forked from len0rd/rockbox
Implemented scrolling up/down by n pixels (<= 7)
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4628 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold
parent
bde77c047d
commit
507800a386
1 changed files with 159 additions and 83 deletions
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@ -314,10 +314,9 @@ void grayblock(int x, int by, unsigned char* src, int stride)
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"mov %2,r5 \n"
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"sub r1,r5 \n" /* r5 = depth - r1 */
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"mov.l .lshrsi3,r1 \n"
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"jsr @r1 \n" /* shift r4 right by r5 */
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"mov r0,r1 \n" /* last result stored in r1 */
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"mov.l .lshrsi3,r0 \n"
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"jsr @r0 \n" /* shift r4 right by r5 */
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"nop \n"
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"or r1,r0 \n" /* rotated_pattern = r0 | r1 */
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"mov.l r0,@-r15 \n" /* push pattern */
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@ -640,8 +639,8 @@ void gray_scroll_left(int count, bool black_border);
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void gray_scroll_right(int count, bool black_border);
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void gray_scroll_up8(bool black_border);
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void gray_scroll_down8(bool black_border);
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void gray_scroll_up1(bool black_border);
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void gray_scroll_down1(bool black_border);
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void gray_scroll_up(int count, bool black_border);
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void gray_scroll_down(int count, bool black_border);
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/* pixel functions */
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void gray_drawpixel(int x, int y, int brightness);
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@ -685,7 +684,7 @@ void gray_black_display(void)
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rb->memset(graybuf->data, 0xFF, MULU16(graybuf->depth, graybuf->plane_size));
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}
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/* Do a lcd_update() to show changes done by rb->lcd_xxx() functions (in areas
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/* Do an lcd_update() to show changes done by rb->lcd_xxx() functions (in areas
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* of the screen not covered by the grayscale overlay). If the grayscale
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* overlay is running, the update will be done in the next call of the
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* interrupt routine, otherwise it will be performed right away. See also
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@ -703,6 +702,9 @@ void gray_deferred_update(void)
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*
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* black_border determines if the pixels scrolled in at the right are black
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* or white
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*
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* Scrolling left/right by an even pixel count is almost twice as fast as
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* scrolling by an odd pixel count.
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*/
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void gray_scroll_left(int count, bool black_border)
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{
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@ -765,6 +767,9 @@ void gray_scroll_left(int count, bool black_border)
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*
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* black_border determines if the pixels scrolled in at the left are black
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* or white
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*
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* Scrolling left/right by an even pixel count is almost twice as fast as
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* scrolling by an odd pixel count.
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*/
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void gray_scroll_right(int count, bool black_border)
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{
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@ -791,7 +796,7 @@ void gray_scroll_right(int count, bool black_border)
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".sr_loop1: \n"
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"mov.b @(%2,%0),r1 \n"
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"mov.b r1,@-%0 \n"
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"cmp/hs %1,%0 \n"
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"cmp/hi %1,%0 \n"
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"bt .sr_loop1 \n"
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: /* outputs */
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: /* inputs */
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@ -806,7 +811,7 @@ void gray_scroll_right(int count, bool black_border)
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".sr_loop2: \n"
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"mov.w @(%2,%0),r1 \n"
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"mov.w r1,@-%0 \n"
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"cmp/hs %1,%0 \n"
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"cmp/hi %1,%0 \n"
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"bt .sr_loop2 \n"
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: /* outputs */
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: /* inputs */
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@ -827,6 +832,8 @@ void gray_scroll_right(int count, bool black_border)
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*
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* black_border determines if the pixels scrolled in at the bottom are black
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* or white
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*
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* Scrolling up/down by 8 pixels is very fast.
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*/
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void gray_scroll_up8(bool black_border)
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{
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@ -865,6 +872,8 @@ void gray_scroll_up8(bool black_border)
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*
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* black_border determines if the pixels scrolled in at the top are black
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* or white
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*
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* Scrolling up/down by 8 pixels is very fast.
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*/
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void gray_scroll_down8(bool black_border)
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{
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@ -899,7 +908,7 @@ void gray_scroll_down8(bool black_border)
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}
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}
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/* Scroll the whole grayscale buffer up by 1 pixel
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/* Scroll the whole grayscale buffer up by <count> pixels (<= 7)
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*
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* black_border determines if the pixels scrolled in at the bottom are black
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* or white
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@ -908,51 +917,84 @@ void gray_scroll_down8(bool black_border)
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* left/right or scrolling up/down byte-wise because it involves bit
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* shifting. That's why it is asm optimized.
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*/
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void gray_scroll_up1(bool black_border)
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void gray_scroll_up(int count, bool black_border)
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{
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int filler;
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unsigned long filler;
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if (graybuf == NULL)
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if (graybuf == NULL || (unsigned) count > 7)
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return;
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if (black_border)
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filler = 1;
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filler = 0xFF;
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else
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filler = 0;
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/* scroll column by column to minimize flicker */
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asm(
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"mov #0,r6 \n" /* x = 0; */
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"mov #0,r6 \n" /* x = 0 */
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"mova .su_shifttbl,r0 \n" /* calculate jump destination for */
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"mov.b @(r0,%6),%6 \n" /* shift amount from table */
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"bra .su_cloop \n" /* skip table */
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"add r0,%6 \n"
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".align 2 \n"
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".su_shifttbl: \n" /* shift jump offset table */
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".byte .su_shift0 - .su_shifttbl \n"
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".byte .su_shift1 - .su_shifttbl \n"
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".byte .su_shift2 - .su_shifttbl \n"
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".byte .su_shift3 - .su_shifttbl \n"
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".byte .su_shift4 - .su_shifttbl \n"
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".byte .su_shift5 - .su_shifttbl \n"
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".byte .su_shift6 - .su_shifttbl \n"
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".byte .su_shift7 - .su_shifttbl \n"
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".su_cloop: \n" /* repeat for every column */
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"mov %1,r7 \n" /* get start address */
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"mov #0,r1 \n" /* current_plane = 0 */
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"mov %1,r2 \n" /* get start address */
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"mov #0,r3 \n" /* current_plane = 0 */
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".su_oloop: \n" /* repeat for every bitplane */
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"mov r7,r2 \n" /* get start address */
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"mov #0,r3 \n" /* current_row = 0 */
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"mov %5,r5 \n" /* get filler bit (bit 0) */
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"mov r2,r4 \n" /* get start address */
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"mov #0,r5 \n" /* current_row = 0 */
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"mov %5,r1 \n" /* get filler bits */
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".su_iloop: \n" /* repeat for all rows */
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"sub %2,r2 \n" /* address -= width; */
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"mov.b @r2,r4 \n" /* get new byte */
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"shll8 r5 \n" /* shift old lsb to bit 8 */
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"extu.b r4,r4 \n" /* extend byte unsigned */
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"or r5,r4 \n" /* merge old lsb */
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"shlr r4 \n" /* shift right */
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"movt r5 \n" /* save new lsb */
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"mov.b r4,@r2 \n" /* store byte */
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"add #1,r3 \n" /* current_row++; */
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"cmp/hi r3,%3 \n" /* cuurent_row < bheight ? */
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"sub %2,r4 \n" /* address -= width */
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"mov.b @r4,r0 \n" /* get data byte */
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"shll8 r1 \n" /* old data to 2nd byte */
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"extu.b r0,r0 \n" /* extend unsigned */
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"or r1,r0 \n" /* combine old data */
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"jmp @%6 \n" /* jump into shift "path" */
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"extu.b r0,r1 \n" /* store data for next round */
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".su_shift6: \n" /* shift right by 0..7 bits */
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"shlr2 r0 \n"
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".su_shift4: \n"
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"shlr2 r0 \n"
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".su_shift2: \n"
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"bra .su_shift0 \n"
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"shlr2 r0 \n"
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".su_shift7: \n"
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"shlr2 r0 \n"
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".su_shift5: \n"
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"shlr2 r0 \n"
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".su_shift3: \n"
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"shlr2 r0 \n"
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".su_shift1: \n"
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"shlr r0 \n"
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".su_shift0: \n"
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"mov.b r0,@r4 \n" /* store data */
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"add #1,r5 \n" /* current_row++ */
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"cmp/hi r5,%3 \n" /* current_row < bheight ? */
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"bt .su_iloop \n"
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"add %4,r7 \n" /* start_address += plane_size; */
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"add #1,r1 \n" /* current_plane++; */
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"cmp/hi r1,%0 \n" /* current_plane < depth ? */
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"add %4,r2 \n" /* start_address += plane_size */
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"add #1,r3 \n" /* current_plane++ */
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"cmp/hi r3,%0 \n" /* current_plane < depth ? */
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"bt .su_oloop \n"
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"add #1,%1 \n" /* start_address++; */
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"add #1,r6 \n" /* x++; */
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"add #1,%1 \n" /* start_address++ */
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"add #1,r6 \n" /* x++ */
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"cmp/hi r6,%2 \n" /* x < width ? */
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"bt .su_cloop \n"
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: /* outputs */
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@ -962,67 +1004,100 @@ void gray_scroll_up1(bool black_border)
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/* %2 */ "r"(graybuf->width),
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/* %3 */ "r"(graybuf->bheight),
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/* %4 */ "r"(graybuf->plane_size),
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/* %5 */ "r"(filler)
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/* %5 */ "r"(filler),
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/* %6 */ "r"(count)
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: /* clobbers */
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"r1", "r2", "r3", "r4", "r5", "r6", "r7"
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"r0", "r1", "r2", "r3", "r4", "r5", "r6"
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);
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}
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/* Scroll the whole grayscale buffer down by 1 pixel
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/* Scroll the whole grayscale buffer down by <count> pixels (<= 7)
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*
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* black_border determines if the pixels scrolled in at the top are black
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* or white
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*
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* Scrolling up/down pixel-wise is significantly slower than scrolling
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* left/right or scrolling up/down byte-wise because it involves bit
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* shifting. That's why it is asm optimized. Scrolling down is a bit
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* faster than scrolling up, though.
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* shifting. That's why it is asm optimized.
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*/
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void gray_scroll_down1(bool black_border)
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void gray_scroll_down(int count, bool black_border)
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{
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int filler;
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unsigned long filler;
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if (graybuf == NULL)
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if (graybuf == NULL || (unsigned) count > 7)
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return;
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if (black_border)
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filler = -1; /* sets bit 31 */
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filler = 0xFF << count; /* calculate filler bits */
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else
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filler = 0;
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/* scroll column by column to minimize flicker */
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asm(
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"mov #0,r5 \n" /* x = 0; */
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"mov #0,r6 \n" /* x = 0 */
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"mova .sd_shifttbl,r0 \n" /* calculate jump destination for */
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"mov.b @(r0,%6),%6 \n" /* shift amount from table */
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"bra .sd_cloop \n" /* skip table */
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"add r0,%6 \n"
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".align 2 \n"
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".sd_shifttbl: \n" /* shift jump offset table */
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".byte .sd_shift0 - .sd_shifttbl \n"
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".byte .sd_shift1 - .sd_shifttbl \n"
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".byte .sd_shift2 - .sd_shifttbl \n"
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".byte .sd_shift3 - .sd_shifttbl \n"
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".byte .sd_shift4 - .sd_shifttbl \n"
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".byte .sd_shift5 - .sd_shifttbl \n"
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".byte .sd_shift6 - .sd_shifttbl \n"
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".byte .sd_shift7 - .sd_shifttbl \n"
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".sd_cloop: \n" /* repeat for every column */
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"mov %1,r6 \n" /* get start address */
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"mov #0,r1 \n" /* current_plane = 0 */
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"mov %1,r2 \n" /* get start address */
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"mov #0,r3 \n" /* current_plane = 0 */
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".sd_oloop: \n" /* repeat for every bitplane */
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"mov r6,r2 \n" /* get start address */
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"mov #0,r3 \n" /* current_row = 0 */
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"mov %5,r4 \n" /* get filler bit (bit 31) */
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"mov r2,r4 \n" /* get start address */
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"mov #0,r5 \n" /* current_row = 0 */
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"mov %5,r1 \n" /* get filler bits */
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".sd_iloop: \n" /* repeat for all rows */
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"shll r4 \n" /* get old msb (again) */
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/* This is possible because the sh1 loads byte data sign-extended,
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* so the upper 25 bits of the register are all identical */
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"mov.b @r2,r4 \n" /* get new byte */
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"add #1,r3 \n" /* current_row++; */
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"rotcl r4 \n" /* rotate left, merges previous msb */
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"mov.b r4,@r2 \n" /* store byte */
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"add %2,r2 \n" /* address += width; */
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"cmp/hi r3,%3 \n" /* cuurent_row < bheight ? */
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"shlr8 r1 \n" /* shift right to get residue */
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"mov.b @r4,r0 \n" /* get data byte */
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"jmp @%6 \n" /* jump into shift "path" */
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"extu.b r0,r0 \n" /* extend unsigned */
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".sd_shift6: \n" /* shift left by 0..7 bits */
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"shll2 r0 \n"
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".sd_shift4: \n"
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"shll2 r0 \n"
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".sd_shift2: \n"
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"bra .sd_shift0 \n"
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"shll2 r0 \n"
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".sd_shift7: \n"
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"shll2 r0 \n"
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".sd_shift5: \n"
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"shll2 r0 \n"
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".sd_shift3: \n"
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"shll2 r0 \n"
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".sd_shift1: \n"
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"shll r0 \n"
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".sd_shift0: \n"
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"or r0,r1 \n" /* combine with last residue */
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"mov.b r1,@r4 \n" /* store data */
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"add %2,r4 \n" /* address += width */
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"add #1,r5 \n" /* current_row++ */
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"cmp/hi r5,%3 \n" /* current_row < bheight ? */
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"bt .sd_iloop \n"
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"add %4,r6 \n" /* start_address += plane_size; */
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"add #1,r1 \n" /* current_plane++; */
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"cmp/hi r1,%0 \n" /* current_plane < depth ? */
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"add %4,r2 \n" /* start_address += plane_size */
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"add #1,r3 \n" /* current_plane++ */
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"cmp/hi r3,%0 \n" /* current_plane < depth ? */
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"bt .sd_oloop \n"
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"add #1,%1 \n" /* start_address++; */
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"add #1,r5 \n" /* x++ */
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"cmp/hi r5,%2 \n" /* x < width ? */
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"add #1,%1 \n" /* start_address++ */
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"add #1,r6 \n" /* x++ */
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"cmp/hi r6,%2 \n" /* x < width ? */
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"bt .sd_cloop \n"
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: /* outputs */
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: /* inputs */
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@ -1031,9 +1106,10 @@ void gray_scroll_down1(bool black_border)
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/* %2 */ "r"(graybuf->width),
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/* %3 */ "r"(graybuf->bheight),
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/* %4 */ "r"(graybuf->plane_size),
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/* %5 */ "r"(filler)
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/* %5 */ "r"(filler),
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/* %6 */ "r"(count)
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: /* clobbers */
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"r1", "r2", "r3", "r4", "r5", "r6"
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"r0", "r1", "r2", "r3", "r4", "r5", "r6"
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);
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}
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@ -1715,12 +1791,12 @@ int main(void)
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case BUTTON_UP:
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gray_scroll_up1(black_border); /* scroll up by 1 pixel */
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gray_scroll_up(scroll_amount, black_border); /* scroll up */
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break;
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case BUTTON_DOWN:
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gray_scroll_down1(black_border); /* scroll down by 1 pixel */
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gray_scroll_down(scroll_amount, black_border); /* scroll down */
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break;
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case BUTTON_OFF:
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