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How to read GetDeviceCaps() return values?
I am new to Windows API and I just can't seem to figure this out:
According to the documentation the function int GetDeviceCaps(HDC hdc,int index); returns integer values which correspond to the selected item I want to know about. However, how am I supposed to convert the integers to the values?
printf("Rastercaps: %dn", GetDeviceCaps(hdc, RASTERCAPS));
// rastercaps: 32409
item RASTERCAPS:
values
- RC_BANDING Requires banding support.
- RC_BITBLT Capable of transferring bitmaps.
- RC_BITMAP64 Capable of supporting bitmaps larger than 64 KB.
- RC_DI_BITMAP Capable of supporting the SetDIBits and GetDIBits
functions. - RC_DIBTODEV Capable of supporting the SetDIBitsToDevice
function. - RC_FLOODFILL Capable of performing flood fills.
...
Does 32409 mean the device has RASTERCAP values (capabilities) 3,2,4,0 and 9, in the order as stated in their table?
Thank you.
windows
asked Nov 19 '18 at 14:34
thehorseisbrown
257
add a comment |
I am new to Windows API and I just can't seem to figure this out:
According to the documentation the function int GetDeviceCaps(HDC hdc,int index); returns integer values which correspond to the selected item I want to know about. However, how am I supposed to convert the integers to the values?
printf("Rastercaps: %dn", GetDeviceCaps(hdc, RASTERCAPS));
// rastercaps: 32409
item RASTERCAPS:
values
- RC_BANDING Requires banding support.
- RC_BITBLT Capable of transferring bitmaps.
- RC_BITMAP64 Capable of supporting bitmaps larger than 64 KB.
- RC_DI_BITMAP Capable of supporting the SetDIBits and GetDIBits
functions. - RC_DIBTODEV Capable of supporting the SetDIBitsToDevice
function. - RC_FLOODFILL Capable of performing flood fills.
...
Does 32409 mean the device has RASTERCAP values (capabilities) 3,2,4,0 and 9, in the order as stated in their table?
Thank you.
windows
asked Nov 19 '18 at 14:34
thehorseisbrown
257
This is a bit field so you have to use binary! 32409 = 111111010011001b, so the bits with values 1, 8, 16, 128, 512, 1024, 2048, 4096, 8192, and 16384 are set. To see if a particular bit it set, use the "and" operator.
– Andreas Rejbrand
Nov 19 '18 at 14:52
add a comment |
I am new to Windows API and I just can't seem to figure this out:
According to the documentation the function int GetDeviceCaps(HDC hdc,int index); returns integer values which correspond to the selected item I want to know about. However, how am I supposed to convert the integers to the values?
printf("Rastercaps: %dn", GetDeviceCaps(hdc, RASTERCAPS));
// rastercaps: 32409
item RASTERCAPS:
values
- RC_BANDING Requires banding support.
- RC_BITBLT Capable of transferring bitmaps.
- RC_BITMAP64 Capable of supporting bitmaps larger than 64 KB.
- RC_DI_BITMAP Capable of supporting the SetDIBits and GetDIBits
functions. - RC_DIBTODEV Capable of supporting the SetDIBitsToDevice
function. - RC_FLOODFILL Capable of performing flood fills.
...
Does 32409 mean the device has RASTERCAP values (capabilities) 3,2,4,0 and 9, in the order as stated in their table?
Thank you.
windows
asked Nov 19 '18 at 14:34
thehorseisbrown
257
I am new to Windows API and I just can't seem to figure this out:
According to the documentation the function int GetDeviceCaps(HDC hdc,int index); returns integer values which correspond to the selected item I want to know about. However, how am I supposed to convert the integers to the values?
printf("Rastercaps: %dn", GetDeviceCaps(hdc, RASTERCAPS));
// rastercaps: 32409
item RASTERCAPS:
values
- RC_BANDING Requires banding support.
- RC_BITBLT Capable of transferring bitmaps.
- RC_BITMAP64 Capable of supporting bitmaps larger than 64 KB.
- RC_DI_BITMAP Capable of supporting the SetDIBits and GetDIBits
functions. - RC_DIBTODEV Capable of supporting the SetDIBitsToDevice
function. - RC_FLOODFILL Capable of performing flood fills.
...
Does 32409 mean the device has RASTERCAP values (capabilities) 3,2,4,0 and 9, in the order as stated in their table?
Thank you.
windows
windows
asked Nov 19 '18 at 14:34
thehorseisbrown
257
asked Nov 19 '18 at 14:34
thehorseisbrown
257
asked Nov 19 '18 at 14:34
thehorseisbrown
257
asked Nov 19 '18 at 14:34
thehorseisbrown
257
asked Nov 19 '18 at 14:34
thehorseisbrown
257
257
This is a bit field so you have to use binary! 32409 = 111111010011001b, so the bits with values 1, 8, 16, 128, 512, 1024, 2048, 4096, 8192, and 16384 are set. To see if a particular bit it set, use the "and" operator.
– Andreas Rejbrand
Nov 19 '18 at 14:52
add a comment |
This is a bit field so you have to use binary! 32409 = 111111010011001b, so the bits with values 1, 8, 16, 128, 512, 1024, 2048, 4096, 8192, and 16384 are set. To see if a particular bit it set, use the "and" operator.
– Andreas Rejbrand
Nov 19 '18 at 14:52
This is a bit field so you have to use binary! 32409 = 111111010011001b, so the bits with values 1, 8, 16, 128, 512, 1024, 2048, 4096, 8192, and 16384 are set. To see if a particular bit it set, use the "and" operator.
– Andreas Rejbrand
Nov 19 '18 at 14:52
This is a bit field so you have to use binary! 32409 = 111111010011001b, so the bits with values 1, 8, 16, 128, 512, 1024, 2048, 4096, 8192, and 16384 are set. To see if a particular bit it set, use the "and" operator.
– Andreas Rejbrand
Nov 19 '18 at 14:52
add a comment |
1 Answer
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oldest
votes
They're bitmasks. In the relevant C header file (wingdi.h) there is
/* Raster Capabilities */
#define RC_NONE
#define RC_BITBLT 1 /* Can do standard BLT. */
#define RC_BANDING 2 /* Device requires banding support */
#define RC_SCALING 4 /* Device requires scaling support */
#define RC_BITMAP64 8 /* Device can support >64K bitmap */
...and many more.
The return value (32409) is made up of the bitwise-or of these values. So, for example, if you wanted to know if the device could support >64K bitmap you would do
int rc = GetDeviceCaps(hdc, RASTERCAPS);
if (rc & RC_BITMAP64) { /* it does support >64k */ }
So in this case, 32409 is 0111111010011001 in binary which means it has the capabilities RC_BITBLT | RC_BITMAP64 | RC_GDI20_OUTPUT | RC_DI_BITMAP |
RC_DIBTODEV | RC_BIGFONT | RC_STRETCHBLT | RC_FLOODFILL | RC_STRETCHDIB | RC_OP_DX_OUTPUT.
See "Bitwise operations in C"
answered Nov 19 '18 at 14:40
Peter Hull
2,89522331
add a comment |
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1 Answer
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oldest
votes
1 Answer
1
active
oldest
votes
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oldest
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active
oldest
votes
They're bitmasks. In the relevant C header file (wingdi.h) there is
/* Raster Capabilities */
#define RC_NONE
#define RC_BITBLT 1 /* Can do standard BLT. */
#define RC_BANDING 2 /* Device requires banding support */
#define RC_SCALING 4 /* Device requires scaling support */
#define RC_BITMAP64 8 /* Device can support >64K bitmap */
...and many more.
The return value (32409) is made up of the bitwise-or of these values. So, for example, if you wanted to know if the device could support >64K bitmap you would do
int rc = GetDeviceCaps(hdc, RASTERCAPS);
if (rc & RC_BITMAP64) { /* it does support >64k */ }
So in this case, 32409 is 0111111010011001 in binary which means it has the capabilities RC_BITBLT | RC_BITMAP64 | RC_GDI20_OUTPUT | RC_DI_BITMAP |
RC_DIBTODEV | RC_BIGFONT | RC_STRETCHBLT | RC_FLOODFILL | RC_STRETCHDIB | RC_OP_DX_OUTPUT.
See "Bitwise operations in C"
answered Nov 19 '18 at 14:40
Peter Hull
2,89522331
add a comment |
They're bitmasks. In the relevant C header file (wingdi.h) there is
/* Raster Capabilities */
#define RC_NONE
#define RC_BITBLT 1 /* Can do standard BLT. */
#define RC_BANDING 2 /* Device requires banding support */
#define RC_SCALING 4 /* Device requires scaling support */
#define RC_BITMAP64 8 /* Device can support >64K bitmap */
...and many more.
The return value (32409) is made up of the bitwise-or of these values. So, for example, if you wanted to know if the device could support >64K bitmap you would do
int rc = GetDeviceCaps(hdc, RASTERCAPS);
if (rc & RC_BITMAP64) { /* it does support >64k */ }
So in this case, 32409 is 0111111010011001 in binary which means it has the capabilities RC_BITBLT | RC_BITMAP64 | RC_GDI20_OUTPUT | RC_DI_BITMAP |
RC_DIBTODEV | RC_BIGFONT | RC_STRETCHBLT | RC_FLOODFILL | RC_STRETCHDIB | RC_OP_DX_OUTPUT.
See "Bitwise operations in C"
answered Nov 19 '18 at 14:40
Peter Hull
2,89522331
add a comment |
They're bitmasks. In the relevant C header file (wingdi.h) there is
/* Raster Capabilities */
#define RC_NONE
#define RC_BITBLT 1 /* Can do standard BLT. */
#define RC_BANDING 2 /* Device requires banding support */
#define RC_SCALING 4 /* Device requires scaling support */
#define RC_BITMAP64 8 /* Device can support >64K bitmap */
...and many more.
The return value (32409) is made up of the bitwise-or of these values. So, for example, if you wanted to know if the device could support >64K bitmap you would do
int rc = GetDeviceCaps(hdc, RASTERCAPS);
if (rc & RC_BITMAP64) { /* it does support >64k */ }
So in this case, 32409 is 0111111010011001 in binary which means it has the capabilities RC_BITBLT | RC_BITMAP64 | RC_GDI20_OUTPUT | RC_DI_BITMAP |
RC_DIBTODEV | RC_BIGFONT | RC_STRETCHBLT | RC_FLOODFILL | RC_STRETCHDIB | RC_OP_DX_OUTPUT.
See "Bitwise operations in C"
answered Nov 19 '18 at 14:40
Peter Hull
2,89522331
They're bitmasks. In the relevant C header file (wingdi.h) there is
/* Raster Capabilities */
#define RC_NONE
#define RC_BITBLT 1 /* Can do standard BLT. */
#define RC_BANDING 2 /* Device requires banding support */
#define RC_SCALING 4 /* Device requires scaling support */
#define RC_BITMAP64 8 /* Device can support >64K bitmap */
...and many more.
The return value (32409) is made up of the bitwise-or of these values. So, for example, if you wanted to know if the device could support >64K bitmap you would do
int rc = GetDeviceCaps(hdc, RASTERCAPS);
if (rc & RC_BITMAP64) { /* it does support >64k */ }
So in this case, 32409 is 0111111010011001 in binary which means it has the capabilities RC_BITBLT | RC_BITMAP64 | RC_GDI20_OUTPUT | RC_DI_BITMAP |
RC_DIBTODEV | RC_BIGFONT | RC_STRETCHBLT | RC_FLOODFILL | RC_STRETCHDIB | RC_OP_DX_OUTPUT.
See "Bitwise operations in C"
answered Nov 19 '18 at 14:40
Peter Hull
2,89522331
edited Nov 19 '18 at 14:47
answered Nov 19 '18 at 14:40
Peter Hull
2,89522331
answered Nov 19 '18 at 14:40
Peter Hull
2,89522331
answered Nov 19 '18 at 14:40
Peter Hull
2,89522331
2,89522331
add a comment |
add a comment |
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This is a bit field so you have to use binary! 32409 = 111111010011001b, so the bits with values 1, 8, 16, 128, 512, 1024, 2048, 4096, 8192, and 16384 are set. To see if a particular bit it set, use the "and" operator.
– Andreas Rejbrand
Nov 19 '18 at 14:52