diff options
Diffstat (limited to 'firmware/target/arm/ipod')
| -rw-r--r-- | firmware/target/arm/ipod/video/lcd-as-video.S | 226 | ||||
| -rw-r--r-- | firmware/target/arm/ipod/video/lcd-video.c | 127 |
2 files changed, 248 insertions, 105 deletions
diff --git a/firmware/target/arm/ipod/video/lcd-as-video.S b/firmware/target/arm/ipod/video/lcd-as-video.S new file mode 100644 index 0000000000..938df3e86a --- /dev/null +++ b/firmware/target/arm/ipod/video/lcd-as-video.S @@ -0,0 +1,226 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2007 by Andree Buschmann + * + * All files in this archive are subject to the GNU General Public License. + * See the file COPYING in the source tree root for full license agreement. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +/**************************************************************************** + * void lcd_write_yuv_420_lines(unsigned char const * const src[3], + * int width, + * int stride); + * + * |R| |1.000000 -0.000001 1.402000| |Y'| + * |G| = |1.000000 -0.334136 -0.714136| |Pb| + * |B| |1.000000 1.772000 0.000000| |Pr| + * Scaled, normalized, rounded and tweaked to yield RGB 565: + * |R| |74 0 101| |Y' - 16| >> 9 + * |G| = |74 -24 -51| |Cb - 128| >> 8 + * |B| |74 128 0| |Cr - 128| >> 9 + */ + .section .icode, "ax", %progbits + .align 2 + .global lcd_write_yuv420_lines + .type lcd_write_yuv420_lines, %function +lcd_write_yuv420_lines: + /* r0 = yuv_src */ + /* r1 = width */ + /* r2 = stride */ + stmfd sp!, { r4-r12 } /* save non-scratch */ + ldmia r0, { r10, r11, r12 } /* r10 = yuv_src[0] = Y'_p */ + /* r11 = yuv_src[1] = Cb_p */ + /* r12 = yuv_src[2] = Cr_p */ + add r2, r10, r2 /* r2 = &ysrc[stride] */ + add r3, r1, r1, asl #1 /* number of bytes for chroma buffer */ + add r3, r3, #15 /* plus room for 3 additional words, */ + bic r3, r3, #3 /* rounded up to multiples of 4 byte */ + sub sp, sp, r3 /* and allocate on stack */ + stmia sp, {r1, r2, r3} /* width, &ysrc[stride], stack_alloc */ + + mov r7, r1 /* r7 = loop count */ + add r8, sp, #12 /* chroma buffer */ + mov r9, #0x30000000 /* LCD data port */ + + /* 1st loop start */ +10: /* loop start */ + + ldrb r0, [r11], #1 /* r0 = *usrc++ = *Cb_p++ */ + ldrb r1, [r12], #1 /* r1 = *vsrc++ = *Cr_p++ */ + + sub r0, r0, #128 /* r0 = Cb-128 */ + sub r1, r1, #128 /* r1 = Cr-128 */ + + add r3, r1, r1, asl #1 /* r3 = Cr*51 + Cb*24 */ + add r3, r3, r3, asl #4 + add r3, r3, r0, asl #3 + add r3, r3, r0, asl #4 + + add r4, r1, r1, asl #2 /* r1 = Cr*101 */ + add r4, r4, r1, asl #5 + add r1, r4, r1, asl #6 + + add r1, r1, #256 /* r1 = rv = (r1 + 256) >> 9 */ + mov r1, r1, asr #9 + strb r1, [r8], #1 /* store r1 to chroma_buf */ + rsb r3, r3, #128 /* r3 = guv = (-r3 + 128) >> 8 */ + mov r3, r3, asr #8 + strb r3, [r8], #1 /* store r3 to chroma_buf */ + add r0, r0, #2 /* r0 = bu = (Cb*128 + 256) >> 9 */ + mov r0, r0, asr #2 + strb r0, [r8], #1 /* store r0 to chroma_buf */ + + /* 1st loop, first pixel */ + ldrb r5, [r10], #1 /* r5 = *ysrc++ = *Y'_p++ */ + sub r5, r5, #16 /* r5 = (Y'-16) * 74 */ + add r2, r5, r5, asl #2 + add r5, r2, r5, asl #5 + + add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */ + add r2, r3, r5, asr #7 /* r2 = g = (Y >> 8) + guv */ + add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */ + + orr r5, r6, r4 /* check if clamping is needed... */ + orr r5, r5, r2, asr #1 /* ...at all */ + cmp r5, #31 + bls 15f /* -> no clamp */ + cmp r6, #31 /* clamp r */ + mvnhi r6, r6, asr #31 + andhi r6, r6, #31 + cmp r2, #63 /* clamp g */ + mvnhi r2, r2, asr #31 + andhi r2, r2, #63 + cmp r4, #31 /* clamp b */ + mvnhi r4, r4, asr #31 + andhi r4, r4, #31 +15: /* no clamp */ + + orr r4, r4, r2, lsl #5 /* pixel = r<<11 | g<<5 | b */ + orr r4, r4, r6, lsl #11 + strh r4, [r9] /* write pixel */ + + /* 1st loop, second pixel */ + ldrb r5, [r10], #1 /* r5 = *ysrc++ = *Y'_p++ */ + sub r5, r5, #16 /* r5 = (Y'-16) * 74 */ + add r2, r5, r5, asl #2 + add r5, r2, r5, asl #5 + + add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */ + add r2, r3, r5, asr #7 /* r2 = g = (Y >> 8) + guv */ + add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */ + + orr r5, r6, r4 /* check if clamping is needed... */ + orr r5, r5, r2, asr #1 /* ...at all */ + cmp r5, #31 + bls 15f /* -> no clamp */ + cmp r6, #31 /* clamp r */ + mvnhi r6, r6, asr #31 + andhi r6, r6, #31 + cmp r2, #63 /* clamp g */ + mvnhi r2, r2, asr #31 + andhi r2, r2, #63 + cmp r4, #31 /* clamp b */ + mvnhi r4, r4, asr #31 + andhi r4, r4, #31 +15: /* no clamp */ + + orr r4, r4, r2, lsl #5 /* pixel = r<<11 | g<<5 | b */ + orr r4, r4, r6, lsl #11 + strh r4, [r9] /* write pixel */ + + subs r7, r7, #2 /* check for loop end */ + bgt 10b /* back to beginning */ + /* 1st loop end */ + + add r8, sp, #12 /* chroma buffer */ + ldmia sp, { r7, r10 } /* r7 = loop count */ + /* r10 = &ysrc[stride] */ + + /* 2nd loop start */ +20: /* loop start */ + + /* restore r1, r3 and r0 from chroma buffer */ + ldrsb r1, [r8], #1 + ldrsb r3, [r8], #1 + ldrsb r0, [r8], #1 + + /* 2nd loop, first pixel */ + ldrb r5, [r10], #1 /* r5 = *ysrc++ = *Y'_p++ */ + sub r5, r5, #16 /* r5 = (Y'-16) * 74 */ + add r2, r5, r5, asl #2 + add r5, r2, r5, asl #5 + + add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */ + add r2, r3, r5, asr #7 /* r2 = g = (Y >> 8) + guv */ + add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */ + + orr r5, r6, r4 /* check if clamping is needed... */ + orr r5, r5, r2, asr #1 /* ...at all */ + cmp r5, #31 + bls 15f /* -> no clamp */ + cmp r6, #31 /* clamp r */ + mvnhi r6, r6, asr #31 + andhi r6, r6, #31 + cmp r2, #63 /* clamp g */ + mvnhi r2, r2, asr #31 + andhi r2, r2, #63 + cmp r4, #31 /* clamp b */ + mvnhi r4, r4, asr #31 + andhi r4, r4, #31 +15: /* no clamp */ + + orr r4, r4, r2, lsl #5 /* pixel = r<<11 | g<<5 | b */ + orr r4, r4, r6, lsl #11 + strh r4, [r9] /* write pixel */ + + /* 2nd loop, second pixel */ + ldrb r5, [r10], #1 /* r5 = *ysrc++ = *Y'_p++ */ + sub r5, r5, #16 /* r5 = (Y'-16) * 74 */ + add r2, r5, r5, asl #2 + add r5, r2, r5, asl #5 + + add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */ + add r2, r3, r5, asr #7 /* r2 = g = (Y >> 8) + guv */ + add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */ + + orr r5, r6, r4 /* check if clamping is needed... */ + orr r5, r5, r2, asr #1 /* ...at all */ + cmp r5, #31 + bls 15f /* -> no clamp */ + cmp r6, #31 /* clamp r */ + mvnhi r6, r6, asr #31 + andhi r6, r6, #31 + cmp r2, #63 /* clamp g */ + mvnhi r2, r2, asr #31 + andhi r2, r2, #63 + cmp r4, #31 /* clamp b */ + mvnhi r4, r4, asr #31 + andhi r4, r4, #31 +15: /* no clamp */ + + orr r4, r4, r2, lsl #5 /* pixel = r<<11 | g<<5 | b */ + orr r4, r4, r6, lsl #11 + strh r4, [r9] /* write pixel */ + + subs r7, r7, #2 /* check for loop end */ + bgt 20b /* back to beginning */ + /* 2nd loop end */ + + ldr r3, [sp, #8] + add sp, sp, r3 /* deallocate buffer */ + ldmfd sp!, { r4-r12 } /* restore registers */ + bx lr + + .ltorg + .size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines diff --git a/firmware/target/arm/ipod/video/lcd-video.c b/firmware/target/arm/ipod/video/lcd-video.c index 7ec453760e..8834b39f3f 100644 --- a/firmware/target/arm/ipod/video/lcd-video.c +++ b/firmware/target/arm/ipod/video/lcd-video.c @@ -207,43 +207,26 @@ void lcd_update(void) lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT); } -/* YUV- > RGB565 conversion - * |R| |1.000000 -0.000001 1.402000| |Y'| - * |G| = |1.000000 -0.334136 -0.714136| |Pb| - * |B| |1.000000 1.772000 0.000000| |Pr| - * Scaled, normalized, rounded and tweaked to yield RGB 565: - * |R| |74 0 101| |Y' - 16| >> 9 - * |G| = |74 -24 -51| |Cb - 128| >> 8 - * |B| |74 128 0| |Cr - 128| >> 9 -*/ - -#define RGBYFAC 74 /* 1.0 */ -#define RVFAC 101 /* 1.402 */ -#define GVFAC (-51) /* -0.714136 */ -#define GUFAC (-24) /* -0.334136 */ -#define BUFAC 128 /* 1.772 */ - -/* ROUNDOFFS contain constant for correct round-offs as well as - constant parts of the conversion matrix (e.g. (Y'-16)*RGBYFAC - -> constant part = -16*RGBYFAC). Through extraction of these - constant parts we save at leat 4 substractions in the conversion - loop */ -#define ROUNDOFFSR (256 - 16*RGBYFAC - 128*RVFAC) -#define ROUNDOFFSG (128 - 16*RGBYFAC - 128*GVFAC - 128*GUFAC) -#define ROUNDOFFSB (256 - 16*RGBYFAC - 128*BUFAC) - -#define MAX_5BIT 0x1f -#define MAX_6BIT 0x3f +/* Line write helper function for lcd_yuv_blit. Write two lines of yuv420. */ +extern void lcd_write_yuv420_lines(unsigned char const * const src[3], + int width, + int stride); /* Performance function to blit a YUV bitmap directly to the LCD */ void lcd_yuv_blit(unsigned char * const src[3], int src_x, int src_y, int stride, - int x, int y, int width, int height) ICODE_ATTR; -void lcd_yuv_blit(unsigned char * const src[3], - int src_x, int src_y, int stride, int x, int y, int width, int height) { - width = (width + 1) & ~1; + unsigned char const * yuv_src[3]; + off_t z; + + /* Sorry, but width and height must be >= 2 or else */ + width &= ~1; + + z = stride * src_y; + yuv_src[0] = src[0] + z + src_x; + yuv_src[1] = src[1] + (z >> 2) + (src_x >> 1); + yuv_src[2] = src[2] + (yuv_src[1] - src[1]); if (finishup_needed) { @@ -279,85 +262,19 @@ void lcd_yuv_blit(unsigned char * const src[3], /* wait for it to be write ready */ while ((inw(0x30030000) & 0x2) == 0); - const int ymax = y + height - 1; - const int stride_div_sub_x = stride >> 1; - unsigned char *ysrc = 0; - unsigned char *usrc = 0; - unsigned char *vsrc = 0; - unsigned char *row_end = 0; - int uvoffset; - int yp, up, vp, rc, gc, bc; /* temporary variables */ - int red1, green1, blue1; /* contain RGB of 1st pixel */ - int red2, green2, blue2; /* contain RGB of 2nd pixel */ - - for (; y <= ymax ; y++) + height >>= 1; + do { - /* upsampling, YUV->RGB conversion and reduction to RGB565 in one go */ - uvoffset = stride_div_sub_x*(src_y >> 1) + (src_x >> 1); - ysrc = src[0] + stride * src_y + src_x; - usrc = src[1] + uvoffset; - vsrc = src[2] + uvoffset; - - row_end = ysrc + width; - - do - { - up = *usrc++; - vp = *vsrc++; - rc = RVFAC * vp + ROUNDOFFSR; - gc = GVFAC * vp + GUFAC * up + ROUNDOFFSG; - bc = BUFAC * up + ROUNDOFFSB; - - /* Pixel 1 -> RGB565 */ - yp = *ysrc++ * RGBYFAC; - red1 = (yp + rc) >> 9; - green1 = (yp + gc) >> 8; - blue1 = (yp + bc) >> 9; - - /* Pixel 2 -> RGB565 */ - yp = *ysrc++ * RGBYFAC; - red2 = (yp + rc) >> 9; - green2 = (yp + gc) >> 8; - blue2 = (yp + bc) >> 9; - - /* Since out of bounds errors are relatively rare, we check two - pixels at once to see if any components are out of bounds, and - then fix whichever is broken. This works due to high values and - negative values both being !=0 when bitmasking them. - We first check for red and blue components (5bit range). */ - if ((red1 | blue1 | red2 | blue2) & ~MAX_5BIT) - { - if (red1 & ~MAX_5BIT) - red1 = (red1 >> 31) ? 0 : MAX_5BIT; - if (blue1 & ~MAX_5BIT) - blue1 = (blue1 >> 31) ? 0 : MAX_5BIT; - if (red2 & ~MAX_5BIT) - red2 = (red2 >> 31) ? 0 : MAX_5BIT; - if (blue2 & ~MAX_5BIT) - blue2 = (blue2 >> 31) ? 0 : MAX_5BIT; - } - /* We second check for green component (6bit range) */ - if ((green1 | green2) & ~MAX_6BIT) - { - if (green1 & ~MAX_6BIT) - green1 = (green1 >> 31) ? 0 : MAX_6BIT; - if (green2 & ~MAX_6BIT) - green2 = (green2 >> 31) ? 0 : MAX_6BIT; - } - - /* pixel1 */ - outw((red1 << 11) | (green1 << 5) | blue1, 0x30000000); + lcd_write_yuv420_lines(yuv_src, width, stride); - /* pixel2 */ - outw((red2 << 11) | (green2 << 5) | blue2, 0x30000000); - } - while (ysrc < row_end); - - src_y++; + yuv_src[0] += stride << 1; /* Skip down two luma lines */ + yuv_src[1] += stride >> 1; /* Skip down one chroma line */ + yuv_src[2] += stride >> 1; } + while (--height > 0); /* Top-half of original lcd_bcm_finishup() function */ - outw(0x31, 0x30030000); + outw(0x31, 0x30030000); lcd_bcm_read32(0x1FC); |