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Diffstat (limited to 'backends/platform/wince/ARMscaler.s')
-rw-r--r-- | backends/platform/wince/ARMscaler.s | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/backends/platform/wince/ARMscaler.s b/backends/platform/wince/ARMscaler.s new file mode 100644 index 0000000000..3397674d2b --- /dev/null +++ b/backends/platform/wince/ARMscaler.s @@ -0,0 +1,184 @@ +@ ScummVM Scumm Interpreter +@ Copyright (C) 2007 The ScummVM project +@ +@ This program is free software; you can redistribute it and/or +@ modify it under the terms of the GNU General Public License +@ as published by the Free Software Foundation; either version 2 +@ of the License, or (at your option) any later version. +@ +@ This program is distributed in the hope that it will be useful, +@ but WITHOUT ANY WARRANTY; without even the implied warranty of +@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +@ GNU General Public License for more details. +@ +@ You should have received a copy of the GNU General Public License +@ along with this program; if not, write to the Free Software +@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +@ +@ $URL$ +@ $Id$ +@ +@ @author Robin Watts (robin@wss.co.uk) + + .text + + .global PocketPCHalfARM + + @ ARM implementation of PocketPCHalf scaler. + @ Scales a width x height block of 16bpp pixels from srcPtr to + @ dstPtr. srcPitch and dstPitch identify how to reach subsequent + @ lines. redblueMask and round allow for one routine to do both + @ 565 and 555 formats. +PocketPCHalfARM: + @ r0 = srcPtr + @ r1 = srcPitch + @ r2 = dstPtr + @ r3 = dstPitch + MOV r12,r13 + STMFD r13!,{r4-r11,r14} + LDMIA r12,{r4-r7} + @ r4 = width + @ r5 = height + @ r6 = redblueMask + @ r7 = round + + SUB r3,r3,r4 @ dstPitch -= width + SUBS r5,r5,#2 @ while ((height-=2) >= 0) + BLT end +height_loop: + + SUBS r11,r4,#8 @ r11= width_minus_8 + BLT thin + +width_loop: + @ unroll loop 4 times here + LDRH r8,[r0],r1 @ r8 = A = srcPtr[0] + LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch] + LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2] + LDRH r14,[r0],#2 @ r14= B = srcPtr[2] + + ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r + ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r + ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r + ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r + AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r + AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r + AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r + AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r + ADD r8, r8, r9 + ADD r8, r8, r12 + ADD r8, r8, r14 + ADD r8, r8, r7 @ r8 = summed pixels + rounding + AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r + ORR r10,r8, r8, LSR #16 @ r10= 0 | g | 0 | b | g | r + + LDRH r8,[r0],r1 @ r8 = A = srcPtr[0] + LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch] + LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2] + LDRH r14,[r0],#2 @ r14= B = srcPtr[2] + + STRH r10,[r2],#2 @ *dstPtr++ + + ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r + ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r + ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r + ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r + AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r + AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r + AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r + AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r + ADD r8, r8, r9 + ADD r8, r8, r12 + ADD r8, r8, r14 + ADD r8, r8, r7 @ r8 = summed pixels + rounding + AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r + ORR r10,r8, r8, LSR #16 @ r10= 0 | g | 0 | b | g | r + + LDRH r8,[r0],r1 @ r8 = A = srcPtr[0] + LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch] + LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2] + LDRH r14,[r0],#2 @ r14= B = srcPtr[2] + + STRH r10,[r2],#2 @ *dstPtr++ + + ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r + ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r + ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r + ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r + AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r + AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r + AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r + AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r + ADD r8, r8, r9 + ADD r8, r8, r12 + ADD r8, r8, r14 + ADD r8, r8, r7 @ r8 = summed pixels + rounding + AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r + ORR r10,r8, r8, LSR #16 @ r10= 0 | g | 0 | b | g | r + + LDRH r8,[r0],r1 @ r8 = A = srcPtr[0] + LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch] + LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2] + LDRH r14,[r0],#2 @ r14= B = srcPtr[2] + + STRH r10,[r2],#2 @ *dstPtr++ + + ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r + ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r + ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r + ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r + AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r + AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r + AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r + AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r + ADD r8, r8, r9 + ADD r8, r8, r12 + ADD r8, r8, r14 + ADD r8, r8, r7 @ r8 = summed pixels + rounding + AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r + ORR r10, r8, r8, LSR #16 @ r8 = 0 | g | 0 | b | g | r + + STRH r10,[r2],#2 @ *dstPtr++ + + SUBS r11,r11,#8 @ width_minus_8 -= 8 + BGE width_loop @ (width_minus_8 >= 0) => do 8+ more + +thin: + ADDS r11,r11,#8 @ r11= width + BEQ width_end @ if no more left to do, then bale +thin_lp: + @ single output pixels done in this bit + LDRH r8,[r0],r1 @ r8 = A = srcPtr[0] + LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch] + LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2] + LDRH r14,[r0],#2 @ r14= B = srcPtr[2] + + ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r + ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r + ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r + ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r + AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r + AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r + AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r + AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r + ADD r8, r8, r9 + ADD r8, r8, r12 + ADD r8, r8, r14 + ADD r8, r8, r7 @ r8 = summed pixels + rounding + AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r + ORR r8, r8, r8, LSR #16 @ r8 = 0 | g | 0 | b | g | r + + STRH r8,[r2],#2 @ *dstPtr++ + + SUBS r11,r11,#2 + BGT thin_lp +width_end: + ADD r2,r2,r3 @ dstPtr += dstPitch + ADD r0,r0,r1,LSL #1 @ srcPtr += 2*srcPitch + SUB r0,r0,r4,LSL #1 @ srcPtr -= 2*width + + SUBS r5,r5,#2 + BGE height_loop + +end: + LDMFD r13!,{r4-r11,PC} |