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magicard: Implement the image data packing and K extraction.

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Nothing ties into it yet.  Still need to parse the incoming job.
This commit is contained in:
Solomon Peachy 2017-11-15 07:47:44 -05:00
parent 1ee73921d0
commit ab84d581b0
1 changed files with 80 additions and 3 deletions
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83
backend_magicard.c
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@ -308,7 +308,75 @@ static void magicard_teardown(void *vctx) {
free(ctx);
}
#define MAX_PRINTJOB_LEN 5218176 + 20*1024 /* 1016*642 * 4color * 2sides */
static void downscale_and_extract(uint32_t pixels,
uint8_t *y_i, uint8_t *m_i, uint8_t *c_i,
uint8_t *y_o, uint8_t *m_o, uint8_t *c_o, uint8_t *k_o)
{
uint32_t i;
uint8_t k_shift;
for (i = 0 ; i < pixels; i++)
{
uint8_t y, m, c;
uint8_t k = 0;
/* Downscale color planes from 8bpp -> 6bpp; */
y = *y_i++ >> 2;
m = *m_i++ >> 2;
c = *c_i++ >> 2;
/* Extract "true black" from ymc data, if enabled */
if (k_o && y == 0x3f && m == 0x3f && c == 0x3f) {
k = 1;
y = m = c = 0;
}
/* pack new YMC data from 8bpp to 6bpp. 4 bytes into 3. */
switch (i & 3) {
case 0:
*y_o = ((y & 0x3f) << 2);
*m_o = ((m & 0x3f) << 2);
*c_o = ((c & 0x3f) << 2);
break;
case 1:
*y_o++ |= (y >> 4) & 0x3;
*m_o++ |= (m >> 4) & 0x3;
*c_o++ |= (c >> 4) & 0x3;
*y_o = ((y & 0xf) << 4);
*m_o = ((m & 0xf) << 4);
*c_o = ((c & 0xf) << 4);
break;
case 2:
*y_o++ |= (y >> 2) & 0xf;
*m_o++ |= (m >> 2) & 0xf;
*c_o++ |= (c >> 2) & 0xf;
*y_o = ((y & 0x3) << 6);
*m_o = ((m & 0x3) << 6);
*c_o = ((c & 0x3) << 6);
break;
case 3:
*y_o++ |= (y & 0x3f);
*m_o++ |= (m & 0x3f);
*c_o++ |= (c & 0x3f);
break;
}
/* And resin black, if enabled */
if (k_o) {
if (k_shift == 0)
*k_o = 0;
*k_o |= (k << k_shift++);
if (k_shift == 8) {
k_shift = 0;
k_o++;
}
}
}
}
#define MAX_PRINTJOB_LEN 5462016 + 20*1024 /* 1016*672 * 4color * 2sides */
static int magicard_read_parse(void *vctx, int data_fd) {
struct magicard_ctx *ctx = vctx;
int run = 1;
@ -330,14 +398,23 @@ static int magicard_read_parse(void *vctx, int data_fd) {
return CUPS_BACKEND_FAILED;
}
// read 64 * 0x5a bytes into buffer.
// read until we hit 0x1c (end of stream) to get full command list.
// parse out SZ[BGRK].
while(run) {
// int i;
// cmd stream is 64 * 0x5a, followed by comma-separated
// commands. end of command list is 0x1c.
// then bulk data appended, using lengths specified in
// SZB, SZG, SZR, SZK.
// at end, 0x1c.
// Then one final command: 0x4b, 0x3a, 0x03. 'K:'
// at end, 0x1c.
// look for X-GP-8 "command" and strip it out.
// if set, we have to modify the SZB/G/R to convert 8bpp -> 6bpp.
// look for X-GP-RK, and if present, generate 1bpp K plane!
//
// Each image data plane ends with with 0x1c [XX] 3a.
// Entire stream ends with 0x03.
}
return CUPS_BACKEND_OK;