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new API: LoadBitmapEx2

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This commit is contained in:
Vincent Wei
2020-01-09 12:12:18 +08:00
parent dd21dbdde7
commit 582ed130a7
1 changed files with 51 additions and 3 deletions
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include/gdi.h
+51 -3
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@@ -10492,6 +10492,14 @@ struct _BITMAP
#include <stdio.h>
#include "endianrw.h"
/**
* \var typedef void (* CB_ALLOC_BITMAP_BUFF) (void* context, BITMAP* bmp)
* \brief The type of callback to allocate pixel buffer for BITMAP object.
*
* Return TRUE for success, otherwise FALSE.
*/
typedef BOOL (* CB_ALLOC_BITMAP_BUFF) (void* context, BITMAP* bmp);
/**
* \var typedef void (* CB_ONE_SCANLINE) (void* context, MYBITMAP* my_bmp, int y)
* \brief The type of scanline loaded callback.
@@ -10628,7 +10636,6 @@ MG_EXPORT BOOL GUIAPI mlsGetSlaveScreenInfo (HDC dc_mls, DWORD mask, int* offset
*/
MG_EXPORT BOOL GUIAPI mlsEnableSlaveScreen (HDC dc_mls, BOOL enable);
#define ERR_BMP_OK 0
#define ERR_BMP_IMAGE_TYPE -1
#define ERR_BMP_UNKNOWN_TYPE -2
@@ -10640,6 +10647,45 @@ MG_EXPORT BOOL GUIAPI mlsEnableSlaveScreen (HDC dc_mls, BOOL enable);
#define ERR_BMP_FILEIO -8
#define ERR_BMP_OTHER -9
#define ERR_BMP_ERROR_SOURCE -10
/**
* \fn int GUIAPI LoadBitmapEx2 (HDC hdc, PBITMAP pBitmap,
MG_RWops* area, const char* ext,
CB_ALLOC_BITMAP_BUFF cb_alloc_buff, void* context)
* \brief Loads a device-dependent bitmap from a general data source.
*
* This function loads a device-dependent bitmap from the data source \a area.
* This function gives a chance to the caller to allocate the pixel buffer
* of the BITMAP object in a different way.
*
* \param hdc The device context.
* \param pBitmap The pointer to the BITMAP object.
* \param area The data source.
* \param ext The extension of the type of this bitmap.
* \param cb_alloc_buff The callback to allocate the buffer for the pixels.
* If it is NULL, the function will allocate the buffer by calling malloc.
* \param context The context will be passed to the \a cb_alloc_buff.
*
* \return 0 on success, less than 0 on error.
*
* \retval ERR_BMP_OK Loading successfully
* \retval ERR_BMP_IMAGE_TYPE Not a valid bitmap.
* \retval ERR_BMP_UNKNOWN_TYPE Not recongnized bitmap type.
* \retval ERR_BMP_CANT_READ Read error.
* \retval ERR_BMP_CANT_SAVE Save error.
* \retval ERR_BMP_NOT_SUPPORTED Not supported bitmap type.
* \retval ERR_BMP_MEM Memory allocation error.
* \retval ERR_BMP_LOAD Loading error.
* \retval ERR_BMP_FILEIO I/O failed.
* \retval ERR_BMP_OTHER Other error.
* \retval ERR_BMP_ERROR_SOURCE A error data source.
*
* \sa LoadBitmapFromFile, LoadBitmapFromMem, CB_ALLOC_BITMAP_BUFF
*/
MG_EXPORT int GUIAPI LoadBitmapEx2 (HDC hdc, PBITMAP pBitmap,
MG_RWops* area, const char* ext,
CB_ALLOC_BITMAP_BUFF cb_alloc_buff, void* context);
/**
* \fn int GUIAPI LoadBitmapEx (HDC hdc, PBITMAP pBitmap, \
MG_RWops* area, const char* ext)
@@ -10667,8 +10713,10 @@ MG_EXPORT BOOL GUIAPI mlsEnableSlaveScreen (HDC dc_mls, BOOL enable);
*
* \sa LoadBitmapFromFile, LoadBitmapFromMem
*/
MG_EXPORT int GUIAPI LoadBitmapEx (HDC hdc, PBITMAP pBitmap,
MG_RWops* area, const char* ext);
static inline int LoadBitmapEx (HDC hdc, PBITMAP pBitmap,
MG_RWops* area, const char* ext) {
return LoadBitmapEx2 (hdc, pBitmap, area, ext, NULL, NULL);
}
/**
* \fn int GUIAPI LoadBitmapFromFile (HDC hdc, PBITMAP pBitmap, \