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author | Robin Watts | 2008-08-18 20:04:15 +0000 |
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committer | Robin Watts | 2008-08-18 20:04:15 +0000 |
commit | 90b59af2bae2be6cd0a4cafddb01cdabc7bba01f (patch) | |
tree | b5548c1364a075e04f530db9cdcffa30dff544e1 /backends/platform | |
parent | ca3dcdfd4e5816fd825e6f77789450f721bf22a4 (diff) | |
download | scummvm-rg350-90b59af2bae2be6cd0a4cafddb01cdabc7bba01f.tar.gz scummvm-rg350-90b59af2bae2be6cd0a4cafddb01cdabc7bba01f.tar.bz2 scummvm-rg350-90b59af2bae2be6cd0a4cafddb01cdabc7bba01f.zip |
Updates to the scummvm blitting code as discussed on the mailing list.
1) Remove DS version of the ARM blitters in favour of the 'normal' ARM one.
2) Update normal ARM blitter to use Carlo's clever algorithm.
3) Update C version with Max Horns patch (slightly tweaked - counting down
on loops is better, M'kay).
svn-id: r34006
Diffstat (limited to 'backends/platform')
-rw-r--r-- | backends/platform/ds/arm9/source/blitters_arm.s | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/backends/platform/ds/arm9/source/blitters_arm.s b/backends/platform/ds/arm9/source/blitters_arm.s index 5f7df298b4..48ec316675 100644 --- a/backends/platform/ds/arm9/source/blitters_arm.s +++ b/backends/platform/ds/arm9/source/blitters_arm.s @@ -20,149 +20,12 @@ @ @ @author Robin Watts (robin@wss.co.uk) - .global asmDrawStripToScreen - .global asmCopy8Col .global Rescale_320x256xPAL8_To_256x256x1555 .global Rescale_320x256x1555_To_256x256x1555 .section .itcm,"ax", %progbits .align 2 .code 32 - @ ARM implementation of asmDrawStripToScreen. - @ - @ C prototype would be: - @ - @ extern "C" void asmDrawStripToScreen(int height, - @ int width, - @ byte const *text, - @ byte const *src, - @ byte *dst, - @ int vsPitch, - @ int vsScreenWidth, - @ int textSurfacePitch); - @ - @ In addition, we assume that text, src and dst are all word (4 byte) - @ aligned. This is the same assumption that the old 'inline' version - @ made. -asmDrawStripToScreen: - @ r0 = height - @ r1 = width - @ r2 = text - @ r3 = src - MOV r12,r13 - STMFD r13!,{r4-r7,r9-r11,R14} - LDMIA r12,{r4,r5,r6,r7} - @ r4 = dst - @ r5 = vsPitch - @ r6 = vmScreenWidth - @ r7 = textSurfacePitch - - CMP r0,#0 @ If height<=0 - MOVLE r0,#1 @ height=1 - CMP r1,#4 @ If width<4 - BLT end @ return - - @ Width &= ~4 ? What's that about then? Width &= ~3 I could have - @ understood... - BIC r1,r1,#4 - - SUB r5,r5,r1 @ vsPitch -= width - SUB r6,r6,r1 @ vmScreenWidth -= width - SUB r7,r7,r1 @ textSurfacePitch -= width - MOV r10,#253 - ORR r10,r10,r10,LSL #8 - ORR r10,r10,r10,LSL #16 @ r10 = mask -yLoop: - MOV r14,r1 @ r14 = width -xLoop: - LDR r12,[r2],#4 @ r12 = [text] - LDR r11,[r3],#4 @ r11 = [src] - CMP r12,r10 - BNE singleByteCompare - SUBS r14,r14,#4 - STR r11,[r4], #4 @ r4 = [dst] - BGT xLoop - - ADD r2,r2,r7 @ text += textSurfacePitch - ADD r3,r3,r5 @ src += vsPitch - ADD r4,r4,r6 @ dst += vmScreenWidth - SUBS r0,r0,#1 - BGT yLoop - LDMFD r13!,{r4-r7,r9-r11,PC} - -singleByteCompare: - MOV r9,r12,LSR #24 @ r9 = 1st byte of [text] - CMP r9,r10,LSR #24 @ if (r9 == mask) - MOVEQ r9,r11,LSR #24 @ r9 = 1st byte of [src] - ORR r12,r9,r12,LSL #8 @ r12 = combine r9 and r12 - - MOV r9,r12,LSR #24 @ r9 = 1st byte of [text] - CMP r9,r10,LSR #24 @ if (r9 == mask) - MOVEQ r9,r11,LSR #24 @ r9 = 1st byte of [src] - ORR r12,r9,r12,LSL #8 @ r12 = combine r9 and r12 - - MOV r9,r12,LSR #24 @ r9 = 1st byte of [text] - CMP r9,r10,LSR #24 @ if (r9 == mask) - MOVEQ r9,r11,LSR #24 @ r9 = 1st byte of [src] - ORR r12,r9,r12,LSL #8 @ r12 = combine r9 and r12 - - MOV r9,r12,LSR #24 @ r9 = 1st byte of [text] - CMP r9,r10,LSR #24 @ if (r9 == mask) - MOVEQ r9,r11,LSR #24 @ r9 = 1st byte of [src] - ORR r12,r9,r12,LSL #8 @ r12 = combine r9 and r12 - - STR r12,[r4],#4 - SUBS r14,r14,#4 - BGT xLoop - - ADD r2,r2,r7 @ text += textSurfacePitch - ADD r3,r3,r5 @ src += vsPitch - ADD r4,r4,r6 @ dst += vmScreenWidth - SUBS r0,r0,#1 - BGT yLoop -end: - LDMFD r13!,{r4-r7,r9-r11,PC} - - - @ ARM implementation of asmCopy8Col - @ - @ C prototype would be: - @ - @ extern "C" void asmCopy8Col(byte *dst, - @ int dstPitch, - @ const byte *src, - @ int height); - @ - @ In addition, we assume that src and dst are both word (4 byte) - @ aligned. This is the same assumption that the old 'inline' version - @ made. -asmCopy8Col: - @ r0 = dst - @ r1 = dstPitch - @ r2 = src - @ r3 = height - STMFD r13!,{r14} - SUB r1,r1,#4 - - TST r3,#1 - ADDNE r3,r3,#1 - BNE roll2 -yLoop2: - LDR r12,[r2],#4 - LDR r14,[r2],r1 - STR r12,[r0],#4 - STR r14,[r0],r1 -roll2: - LDR r12,[r2],#4 - LDR r14,[r2],r1 - SUBS r3,r3,#2 - STR r12,[r0],#4 - STR r14,[r0],r1 - BNE yLoop2 - - LDMFD r13!,{PC} - - @ ARM implementation of Rescale_320x256x1555_To_256x256x1555 @ @ C prototype would be: |