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Advanced functions

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gflResize

The gflResize function allows to resize a picture. 

GFL_ERROR gflResize(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_INT32 width,  
  GFL_INT32 height,  
  GFL_UINT32 method,  
  GFL_UINT32 flags
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
width
New width.
height
New height.
method
GFL_RESIZE_QUICK Quick
GFL_RESIZE_BILINEAR Bilinear
flags
Reserved, must be 0.

Return value

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

gflResizeCanvas

The gflResizeCanvas function allows to resize the canvas of a picture. 

GFL_ERROR gflResizeCanvas(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_INT32 width,  
  GFL_INT32 height,  
  GFL_CANVASRESIZE mode,  
  const GFL_COLOR* color
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
width
New width.
height
New height.
mode
GFL_CANVASRESIZE_CENTER Center
GFL_CANVASRESIZE_TOPLEFT Top-Left
GFL_CANVASRESIZE_TOPRIGHT Top-Right
GFL_CANVASRESIZE_BOTTOMLEFT Bottom-Left
GFL_CANVASRESIZE_BOTTOMRIGHT Bottom-Right
color
Pointer to a GFL_COLOR structure to receive the background color.

Return value

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


gflCrop

The gflCrop function crops a picture. 

GFL_ERROR gflCrop(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  const GFL_RECT* rect
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
rect
Crop rectangle.

Return value

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

gflAutoCrop

The gflAutoCrop function performs a automatic crop on a picture. 

GFL_ERROR gflAutoCrop(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  const GFL_COLOR* color, 
  GFL_INT32 tolerance
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
color
Pointer to a GFL_COLOR structure used to set the background color to search.
Can be NULL, the background color is the color at x=0, y=0.
tolerance
Color tolerance.

Return value

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


gflRotate

The gflRotate function applies a rotation on a picture. 

GFL_ERROR gflRotate(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_INT32 angle,  
  const GFL_COLOR* color
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
angle
Angle of rotation in degrees.
color
Pointer to a GFL_COLOR structure used to set the background color.
Can be NULL, the background color is (0,0,0).

Return value

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


gflRotateFine

The gflRotateFine function applies a rotation on a picture. 

GFL_ERROR gflRotateFine(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  double angle,  
  const GFL_COLOR* color
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
angle
Angle of rotation in degrees.
color
Pointer to a GFL_COLOR structure used to set the background color.
Can be NULL, the background color is (0,0,0).

Return value

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

gflFlipHorizontal

The gflFlipHorizontal function applies a horizontal flip on picture. 

GFL_ERROR gflFlipHorizontal(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst
);

Parameters

src
Pointer to a GFL_BITMAP structure.
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.


gflFlipVertical

The gflFlipVertical function applies a vertical flip on picture. 

GFL_ERROR gflFlipVertical(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst
);

Parameters

src
Pointer to a GFL_BITMAP structure.
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.

gflChangeColorDepth

The gflChangeColorDepth function changes the picture type. 

GFL_ERROR gflChangeColorDepth(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_MODE mode,  
  GFL_MODE_PARAMS params
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
mode
GFL_MODE_TO_BINARY Binary (8 bits)
GFL_MODE_TO_4GREY 4 Greyscale (8 bits)
GFL_MODE_TO_8GREY 8 Greyscale (8 bits)
GFL_MODE_TO_16GREY 16 Greyscale (8 bits)
GFL_MODE_TO_32GREY 32 Greyscale (8 bits)
GFL_MODE_TO_64GREY 64 Greyscale (8 bits)
GFL_MODE_TO_128GREY 128 Greyscale (8 bits)
GFL_MODE_TO_216GREY 216 Greyscale (8 bits)
GFL_MODE_TO_256GREY 256 Greyscale (8 bits)
GFL_MODE_TO_8COLORS 8 Colors (8 bits)
GFL_MODE_TO_16COLORS 16 Colors (8 bits)
GFL_MODE_TO_32COLORS 32 Colors (8 bits)
GFL_MODE_TO_64COLORS 64 Colors (8 bits)
GFL_MODE_TO_128GREY 128 Colors (8 bits)
GFL_MODE_TO_216COLORS 216 Colors (8 bits)
GFL_MODE_TO_256COLORS 256 Colors (8 bits)
GFL_MODE_TO_RGB Red-Green-Blue (24 bits)
GFL_MODE_TO_RGBA Red-Green-Blue-Alpha (32 bits)
GFL_MODE_TO_BGR Blue-Green-Red (24 bits)
GFL_MODE_TO_ABGR Alpha-Blue-Green-Red (32 bits)
GFL_MODE_TO_BGRA Blue-Green-Red-Alpha (32 bits)
params
Indicates a dither to be used for colors, greyscale & binary.
GFL_MODE_NO_DITHER No dithering
GFL_MODE_ADAPTIVE Adaptive without dithering
GFL_MODE_PATTERN_DITHER Pattern dithering
GFL_MODE_HALTONE45_DITHER HalfTone 45 dithering
GFL_MODE_HALTONE90_DITHER HalfTone 90 dithering
GFL_MODE_FLOYD_STEINBERG Floyd-Steinberg dithering

Return value

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

gflMerge

The gflMerge function allows to merge a list of picture. 

GFL_ERROR gflMerge(
  const GFL_BITMAP* src[],  
  const GFL_POINT origin[],  
  const GFL_UINT32 opacity[],  
  GFL_INT32  num_bitmap,  
  GFL_BITMAP** dst
);

Parameters

src
Address of an array of pointer to GFL_BITMAP structure.
origin
Address of an array of GFL_POINT structure, origin to insert for each picture.
If NULL, origin used is (0,0).
opacity
Address of an array of opacity, for each picture.
num_bitmap
Number of picture to merge.
dst
Address of a pointer to a GFL_BITMAP structure.

Remark

gflMerge works only in 24 or 32bits.

Return value

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


gflBitblt

The gflBitblt function performs a block transfert between two pictures. 

GFL_ERROR gflBitblt(
  const GFL_BITMAP* src,  
  const GFL_RECT* rect,  
  const GFL_BITMAP* dst,  
  GFL_INT32 x_dest,  
  GFL_INT32 y_dest
);

Parameters

src
Pointer to a GFL_BITMAP structure, used as source.
rect
Pointer to a GFL_RECT structure. Area to copy.
dst
Pointer to a GFL_BITMAP structure, used as destination.
x_dest
X position in the destination picture.
y_dest
Y position in the destination picture.

Return value

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


gflBitbltEx

The gflBitbltEx function performs a block transfert between two pictures with alpha blending. 

GFL_ERROR gflBitbltEx(
  const GFL_BITMAP* src,  
  const GFL_RECT* rect,  
  const GFL_BITMAP* dst,  
  GFL_INT32 x_dest,  
  GFL_INT32 y_dest
);

Parameters

src
Pointer to a GFL_BITMAP structure, used as source. Must be 32bits.
rect
Pointer to a GFL_RECT structure. Area to copy.
dst
Pointer to a GFL_BITMAP structure, used as destination.
x_dest
X position in the destination picture.
y_dest
Y position in the destination picture.

Return value

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

gflGetColorAt

The gflGetColorAt function gets the color at a position of the picture. 

GFL_ERROR gflGetColorAt(
  GFL_BITMAP* src,  
  GFL_INT32 x,  
  GFL_INT32 y,  
  GFL_COLOR* color
);

Parameters

src
Pointer to a GFL_BITMAP structure.
x
X position.
y
Y position.
color
Pointer to a GFL_COLOR structure to obtain the result.

Return value

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


gflSetColorAt

The gflSetColorAt function allows to set a color at a position of the picture. 

GFL_ERROR gflSetColorAt(
  GFL_BITMAP* src,  
  GFL_INT32 x,  
  GFL_INT32 y,  
  const GFL_COLOR* color
);

Parameters

src
Pointer to a GFL_BITMAP structure.
x
X position.
y
Y position.
color
Pointer to a GFL_COLOR structure.

Return value

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