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Finish copy run logic

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2609 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-04-18 01:46:43 +00:00
parent f1fe3b9f88
commit f99686cea4
1 changed files with 223 additions and 46 deletions
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269
graphics/nxglib/nxglib_copyrun.h
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@ -83,68 +83,83 @@ nxgl_copyrun_1bpp(FAR const uint8_t *src, FAR uint8_t *dest,
{
uint8_t indata;
uint8_t outdata;
unsigned int inpixels = 0;
unsigned int outpixels = 0;
unsigned int outbit;
/* Set up the input */
DEBUGASSERT(remainder > 0 && remainder < 8);
/* Take only the first 8-remainder pixels from the first byte.
* remainder is number between 1 and 7 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
indata = *src++;
/* Set up the output */
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 0-(remainder-1)
* are carried over to the first pass through the loop. For
* example if remainder == 2:
*
* indata: xxAA AAAA maps to nextdata: AAAA AAxx
*/
outdata = 0;
outbit = 0;
nextdata = (indata << remainder);
/* Loop until all pixels have been packed into the destination */
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits (7-remainder)-7
* are carried over to the first pass through the loop. For example
* if remainder == 2:
*
* indata: AAAA AAxx maps to nextdata: xxAA AAAA
*/
nextdata = (indata >> remainder);
while (outpixels < npixels && inpixels < npixels)
#endif
/* Loop until all pixels have been packed into the destination. Note:
* a outpixels increments by 8 so a few extra pixels will be packed on
* the output. This should not be an issue.
*/
while (outpixels < npixels)
{
/* Pack pixels from the source into the destination */
/* Check the input bit */
/* Get the next byte from the source */
if ((*src & (1 << inbit)) != 0)
{
/* If it is set, then set the corresponding bit
* in the output (probably not the same bit.
*/
indata = *src++;
outdata = nextdata;
outdata |= (1 << outbit);
}
inpixels++;
/* remainder is number between 1 and 7 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
/* Check if we have used all of the bits in the input */
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits (7-remainder)-7
* are carried over from that last pass through the loop. For
* example if remainder == 2:
*
* nextdata = AAAA AAxx - dest = AAAA AABB
* src = BBCC CCCC - nextdata = CCCC CCxx
*/
if (++inbit >= 8)
{
/* Yes.. Get the next byte from the source and reset
* the source bit number.
*/
outdata |= (indata >> (8 - remainder));
nextdata = (indata << remainder);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 0-(remainder-1)
* are carried over from that last pass through the loop . For
* example if remainder == 2:
*
* nextdata = xxAA AAAA - dest = BBAA AAAA
* src = CCCC CCBB - nextdata = xxCC CCCC
*/
indata = *src++;
inbit = 0;
}
outdata |= (indata << (8 - remainder));
nextdata = (indata >> remainder);
#endif
/* Now check if we have filled the output byte */
/* Transfer the byte to the run buffer */
if (++outbit >= 8)
{
/* Yes.. Write the output and reset the output bit
* number
*/
*dest++ = outdata;
outdata = 0;
outbit = 0;
outpixels += 8;
}
}
/* Handle any bits still in outdata */
if (outpixels < inpixels)
{
*dest = outdata;
*dest++ = outdata;
outpixels += 8;
}
}
@ -153,6 +168,88 @@ static inline void
nxgl_copyrun_2bpp(FAR const uint8_t *src, FAR uint8_t *dest,
unsigned int inbit, size_t npixels)
{
uint8_t indata;
uint8_t outdata;
unsigned int outpixels = 0;
unsigned int shift;
DEBUGASSERT(remainder > 0 && remainder < 4);
/* Take only the first 8-(2*remainder) pixels from the first byte.
* remainder is number between 1 and 3 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
indata = *src++;
shift = (remainder << 1);
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 0-(2*remainder-1)
* are carried over to the first pass through the loop. For
* example if remainder == 1:
*
* indata: xxAA AAAA maps to nextdata: AAAA AAxx
*/
nextdata = (indata << shift);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits (7-2*remainder)-7
* are carried over to the first pass through the loop. For example
* if remainder == 1:
*
* indata: AAAA AAxx maps to nextdata: xxAA AAAA
*/
nextdata = (indata >> shift);
#endif
/* Loop until all pixels have been packed into the destination. Note:
* a outpixels increments by 8 so a few extra pixels will be packed on
* the output. This should not be an issue.
*/
while (outpixels < npixels)
{
/* Get the next byte from the source */
indata = *src++;
outdata = nextdata;
/* remainder is number between 1 and 3 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits (7-2*remainder)-7
* are carried over from that last pass through the loop. For example
* if remainder == 1:
*
* nextdata = AAAA AAxx - dest = AAAA AABB
* src = BBCC CCCC - nextdata = CCCC CCxx
*/
outdata |= (indata >> (8 - shift));
nextdata = (indata << shift);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 0-(2*remainder-1)
* are carried over from that last pass through the loop. For example
* if remainder == 1:
*
* nextdata = xxAA AAAA - dest = BBAA AAAA
* src = CCCC CCBB - nextdata = xxCC CCCC
*/
outdata |= (indata << (8 - shift));
nextdata = (indata >> shift);
#endif
/* Transfer the byte to the run buffer */
*dest++ = outdata;
outpixels += 4;
}
}
#elif NXGLIB_BITSPERPIXEL == 4
@ -160,6 +257,86 @@ static inline void
nxgl_copyrun_4bpp(FAR const uint8_t *src, FAR uint8_t *dest,
unsigned int inbit, size_t npixels)
{
uint8_t indata;
uint8_t outdata;
unsigned int outpixels = 0;
DEBUGASSERT(remainder == 1);
/* Take only the first 8-remainder pixels from the first byte.
* remainder is number between 1 and 3 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
indata = *src++;
shift = (remainder << 1);
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 0-3
* are carried over to the first pass through the loop. For
* example:
*
* indata: xxxx AAAA maps to nextdata: AAAA xxxx
*/
nextdata = (indata << 4);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 4-7
* are carried over to the first pass through the loop. For example:
*
* indata: AAAA xxxx maps to nextdata: xxxx AAAA
*/
nextdata = (indata >> 4);
#endif
/* Loop until all pixels have been packed into the destination. Note:
* a outpixels increments by 8 so a few extra pixels will be packed on
* the output. This should not be an issue.
*/
while (outpixels < npixels)
{
/* Get the next byte from the source */
indata = *src++;
outdata = nextdata;
/* remainder is number between 1 and 3 (not zero!) that represents
* the alignment of the pixel bits in the source.
*/
#ifdef CONFIG_NX_PACKEDMSFIRST
/* If CONFIG_NX_PACKEDMSFIRST is defined, then bits 4-7
* are carried over from that last pass through the loop (or are
* ignored initially. For example if remainder == 1:
*
* nextdata = AAAA xxxx - dest = AAAA BBBB
* src = BBBB CCCC - nextdata = CCCC xxxx
*/
outdata |= (indata >> 4);
nextdata = (indata << 4);
#else
/* If CONFIG_NX_PACKEDMSFIRST is NOT defined, then bits 0-(remainder-1)
* are carried over from that last pass through the loop (or are
* ignored initially). For example if remainder == 2:
*
* nextdata = xxAA AAAA - dest = BBAA AAAA
* src = CCCC CCBB - nextdata = xxCC CCCC
*/
outdata |= (indata << 4);
nextdata = (indata >> 4);
#endif
/* Transfer the byte to the run buffer */
*dest++ = outdata;
outpixels += 2;
}
}
#endif
#endif /* __GRAPHICS_NXGLIB_NXGLIB_COPYRUN_H */