only with a line width of 1.
GFL_LINE_STYLE_SOLID Solid
GFL_LINE_STYLE_DASH Dashes
GFL_LINE_STYLE_DOT Dots
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflDrawRectangleColor

The gflDrawRectangleColor function allows to draw a rectangle on a picture. 

GFL_ERROR gflDrawRectangleColor(
  GFL_BITMAP* src,  
  GFL_INT32 x,  
  GFL_INT32 y,  
  GFL_INT32 width,  
  GFL_INT32 height,  
  const GFL_COLOR* fill_color,  
  GFL_UINT32 line_width,  
  const GFL_COLOR* line_color,  
  GFL_LINE_STYLE line_style,  
  GFL_BITMAP** dst,  
);

Parameters

src
Pointer to a GFL_BITMAP structure.
x
X start.
y
Y start.
width
Width of the rectangle.
height
Height of the rectangle.
fill_color
Pointer of a GFL_COLOR structure.
If NULL, no fill.
line_width
Width of the line (1 to 13).
line_color
Pointer of a GFL_COLOR structure.
If NULL, no outline.
line_style
Works only with a line width of 1.
GFL_LINE_STYLE_SOLID Solid
GFL_LINE_STYLE_DASH Dashes
GFL_LINE_STYLE_DOT Dots
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflDrawPolygonColor

The gflDrawPolygonColor function allows to draw a poylgone on the picture. 

GFL_ERROR gflDrawPolygonColor(
  GFL_BITMAP* src,  
  const GFL_POINT points[],  
  GFL_INT32 num_points,  
  const GFL_COLOR* fill_color,  
  GFL_UINT32 line_width,  
  const GFL_COLOR* line_color,  
  GFL_LINE_STYLE line_style,  
  GFL_BITMAP** dst,  
);

Parameters

src
Pointer to a GFL_BITMAP structure.
points
Address to an array of GFL_POINT structure.
Closing the polygone is not necessary.
num_points
Number of points.
fill_color
Pointer to a GFL_COLOR structure.
If NULL, no fill.
line_width
Width of the line (1 to 13).
line_color
Pointer to a GFL_COLOR structure.
If NULL, no outline.
line_style
Works only with a line width of 1.
GFL_LINE_STYLE_SOLID Solid
GFL_LINE_STYLE_DASH Dashes
GFL_LINE_STYLE_DOT Dots
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflDrawCircleColor

The gflDrawCircleColor function allows to draw a circle on a picture. 

GFL_ERROR gflDrawCircleColor(
  GFL_BITMAP* src,  
  GFL_INT32 x,  
  GFL_INT32 y,  
  GFL_INT32 radius,  
  const GFL_COLOR* fill_color,  
  GFL_UINT32 line_width,  
  const GFL_COLOR* line_color,  
  GFL_LINE_STYLE line_style,  
  GFL_BITMAP** dst,  
);

Parameters

src
Pointer to a GFL_BITMAP structure.
x
X center.
y
Y center.
radius
Radius of the circle.
fill_color
Pointer to a GFL_COLOR structure.
If NULL, no fill.
line_width
Width of the line (1 to 13).
line_color
Pointer to a GFL_COLOR structure.
If NULL, no outline.
line_style
Works only with a line width of 1.
GFL_LINE_STYLE_SOLID Solid
GFL_LINE_STYLE_DASH Dashes
GFL_LINE_STYLE_DOT Dots
GFL_LINE_STYLE_DASHDOT Alternating dashes and dots
GFL_LINE_STYLE_DASHDOTDOT Alternating dashes and double dots
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.
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