videoscale: Implement 4-tap scaling for RGB565 and RGB555

This commit is contained in:
Sebastian Dröge 2009-03-27 13:14:00 +01:00
parent c1653fc5b0
commit 77795ac240
2 changed files with 383 additions and 0 deletions

View file

@ -699,3 +699,373 @@ vs_image_scale_4tap_UYVY (const VSImage * dest, const VSImage * src,
yacc += y_increment; yacc += y_increment;
} }
} }
/* note that src and dest are uint16_t, and thus endian dependent */
#define RGB565_R(x) (((x)&0xf800)>>8 | ((x)&0xf800)>>13)
#define RGB565_G(x) (((x)&0x07e0)>>3 | ((x)&0x07e0)>>9)
#define RGB565_B(x) (((x)&0x001f)<<3 | ((x)&0x001f)>>2)
#define RGB565(r,g,b) \
((((r)<<8)&0xf800) | (((g)<<3)&0x07e0) | (((b)>>3)&0x001f))
void
vs_scanline_resample_4tap_RGB565 (uint8_t * dest_u8, uint8_t * src_u8,
int n, int src_width, int *xacc, int increment)
{
int i;
int j;
int acc;
int x;
int y, y_r, y_b, y_g;
uint16_t *dest = (uint16_t *) dest_u8;
uint16_t *src = (uint16_t *) src_u8;
acc = *xacc;
for (i = 0; i < n; i++) {
j = acc >> 16;
x = acc & 0xffff >> 8;
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * RGB565_R (src[MAX ((j - 1), 0)]);
y += vs_4tap_taps[x][1] * RGB565_R (src[j]);
y += vs_4tap_taps[x][2] * RGB565_R (src[(j + 1)]);
y += vs_4tap_taps[x][3] * RGB565_R (src[(j + 2)]);
} else {
y = vs_4tap_taps[x][0] * RGB565_R (src[CLAMP ((j - 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][1] * RGB565_R (src[CLAMP (j, 0, src_width - 1)]);
y += vs_4tap_taps[x][2] * RGB565_R (src[CLAMP ((j + 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][3] * RGB565_R (src[CLAMP ((j + 2), 0,
src_width - 1)]);
}
y += (1 << (SHIFT - 1));
y_r = CLAMP (y >> SHIFT, 0, 255);
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * RGB565_G (src[MAX ((j - 1), 0)]);
y += vs_4tap_taps[x][1] * RGB565_G (src[j]);
y += vs_4tap_taps[x][2] * RGB565_G (src[(j + 1)]);
y += vs_4tap_taps[x][3] * RGB565_G (src[(j + 2)]);
} else {
y = vs_4tap_taps[x][0] * RGB565_G (src[CLAMP ((j - 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][1] * RGB565_G (src[CLAMP (j, 0, src_width - 1)]);
y += vs_4tap_taps[x][2] * RGB565_G (src[CLAMP ((j + 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][3] * RGB565_G (src[CLAMP ((j + 2), 0,
src_width - 1)]);
}
y += (1 << (SHIFT - 1));
y_g = CLAMP (y >> SHIFT, 0, 255);
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * RGB565_B (src[MAX ((j - 1), 0)]);
y += vs_4tap_taps[x][1] * RGB565_B (src[j]);
y += vs_4tap_taps[x][2] * RGB565_B (src[(j + 1)]);
y += vs_4tap_taps[x][3] * RGB565_B (src[(j + 2)]);
} else {
y = vs_4tap_taps[x][0] * RGB565_B (src[CLAMP ((j - 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][1] * RGB565_B (src[CLAMP (j, 0, src_width - 1)]);
y += vs_4tap_taps[x][2] * RGB565_B (src[CLAMP ((j + 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][3] * RGB565_B (src[CLAMP ((j + 2), 0,
src_width - 1)]);
}
y += (1 << (SHIFT - 1));
y_b = CLAMP (y >> SHIFT, 0, 255);
dest[i] = RGB565 (y_r, y_b, y_g);
acc += increment;
}
*xacc = acc;
}
void
vs_scanline_merge_4tap_RGB565 (uint8_t * dest_u8, uint8_t * src1_u8,
uint8_t * src2_u8, uint8_t * src3_u8, uint8_t * src4_u8, int n, int acc)
{
int i;
int y, y_r, y_b, y_g;
int a, b, c, d;
uint16_t *dest = (uint16_t *) dest_u8;
uint16_t *src1 = (uint16_t *) src1_u8;
uint16_t *src2 = (uint16_t *) src2_u8;
uint16_t *src3 = (uint16_t *) src3_u8;
uint16_t *src4 = (uint16_t *) src4_u8;
acc = (acc >> 8) & 0xff;
a = vs_4tap_taps[acc][0];
b = vs_4tap_taps[acc][1];
c = vs_4tap_taps[acc][2];
d = vs_4tap_taps[acc][3];
for (i = 0; i < n; i++) {
y = a * RGB565_R (src1[i]);
y += b * RGB565_R (src2[i]);
y += c * RGB565_R (src3[i]);
y += d * RGB565_R (src4[i]);
y += (1 << (SHIFT - 1));
y_r = CLAMP (y >> SHIFT, 0, 255);
y = a * RGB565_G (src1[i]);
y += b * RGB565_G (src2[i]);
y += c * RGB565_G (src3[i]);
y += d * RGB565_G (src4[i]);
y += (1 << (SHIFT - 1));
y_g = CLAMP (y >> SHIFT, 0, 255);
y = a * RGB565_B (src1[i]);
y += b * RGB565_B (src2[i]);
y += c * RGB565_B (src3[i]);
y += d * RGB565_B (src4[i]);
y += (1 << (SHIFT - 1));
y_b = CLAMP (y >> SHIFT, 0, 255);
dest[i] = RGB565 (y_r, y_b, y_g);
}
}
void
vs_image_scale_4tap_RGB565 (const VSImage * dest, const VSImage * src,
uint8_t * tmpbuf)
{
int yacc;
int y_increment;
int x_increment;
int i;
int j;
int xacc;
int k;
if (dest->height == 1)
y_increment = 0;
else
y_increment = ((src->height - 1) << 16) / (dest->height - 1);
if (dest->width == 1)
x_increment = 0;
else
x_increment = ((src->width - 1) << 16) / (dest->width - 1);
k = 0;
for (i = 0; i < 4; i++) {
xacc = 0;
vs_scanline_resample_4tap_RGB565 (tmpbuf + i * dest->stride,
src->pixels + i * src->stride, dest->width, src->width,
&xacc, x_increment);
}
yacc = 0;
for (i = 0; i < dest->height; i++) {
uint8_t *t0, *t1, *t2, *t3;
j = yacc >> 16;
while (j > k) {
k++;
if (k + 3 < src->height) {
xacc = 0;
vs_scanline_resample_4tap_RGB565 (tmpbuf + ((k + 3) & 3) * dest->stride,
src->pixels + (k + 3) * src->stride,
dest->width, src->width, &xacc, x_increment);
}
}
t0 = tmpbuf + (CLAMP (j - 1, 0, src->height - 1) & 3) * dest->stride;
t1 = tmpbuf + (CLAMP (j, 0, src->height - 1) & 3) * dest->stride;
t2 = tmpbuf + (CLAMP (j + 1, 0, src->height - 1) & 3) * dest->stride;
t3 = tmpbuf + (CLAMP (j + 2, 0, src->height - 1) & 3) * dest->stride;
vs_scanline_merge_4tap_RGB565 (dest->pixels + i * dest->stride,
t0, t1, t2, t3, dest->width, yacc & 0xffff);
yacc += y_increment;
}
}
/* note that src and dest are uint16_t, and thus endian dependent */
#define RGB555_R(x) (((x)&0x7c00)>>8 | ((x)&0x7c00)>>13)
#define RGB555_G(x) (((x)&0x03e0)>>3 | ((x)&0x03e0)>>9)
#define RGB555_B(x) (((x)&0x001f)<<3 | ((x)&0x001f)>>2)
#define RGB555(r,g,b) \
((((r)<<7)&0x7c00) | (((g)<<3)&0x03e0) | (((b)>>3)&0x001f))
void
vs_scanline_resample_4tap_RGB555 (uint8_t * dest_u8, uint8_t * src_u8,
int n, int src_width, int *xacc, int increment)
{
int i;
int j;
int acc;
int x;
int y, y_r, y_b, y_g;
uint16_t *dest = (uint16_t *) dest_u8;
uint16_t *src = (uint16_t *) src_u8;
acc = *xacc;
for (i = 0; i < n; i++) {
j = acc >> 16;
x = acc & 0xffff >> 8;
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * RGB555_R (src[MAX ((j - 1), 0)]);
y += vs_4tap_taps[x][1] * RGB555_R (src[j]);
y += vs_4tap_taps[x][2] * RGB555_R (src[(j + 1)]);
y += vs_4tap_taps[x][3] * RGB555_R (src[(j + 2)]);
} else {
y = vs_4tap_taps[x][0] * RGB555_R (src[CLAMP ((j - 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][1] * RGB555_R (src[CLAMP (j, 0, src_width - 1)]);
y += vs_4tap_taps[x][2] * RGB555_R (src[CLAMP ((j + 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][3] * RGB555_R (src[CLAMP ((j + 2), 0,
src_width - 1)]);
}
y += (1 << (SHIFT - 1));
y_r = CLAMP (y >> SHIFT, 0, 255);
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * RGB555_G (src[MAX ((j - 1), 0)]);
y += vs_4tap_taps[x][1] * RGB555_G (src[j]);
y += vs_4tap_taps[x][2] * RGB555_G (src[(j + 1)]);
y += vs_4tap_taps[x][3] * RGB555_G (src[(j + 2)]);
} else {
y = vs_4tap_taps[x][0] * RGB555_G (src[CLAMP ((j - 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][1] * RGB555_G (src[CLAMP (j, 0, src_width - 1)]);
y += vs_4tap_taps[x][2] * RGB555_G (src[CLAMP ((j + 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][3] * RGB555_G (src[CLAMP ((j + 2), 0,
src_width - 1)]);
}
y += (1 << (SHIFT - 1));
y_g = CLAMP (y >> SHIFT, 0, 255);
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * RGB555_B (src[MAX ((j - 1), 0)]);
y += vs_4tap_taps[x][1] * RGB555_B (src[j]);
y += vs_4tap_taps[x][2] * RGB555_B (src[(j + 1)]);
y += vs_4tap_taps[x][3] * RGB555_B (src[(j + 2)]);
} else {
y = vs_4tap_taps[x][0] * RGB555_B (src[CLAMP ((j - 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][1] * RGB555_B (src[CLAMP (j, 0, src_width - 1)]);
y += vs_4tap_taps[x][2] * RGB555_B (src[CLAMP ((j + 1), 0,
src_width - 1)]);
y += vs_4tap_taps[x][3] * RGB555_B (src[CLAMP ((j + 2), 0,
src_width - 1)]);
}
y += (1 << (SHIFT - 1));
y_b = CLAMP (y >> SHIFT, 0, 255);
dest[i] = RGB555 (y_r, y_b, y_g);
acc += increment;
}
*xacc = acc;
}
void
vs_scanline_merge_4tap_RGB555 (uint8_t * dest_u8, uint8_t * src1_u8,
uint8_t * src2_u8, uint8_t * src3_u8, uint8_t * src4_u8, int n, int acc)
{
int i;
int y, y_r, y_b, y_g;
int a, b, c, d;
uint16_t *dest = (uint16_t *) dest_u8;
uint16_t *src1 = (uint16_t *) src1_u8;
uint16_t *src2 = (uint16_t *) src2_u8;
uint16_t *src3 = (uint16_t *) src3_u8;
uint16_t *src4 = (uint16_t *) src4_u8;
acc = (acc >> 8) & 0xff;
a = vs_4tap_taps[acc][0];
b = vs_4tap_taps[acc][1];
c = vs_4tap_taps[acc][2];
d = vs_4tap_taps[acc][3];
for (i = 0; i < n; i++) {
y = a * RGB555_R (src1[i]);
y += b * RGB555_R (src2[i]);
y += c * RGB555_R (src3[i]);
y += d * RGB555_R (src4[i]);
y += (1 << (SHIFT - 1));
y_r = CLAMP (y >> SHIFT, 0, 255);
y = a * RGB555_G (src1[i]);
y += b * RGB555_G (src2[i]);
y += c * RGB555_G (src3[i]);
y += d * RGB555_G (src4[i]);
y += (1 << (SHIFT - 1));
y_g = CLAMP (y >> SHIFT, 0, 255);
y = a * RGB555_B (src1[i]);
y += b * RGB555_B (src2[i]);
y += c * RGB555_B (src3[i]);
y += d * RGB555_B (src4[i]);
y += (1 << (SHIFT - 1));
y_b = CLAMP (y >> SHIFT, 0, 255);
dest[i] = RGB555 (y_r, y_b, y_g);
}
}
void
vs_image_scale_4tap_RGB555 (const VSImage * dest, const VSImage * src,
uint8_t * tmpbuf)
{
int yacc;
int y_increment;
int x_increment;
int i;
int j;
int xacc;
int k;
if (dest->height == 1)
y_increment = 0;
else
y_increment = ((src->height - 1) << 16) / (dest->height - 1);
if (dest->width == 1)
x_increment = 0;
else
x_increment = ((src->width - 1) << 16) / (dest->width - 1);
k = 0;
for (i = 0; i < 4; i++) {
xacc = 0;
vs_scanline_resample_4tap_RGB555 (tmpbuf + i * dest->stride,
src->pixels + i * src->stride, dest->width, src->width,
&xacc, x_increment);
}
yacc = 0;
for (i = 0; i < dest->height; i++) {
uint8_t *t0, *t1, *t2, *t3;
j = yacc >> 16;
while (j > k) {
k++;
if (k + 3 < src->height) {
xacc = 0;
vs_scanline_resample_4tap_RGB555 (tmpbuf + ((k + 3) & 3) * dest->stride,
src->pixels + (k + 3) * src->stride,
dest->width, src->width, &xacc, x_increment);
}
}
t0 = tmpbuf + (CLAMP (j - 1, 0, src->height - 1) & 3) * dest->stride;
t1 = tmpbuf + (CLAMP (j, 0, src->height - 1) & 3) * dest->stride;
t2 = tmpbuf + (CLAMP (j + 1, 0, src->height - 1) & 3) * dest->stride;
t3 = tmpbuf + (CLAMP (j + 2, 0, src->height - 1) & 3) * dest->stride;
vs_scanline_merge_4tap_RGB555 (dest->pixels + i * dest->stride,
t0, t1, t2, t3, dest->width, yacc & 0xffff);
yacc += y_increment;
}
}

View file

@ -68,6 +68,19 @@ void vs_scanline_merge_4tap_UYVY (uint8_t *dest, uint8_t *src1, uint8_t *src2,
void vs_image_scale_4tap_UYVY (const VSImage * dest, const VSImage * src, void vs_image_scale_4tap_UYVY (const VSImage * dest, const VSImage * src,
uint8_t * tmpbuf); uint8_t * tmpbuf);
void vs_scanline_resample_4tap_RGB565 (uint8_t *dest, uint8_t *src,
int n, int src_width, int *xacc, int increment);
void vs_scanline_merge_4tap_RGB565 (uint8_t *dest, uint8_t *src1, uint8_t *src2,
uint8_t *src3, uint8_t *src4, int n, int acc);
void vs_image_scale_4tap_RGB565 (const VSImage * dest, const VSImage * src,
uint8_t * tmpbuf);
void vs_scanline_resample_4tap_RGB555 (uint8_t *dest, uint8_t *src,
int n, int src_width, int *xacc, int increment);
void vs_scanline_merge_4tap_RGB555 (uint8_t *dest, uint8_t *src1, uint8_t *src2,
uint8_t *src3, uint8_t *src4, int n, int acc);
void vs_image_scale_4tap_RGB555 (const VSImage * dest, const VSImage * src,
uint8_t * tmpbuf);
#endif #endif