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Faster video rendering for e200 and Gigabeat.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14675 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2007-09-12 09:02:31 +00:00
parent 79244b2a3b
commit e6511d8eaa
4 changed files with 234 additions and 290 deletions
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256
firmware/target/arm/s3c2440/gigabeat-fx/lcd-as-meg-fx.S
View file

@ -103,8 +103,7 @@ lcd_copy_buffer_rect: @
/****************************************************************************
* void lcd_write_yuv_420_lines(fb_data *dst,
* unsigned char chroma_buf[LCD_HEIGHT/2*3],
unsigned char const * const src[3],
* unsigned char const * const src[3],
* int width,
* int stride);
*
@ -115,189 +114,166 @@ lcd_copy_buffer_rect: @
* |R| |74 0 101| |Y' - 16| >> 9
* |G| = |74 -24 -51| |Cb - 128| >> 8
* |B| |74 128 0| |Cr - 128| >> 9
*
* Write four RGB565 pixels in the following order on each loop:
* 1 3 + > down
* 2 4 \/ left
*/
.section .icode, "ax", %progbits
.align 2
.global lcd_write_yuv420_lines
.type lcd_write_yuv420_lines, %function
lcd_write_yuv420_lines:
@ r0 = dst
@ r1 = chroma_buf
@ r2 = yuv_src
@ r3 = width
@ [sp] = stride
stmfd sp!, { r4-r12, lr } @ save non-scratch
stmfd sp!, { r0, r3 } @ save dst and width
mov r14, #74 @ r14 = Y factor
ldmia r2, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p
@ r0 = dst
@ r1 = yuv_src
@ r2 = width
@ r3 = stride
stmfd sp!, { r4-r12 } @ save non-scratch
ldmia r1, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p
@ r5 = yuv_src[1] = Cb_p
@ r6 = yuv_src[2] = Cr_p
10: @ loop line 1 @
ldrb r2, [r4], #1 @ r2 = *Y'_p++;
ldrb r8, [r5], #1 @ r8 = *Cb_p++;
ldrb r11, [r6], #1 @ r11 = *Cr_p++;
@ r1 = scratch
10: @ loop line @
ldrb r7, [r4] @ r7 = *Y'_p;
ldrb r8, [r5], #1 @ r8 = *Cb_p++;
ldrb r9, [r6], #1 @ r9 = *Cr_p++;
@
@ compute Y
sub r2, r2, #16 @ r7 = Y = (Y' - 16)*74
mul r7, r2, r14 @
sub r7, r7, #16 @ r7 = Y = (Y' - 16)*74
add r12, r7, r7, asl #2 @ actually (Y' - 16)*37 and shift right
add r7, r12, r7, asl #5 @ by one less when adding - same for all
@
sub r8, r8, #128 @ Cb -= 128
sub r11, r11, #128 @ Cr -= 128
sub r9, r9, #128 @ Cr -= 128
@
mvn r2, #23 @ compute guv
mul r10, r2, r8 @ r10 = Cb*-24
mvn r2, #50 @
mla r10, r2, r11, r10 @ r10 = r10 + Cr*-51
add r10, r9, r9, asl #1 @ r10 = Cr*51 + Cb*24
add r10, r10, r10, asl #4 @
add r10, r10, r8, asl #3 @
add r10, r10, r8, asl #4 @
@
mov r2, #101 @ compute rv
mul r9, r11, r2 @ r9 = rv = Cr*101
add r11, r9, r9, asl #2 @ r9 = Cr*101
add r11, r11, r9, asl #5 @
add r9, r11, r9, asl #6 @
@
@ store chromas in line buffer
add r8, r8, #2 @ bu = (Cb + 2) >> 2
mov r8, r8, asr #2 @
strb r8, [r1], #1 @
add r9, r9, #256 @ rv = (Cr + 256) >> 9
add r8, r8, #2 @ r8 = bu = (Cb*128 + 128) >> 8
mov r8, r8, asr #2 @
add r9, r9, #256 @ r9 = rv = (r9 + 256) >> 9
mov r9, r9, asr #9 @
strb r9, [r1], #1 @
mov r10, r10, asr #8 @ guv >>= 8
strb r10, [r1], #1 @
rsb r10, r10, #128 @ r10 = guv = (-r10 + 128) >> 8
mov r10, r10, asr #8 @
@ compute R, G, and B
add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
add r1, r8, r7, asr #8 @ r1 = b = (Y >> 9) + bu
add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
@
orr r12, r2, r11 @ check if clamping is needed...
orr r12, r1, r11 @ check if clamping is needed...
orr r12, r12, r7, asr #1 @ ...at all
cmp r12, #31 @
bls 15f @ no clamp @
mov r12, #31 @
cmp r12, r2 @ clamp b
andlo r2, r12, r2, asr #31 @
eorlo r2, r2, r12 @
cmp r12, r11 @ clamp r
andlo r11, r12, r11, asr #31 @
eorlo r11, r11, r12 @
cmp r12, r7, asr #1 @ clamp g
andlo r7, r12, r7, asr #31 @
eorlo r7, r7, r12 @
orrlo r7, r7, r7, asl #1 @
cmp r1, #31 @ clamp b
mvnhi r1, r1, asr #31 @
andhi r1, r1, #31 @
cmp r11, #31 @ clamp r
mvnhi r11, r11, asr #31 @
andhi r11, r11, #31 @
cmp r7, #63 @ clamp g
mvnhi r7, r7, asr #31 @
andhi r7, r7, #63 @
15: @ no clamp @
@
orr r12, r2, r7, lsl #5 @ r4 |= (g << 5)
ldrb r2, [r4], #1 @ r2 = Y' = *Y'_p++
orr r12, r1, r7, lsl #5 @ r4 |= (g << 5)
ldrb r7, [r4, r3] @ r7 = Y' = *(Y'_p + stride)
orr r12, r12, r11, lsl #11 @ r4 = b | (r << 11)
strh r12, [r0], #LCD_WIDTH @ store pixel
strh r12, [r0] @ store pixel
@
sub r2, r2, #16 @ r7 = Y = (Y' - 16)*74
mul r7, r2, r14 @ next Y
sub r7, r7, #16 @ r7 = Y = (Y' - 16)*74
add r12, r7, r7, asl #2 @
add r7, r12, r7, asl #5 @
@ compute R, G, and B
add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
add r1, r8, r7, asr #8 @ r1 = b = (Y >> 9) + bu
add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
@
orr r12, r2, r11 @ check if clamping is needed...
orr r12, r1, r11 @ check if clamping is needed...
orr r12, r12, r7, asr #1 @ ...at all
cmp r12, #31 @
bls 15f @ no clamp @
mov r12, #31 @
cmp r12, r2 @ clamp b
andlo r2, r12, r2, asr #31 @
eorlo r2, r2, r12 @
cmp r12, r11 @ clamp r
andlo r11, r12, r11, asr #31 @
eorlo r11, r11, r12 @
cmp r12, r7, asr #1 @ clamp g
andlo r7, r12, r7, asr #31 @
eorlo r7, r7, r12 @
orrlo r7, r7, r7, asl #1 @
cmp r1, #31 @ clamp b
mvnhi r1, r1, asr #31 @
andhi r1, r1, #31 @
cmp r11, #31 @ clamp r
mvnhi r11, r11, asr #31 @
andhi r11, r11, #31 @
cmp r7, #63 @ clamp g
mvnhi r7, r7, asr #31 @
andhi r7, r7, #63 @
15: @ no clamp @
@
orr r12, r2, r11, lsl #11 @ r4 = b | (r << 11)
orr r12, r12, r7, lsl #5 @ r4 |= (g << 5)
strh r12, [r0, #LCD_WIDTH]! @ store pixel
orr r12, r1, r11, lsl #11 @ r12 = b | (r << 11)
orr r12, r12, r7, lsl #5 @ r12 |= (g << 5)
ldrb r7, [r4, #1]! @ r7 = Y' = *(++Y'_p)
strh r12, [r0, #-2] @ store pixel
add r0, r0, #2*LCD_WIDTH @
@
subs r3, r3, #2 @
bgt 10b @ loop line 1 @
@ do second line
@
ldmfd sp!, { r0, r3 } @ pop dst and width
sub r0, r0, #2 @ set dst to start of next line
sub r1, r1, r3, asl #1 @ rewind chroma pointer...
ldr r2, [sp, #40] @ r2 = stride
add r1, r1, r3, asr #1 @ ... (r1 -= width/2*3)
@ move sources to start of next line
sub r2, r2, r3 @ r2 = skip = stride - width
add r4, r4, r2 @ r4 = Y'_p + skip
@
20: @ loop line 2 @
ldrb r2, [r4], #1 @ r7 = Y' = *Y'_p++
ldrsb r8, [r1], #1 @ reload saved chromas
ldrsb r9, [r1], #1 @
ldrsb r10, [r1], #1 @
@
sub r2, r2, #16 @ r2 = Y = (Y' - 16)*74
mul r7, r2, r14 @
sub r7, r7, #16 @ r7 = Y = (Y' - 16)*74
add r12, r7, r7, asl #2 @
add r7, r12, r7, asl #5 @
@ compute R, G, and B
add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
add r1, r8, r7, asr #8 @ r1 = b = (Y >> 9) + bu
add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
@
orr r12, r2, r11 @ check if clamping is needed...
orr r12, r1, r11 @ check if clamping is needed...
orr r12, r12, r7, asr #1 @ ...at all
cmp r12, #31 @
bls 25f @ no clamp @
mov r12, #31 @
cmp r12, r2 @ clamp b
andlo r2, r12, r2, asr #31 @
eorlo r2, r2, r12 @
cmp r12, r11 @ clamp r
andlo r11, r12, r11, asr #31 @
eorlo r11, r11, r12 @
cmp r12, r7, asr #1 @ clamp g
andlo r7, r12, r7, asr #31 @
eorlo r7, r7, r12 @
orrlo r7, r7, r7, asl #1 @
25: @ no clamp @
bls 15f @ no clamp @
cmp r1, #31 @ clamp b
mvnhi r1, r1, asr #31 @
andhi r1, r1, #31 @
cmp r11, #31 @ clamp r
mvnhi r11, r11, asr #31 @
andhi r11, r11, #31 @
cmp r7, #63 @ clamp g
mvnhi r7, r7, asr #31 @
andhi r7, r7, #63 @
15: @ no clamp @
@
orr r12, r2, r11, lsl #11 @ r4 = b | (r << 11)
ldrb r2, [r4], #1 @ r2 = Y' = *Y'_p++
orr r12, r12, r7, lsl #5 @ r4 |= (g << 5)
strh r12, [r0], #LCD_WIDTH @ store pixel
orr r12, r1, r7, lsl #5 @ r12 = b | (g << 5)
ldrb r7, [r4, r3] @ r7 = Y' = *(Y'_p + stride)
orr r12, r12, r11, lsl #11 @ r12 |= (r << 11)
strh r12, [r0] @ store pixel
@
@ do second pixel
@
sub r2, r2, #16 @ r2 = Y = (Y' - 16)*74
mul r7, r2, r14 @
sub r7, r7, #16 @ r7 = Y = (Y' - 16)*74
add r12, r7, r7, asl #2 @
add r7, r12, r7, asl #5 @
@ compute R, G, and B
add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
add r1, r8, r7, asr #8 @ r1 = b = (Y >> 9) + bu
add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
@
orr r12, r2, r11 @ check if clamping is needed...
orr r12, r1, r11 @ check if clamping is needed...
orr r12, r12, r7, asr #1 @ ...at all
cmp r12, #31 @
bls 25f @ no clamp @
mov r12, #31 @
cmp r12, r2 @ clamp b
andlo r2, r12, r2, asr #31 @
eorlo r2, r2, r12 @
cmp r12, r11 @ clamp r
andlo r11, r12, r11, asr #31 @
eorlo r11, r11, r12 @
cmp r12, r7, asr #1 @ clamp g
andlo r7, r12, r7, asr #31 @
eorlo r7, r7, r12 @
orrlo r7, r7, r7, asl #1 @
25: @ no clamp @
bls 15f @ no clamp @
cmp r1, #31 @ clamp b
mvnhi r1, r1, asr #31 @
andhi r1, r1, #31 @
cmp r11, #31 @ clamp r
mvnhi r11, r11, asr #31 @
andhi r11, r11, #31 @
cmp r7, #63 @ clamp g
mvnhi r7, r7, asr #31 @
andhi r7, r7, #63 @
15: @ no clamp @
@
orr r12, r2, r11, lsl #11 @ r4 = b | (r << 11)
orr r12, r12, r7, lsl #5 @ r4 |= (g << 5)
strh r12, [r0, #LCD_WIDTH]! @ store pixel
orr r12, r1, r11, lsl #11 @ r12 = b | (r << 11)
orr r12, r12, r7, lsl #5 @ r12 |= (g << 5)
strh r12, [r0, #-2] @ store pixel
add r0, r0, #2*LCD_WIDTH @
add r4, r4, #1 @
@
subs r3, r3, #2 @
bgt 20b @ loop line 2 @
subs r2, r2, #2 @ subtract block from width
bgt 10b @ loop line @
@
ldmfd sp!, { r4-r12, pc } @ restore registers and return
ldmfd sp!, { r4-r12 } @ restore registers and return
bx lr @
.size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines

5
firmware/target/arm/s3c2440/gigabeat-fx/lcd-meg-fx.c
View file

@ -250,7 +250,6 @@ void lcd_bitmap_transparent_part(const fb_data *src, int src_x, int src_y,
/* Line write helper function for lcd_yuv_blit. Write two lines of yuv420. */
extern void lcd_write_yuv420_lines(fb_data *dst,
unsigned char chroma_buf[LCD_HEIGHT/2*3],
unsigned char const * const src[3],
int width,
int stride);
@ -263,7 +262,6 @@ void lcd_yuv_blit(unsigned char * const src[3],
{
/* Caches for chroma data so it only need be recaculated every other
line */
unsigned char chroma_buf[LCD_HEIGHT/2*3]; /* 480 bytes */
unsigned char const * yuv_src[3];
off_t z;
@ -283,8 +281,7 @@ void lcd_yuv_blit(unsigned char * const src[3],
do
{
lcd_write_yuv420_lines(dst, chroma_buf, yuv_src, width,
stride);
lcd_write_yuv420_lines(dst, yuv_src, width, stride);
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;

256
firmware/target/arm/sandisk/sansa-e200/lcd-as-e200.S
View file

@ -103,8 +103,7 @@ lcd_copy_buffer_rect: @
/****************************************************************************
* void lcd_write_yuv_420_lines(fb_data *dst,
* unsigned char chroma_buf[LCD_HEIGHT/2*3],
unsigned char const * const src[3],
* unsigned char const * const src[3],
* int width,
* int stride);
*
@ -115,189 +114,166 @@ lcd_copy_buffer_rect: @
* |R| |74 0 101| |Y' - 16| >> 9
* |G| = |74 -24 -51| |Cb - 128| >> 8
* |B| |74 128 0| |Cr - 128| >> 9
*
* Write four RGB565 pixels in the following order on each loop:
* 1 3 + > down
* 2 4 \/ left
*/
.section .icode, "ax", %progbits
.align 2
.global lcd_write_yuv420_lines
.type lcd_write_yuv420_lines, %function
lcd_write_yuv420_lines:
@ r0 = dst
@ r1 = chroma_buf
@ r2 = yuv_src
@ r3 = width
@ [sp] = stride
stmfd sp!, { r4-r12, lr } @ save non-scratch
stmfd sp!, { r0, r3 } @ save dst and width
mov r14, #74 @ r14 = Y factor
ldmia r2, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p
@ r0 = dst
@ r1 = yuv_src
@ r2 = width
@ r3 = stride
stmfd sp!, { r4-r12 } @ save non-scratch
ldmia r1, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p
@ r5 = yuv_src[1] = Cb_p
@ r6 = yuv_src[2] = Cr_p
10: @ loop line 1 @
ldrb r2, [r4], #1 @ r2 = *Y'_p++;
ldrb r8, [r5], #1 @ r8 = *Cb_p++;
ldrb r11, [r6], #1 @ r11 = *Cr_p++;
@ r1 = scratch
10: @ loop line @
ldrb r7, [r4] @ r7 = *Y'_p;
ldrb r8, [r5], #1 @ r8 = *Cb_p++;
ldrb r9, [r6], #1 @ r9 = *Cr_p++;
@
@ compute Y
sub r2, r2, #16 @ r7 = Y = (Y' - 16)*74
mul r7, r2, r14 @
sub r7, r7, #16 @ r7 = Y = (Y' - 16)*74
add r12, r7, r7, asl #2 @ actually (Y' - 16)*37 and shift right
add r7, r12, r7, asl #5 @ by one less when adding - same for all
@
sub r8, r8, #128 @ Cb -= 128
sub r11, r11, #128 @ Cr -= 128
sub r9, r9, #128 @ Cr -= 128
@
mvn r2, #23 @ compute guv
mul r10, r2, r8 @ r10 = Cb*-24
mvn r2, #50 @
mla r10, r2, r11, r10 @ r10 = r10 + Cr*-51
add r10, r9, r9, asl #1 @ r10 = Cr*51 + Cb*24
add r10, r10, r10, asl #4 @
add r10, r10, r8, asl #3 @
add r10, r10, r8, asl #4 @
@
mov r2, #101 @ compute rv
mul r9, r11, r2 @ r9 = rv = Cr*101
add r11, r9, r9, asl #2 @ r9 = Cr*101
add r11, r11, r9, asl #5 @
add r9, r11, r9, asl #6 @
@
@ store chromas in line buffer
add r8, r8, #2 @ bu = (Cb + 2) >> 2
mov r8, r8, asr #2 @
strb r8, [r1], #1 @
add r9, r9, #256 @ rv = (Cr + 256) >> 9
add r8, r8, #2 @ r8 = bu = (Cb*128 + 128) >> 8
mov r8, r8, asr #2 @
add r9, r9, #256 @ r9 = rv = (r9 + 256) >> 9
mov r9, r9, asr #9 @
strb r9, [r1], #1 @
mov r10, r10, asr #8 @ guv >>= 8
strb r10, [r1], #1 @
rsb r10, r10, #128 @ r10 = guv = (-r10 + 128) >> 8
mov r10, r10, asr #8 @
@ compute R, G, and B
add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
add r1, r8, r7, asr #8 @ r1 = b = (Y >> 9) + bu
add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
@
orr r12, r2, r11 @ check if clamping is needed...
orr r12, r1, r11 @ check if clamping is needed...
orr r12, r12, r7, asr #1 @ ...at all
cmp r12, #31 @
bls 15f @ no clamp @
mov r12, #31 @
cmp r12, r2 @ clamp b
andlo r2, r12, r2, asr #31 @
eorlo r2, r2, r12 @
cmp r12, r11 @ clamp r
andlo r11, r12, r11, asr #31 @
eorlo r11, r11, r12 @
cmp r12, r7, asr #1 @ clamp g
andlo r7, r12, r7, asr #31 @
eorlo r7, r7, r12 @
orrlo r7, r7, r7, asl #1 @
cmp r1, #31 @ clamp b
mvnhi r1, r1, asr #31 @
andhi r1, r1, #31 @
cmp r11, #31 @ clamp r
mvnhi r11, r11, asr #31 @
andhi r11, r11, #31 @
cmp r7, #63 @ clamp g
mvnhi r7, r7, asr #31 @
andhi r7, r7, #63 @
15: @ no clamp @
@
orr r12, r2, r7, lsl #5 @ r4 |= (g << 5)
ldrb r2, [r4], #1 @ r2 = Y' = *Y'_p++
orr r12, r1, r7, lsl #5 @ r4 |= (g << 5)
ldrb r7, [r4, r3] @ r7 = Y' = *(Y'_p + stride)
orr r12, r12, r11, lsl #11 @ r4 = b | (r << 11)
strh r12, [r0], #LCD_WIDTH @ store pixel
strh r12, [r0] @ store pixel
@
sub r2, r2, #16 @ r7 = Y = (Y' - 16)*74
mul r7, r2, r14 @ next Y
sub r7, r7, #16 @ r7 = Y = (Y' - 16)*74
add r12, r7, r7, asl #2 @
add r7, r12, r7, asl #5 @
@ compute R, G, and B
add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
add r1, r8, r7, asr #8 @ r1 = b = (Y >> 9) + bu
add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
@
orr r12, r2, r11 @ check if clamping is needed...
orr r12, r1, r11 @ check if clamping is needed...
orr r12, r12, r7, asr #1 @ ...at all
cmp r12, #31 @
bls 15f @ no clamp @
mov r12, #31 @
cmp r12, r2 @ clamp b
andlo r2, r12, r2, asr #31 @
eorlo r2, r2, r12 @
cmp r12, r11 @ clamp r
andlo r11, r12, r11, asr #31 @
eorlo r11, r11, r12 @
cmp r12, r7, asr #1 @ clamp g
andlo r7, r12, r7, asr #31 @
eorlo r7, r7, r12 @
orrlo r7, r7, r7, asl #1 @
cmp r1, #31 @ clamp b
mvnhi r1, r1, asr #31 @
andhi r1, r1, #31 @
cmp r11, #31 @ clamp r
mvnhi r11, r11, asr #31 @
andhi r11, r11, #31 @
cmp r7, #63 @ clamp g
mvnhi r7, r7, asr #31 @
andhi r7, r7, #63 @
15: @ no clamp @
@
orr r12, r2, r11, lsl #11 @ r4 = b | (r << 11)
orr r12, r12, r7, lsl #5 @ r4 |= (g << 5)
strh r12, [r0, #LCD_WIDTH]! @ store pixel
orr r12, r1, r11, lsl #11 @ r12 = b | (r << 11)
orr r12, r12, r7, lsl #5 @ r12 |= (g << 5)
ldrb r7, [r4, #1]! @ r7 = Y' = *(++Y'_p)
strh r12, [r0, #-2] @ store pixel
add r0, r0, #2*LCD_WIDTH @
@
subs r3, r3, #2 @
bgt 10b @ loop line 1 @
@ do second line
@
ldmfd sp!, { r0, r3 } @ pop dst and width
sub r0, r0, #2 @ set dst to start of next line
sub r1, r1, r3, asl #1 @ rewind chroma pointer...
ldr r2, [sp, #40] @ r2 = stride
add r1, r1, r3, asr #1 @ ... (r1 -= width/2*3)
@ move sources to start of next line
sub r2, r2, r3 @ r2 = skip = stride - width
add r4, r4, r2 @ r4 = Y'_p + skip
@
20: @ loop line 2 @
ldrb r2, [r4], #1 @ r7 = Y' = *Y'_p++
ldrsb r8, [r1], #1 @ reload saved chromas
ldrsb r9, [r1], #1 @
ldrsb r10, [r1], #1 @
@
sub r2, r2, #16 @ r2 = Y = (Y' - 16)*74
mul r7, r2, r14 @
sub r7, r7, #16 @ r7 = Y = (Y' - 16)*74
add r12, r7, r7, asl #2 @
add r7, r12, r7, asl #5 @
@ compute R, G, and B
add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
add r1, r8, r7, asr #8 @ r1 = b = (Y >> 9) + bu
add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
@
orr r12, r2, r11 @ check if clamping is needed...
orr r12, r1, r11 @ check if clamping is needed...
orr r12, r12, r7, asr #1 @ ...at all
cmp r12, #31 @
bls 25f @ no clamp @
mov r12, #31 @
cmp r12, r2 @ clamp b
andlo r2, r12, r2, asr #31 @
eorlo r2, r2, r12 @
cmp r12, r11 @ clamp r
andlo r11, r12, r11, asr #31 @
eorlo r11, r11, r12 @
cmp r12, r7, asr #1 @ clamp g
andlo r7, r12, r7, asr #31 @
eorlo r7, r7, r12 @
orrlo r7, r7, r7, asl #1 @
25: @ no clamp @
bls 15f @ no clamp @
cmp r1, #31 @ clamp b
mvnhi r1, r1, asr #31 @
andhi r1, r1, #31 @
cmp r11, #31 @ clamp r
mvnhi r11, r11, asr #31 @
andhi r11, r11, #31 @
cmp r7, #63 @ clamp g
mvnhi r7, r7, asr #31 @
andhi r7, r7, #63 @
15: @ no clamp @
@
orr r12, r2, r11, lsl #11 @ r4 = b | (r << 11)
ldrb r2, [r4], #1 @ r2 = Y' = *Y'_p++
orr r12, r12, r7, lsl #5 @ r4 |= (g << 5)
strh r12, [r0], #LCD_WIDTH @ store pixel
orr r12, r1, r7, lsl #5 @ r12 = b | (g << 5)
ldrb r7, [r4, r3] @ r7 = Y' = *(Y'_p + stride)
orr r12, r12, r11, lsl #11 @ r12 |= (r << 11)
strh r12, [r0] @ store pixel
@
@ do second pixel
@
sub r2, r2, #16 @ r2 = Y = (Y' - 16)*74
mul r7, r2, r14 @
sub r7, r7, #16 @ r7 = Y = (Y' - 16)*74
add r12, r7, r7, asl #2 @
add r7, r12, r7, asl #5 @
@ compute R, G, and B
add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
add r1, r8, r7, asr #8 @ r1 = b = (Y >> 9) + bu
add r11, r9, r7, asr #8 @ r11 = r = (Y >> 9) + rv
add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
@
orr r12, r2, r11 @ check if clamping is needed...
orr r12, r1, r11 @ check if clamping is needed...
orr r12, r12, r7, asr #1 @ ...at all
cmp r12, #31 @
bls 25f @ no clamp @
mov r12, #31 @
cmp r12, r2 @ clamp b
andlo r2, r12, r2, asr #31 @
eorlo r2, r2, r12 @
cmp r12, r11 @ clamp r
andlo r11, r12, r11, asr #31 @
eorlo r11, r11, r12 @
cmp r12, r7, asr #1 @ clamp g
andlo r7, r12, r7, asr #31 @
eorlo r7, r7, r12 @
orrlo r7, r7, r7, asl #1 @
25: @ no clamp @
bls 15f @ no clamp @
cmp r1, #31 @ clamp b
mvnhi r1, r1, asr #31 @
andhi r1, r1, #31 @
cmp r11, #31 @ clamp r
mvnhi r11, r11, asr #31 @
andhi r11, r11, #31 @
cmp r7, #63 @ clamp g
mvnhi r7, r7, asr #31 @
andhi r7, r7, #63 @
15: @ no clamp @
@
orr r12, r2, r11, lsl #11 @ r4 = b | (r << 11)
orr r12, r12, r7, lsl #5 @ r4 |= (g << 5)
strh r12, [r0, #LCD_WIDTH]! @ store pixel
orr r12, r1, r11, lsl #11 @ r12 = b | (r << 11)
orr r12, r12, r7, lsl #5 @ r12 |= (g << 5)
strh r12, [r0, #-2] @ store pixel
add r0, r0, #2*LCD_WIDTH @
add r4, r4, #1 @
@
subs r3, r3, #2 @
bgt 20b @ loop line 2 @
subs r2, r2, #2 @ subtract block from width
bgt 10b @ loop line @
@
ldmfd sp!, { r4-r12, pc } @ restore registers and return
ldmfd sp!, { r4-r12 } @ restore registers and return
bx lr @
.size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines

7
firmware/target/arm/sandisk/sansa-e200/lcd-e200.c
View file

@ -627,7 +627,6 @@ void lcd_blit(const fb_data* data, int x, int by, int width,
/* Line write helper function for lcd_yuv_blit. Write two lines of yuv420. */
extern void lcd_write_yuv420_lines(fb_data *dst,
unsigned char chroma_buf[LCD_HEIGHT/2*3],
unsigned char const * const src[3],
int width,
int stride);
@ -638,9 +637,6 @@ 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)
{
/* Caches for chroma data so it only need be recaculated every other
line */
static unsigned char chroma_buf[LCD_HEIGHT/2*3]; /* 330 bytes */
unsigned char const * yuv_src[3];
off_t z;
@ -661,8 +657,7 @@ void lcd_yuv_blit(unsigned char * const src[3],
do
{
lcd_write_yuv420_lines(dst, chroma_buf, yuv_src, width,
stride);
lcd_write_yuv420_lines(dst, yuv_src, width, stride);
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;