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https://github.com/libretro/scummvm.git
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188 lines
6.1 KiB
ArmAsm
188 lines
6.1 KiB
ArmAsm
@ ScummVM - Graphic Adventure Engine
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@
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@ ScummVM is the legal property of its developers, whose names
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@ are too numerous to list here. Please refer to the COPYRIGHT
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@ file distributed with this source distribution.
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@
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@ This program is free software; you can redistribute it and/or
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@ modify it under the terms of the GNU General Public License
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@ as published by the Free Software Foundation; either version 2
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@ of the License, or (at your option) any later version.
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@
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@ This program is distributed in the hope that it will be useful,
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@ but WITHOUT ANY WARRANTY; without even the implied warranty of
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@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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@ GNU General Public License for more details.
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@
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@ You should have received a copy of the GNU General Public License
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@ along with this program; if not, write to the Free Software
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@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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@
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@ $URL$
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@ $Id$
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@
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@ @author Robin Watts (robin@wss.co.uk)
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.text
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.global DownscaleAllByHalfARM
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@ ARM implementation of DownscaleAllByHalf scaler.
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@ Scales a width x height block of 16bpp pixels from srcPtr to
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@ dstPtr. srcPitch and dstPitch identify how to reach subsequent
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@ lines. redblueMask and round allow for one routine to do both
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@ 565 and 555 formats.
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DownscaleAllByHalfARM:
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@ r0 = srcPtr
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@ r1 = srcPitch
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@ r2 = dstPtr
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@ r3 = dstPitch
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MOV r12,r13
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STMFD r13!,{r4-r11,r14}
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LDMIA r12,{r4-r7}
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@ r4 = width
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@ r5 = height
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@ r6 = redblueMask
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@ r7 = round
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SUB r3,r3,r4 @ dstPitch -= width
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SUBS r5,r5,#2 @ while ((height-=2) >= 0)
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BLT end
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height_loop:
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SUBS r11, r4, #8 @ r11= width_minus_8
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BLT thin
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width_loop:
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@ unroll loop 4 times here
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LDRH r8,[r0],r1 @ r8 = A = srcPtr[0]
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LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch]
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LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2]
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LDRH r14,[r0],#2 @ r14= B = srcPtr[2]
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ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r
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ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r
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ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r
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ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r
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AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r
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AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r
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AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r
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AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r
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ADD r8, r8, r9
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ADD r8, r8, r12
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ADD r8, r8, r14
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ADD r8, r8, r7 @ r8 = summed pixels + rounding
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AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r
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ORR r10,r8, r8, LSR #16 @ r10= 0 | g | 0 | b | g | r
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LDRH r8,[r0],r1 @ r8 = A = srcPtr[0]
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LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch]
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LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2]
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LDRH r14,[r0],#2 @ r14= B = srcPtr[2]
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STRH r10,[r2],#2 @ *dstPtr++
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ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r
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ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r
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ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r
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ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r
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AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r
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AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r
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AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r
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AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r
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ADD r8, r8, r9
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ADD r8, r8, r12
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ADD r8, r8, r14
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ADD r8, r8, r7 @ r8 = summed pixels + rounding
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AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r
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ORR r10,r8, r8, LSR #16 @ r10= 0 | g | 0 | b | g | r
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LDRH r8,[r0],r1 @ r8 = A = srcPtr[0]
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LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch]
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LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2]
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LDRH r14,[r0],#2 @ r14= B = srcPtr[2]
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STRH r10,[r2],#2 @ *dstPtr++
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ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r
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ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r
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ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r
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ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r
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AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r
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AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r
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AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r
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AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r
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ADD r8, r8, r9
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ADD r8, r8, r12
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ADD r8, r8, r14
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ADD r8, r8, r7 @ r8 = summed pixels + rounding
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AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r
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ORR r10,r8, r8, LSR #16 @ r10= 0 | g | 0 | b | g | r
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LDRH r8,[r0],r1 @ r8 = A = srcPtr[0]
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LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch]
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LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2]
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LDRH r14,[r0],#2 @ r14= B = srcPtr[2]
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STRH r10,[r2],#2 @ *dstPtr++
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ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r
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ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r
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ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r
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ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r
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AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r
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AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r
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AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r
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AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r
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ADD r8, r8, r9
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ADD r8, r8, r12
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ADD r8, r8, r14
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ADD r8, r8, r7 @ r8 = summed pixels + rounding
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AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r
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ORR r10, r8, r8, LSR #16 @ r8 = 0 | g | 0 | b | g | r
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STRH r10,[r2],#2 @ *dstPtr++
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SUBS r11,r11,#8 @ width_minus_8 -= 8
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BGE width_loop @ (width_minus_8 >= 0) => do 8+ more
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thin:
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ADDS r11,r11,#8 @ r11= width
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BEQ width_end @ if no more left to do, then bail
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thin_lp:
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@ single output pixels done in this bit
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LDRH r8,[r0],r1 @ r8 = A = srcPtr[0]
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LDRH r9,[r0],#2 @ r9 = C = srcPtr[dstPitch]
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LDRH r12,[r0],-r1 @ r12= D = srcPtr[dstPitch+2]
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LDRH r14,[r0],#2 @ r14= B = srcPtr[2]
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ORR r8, r8, r8, LSL #16 @ r8 = b | g | r | b | g | r
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ORR r9, r9, r9, LSL #16 @ r9 = b | g | r | b | g | r
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ORR r12,r12,r12,LSL #16 @ r12= b | g | r | b | g | r
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ORR r14,r14,r14,LSL #16 @ r14= b | g | r | b | g | r
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AND r8, r8, r6 @ r8 = 0 | g | 0 | b | 0 | r
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AND r9, r9, r6 @ r9 = 0 | g | 0 | b | 0 | r
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AND r12,r12,r6 @ r12= 0 | g | 0 | b | 0 | r
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AND r14,r14,r6 @ r14= 0 | g | 0 | b | 0 | r
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ADD r8, r8, r9
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ADD r8, r8, r12
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ADD r8, r8, r14
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ADD r8, r8, r7 @ r8 = summed pixels + rounding
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AND r8, r6, r8, LSR #2 @ r8 = 0 | g | 0 | b | 0 | r
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ORR r8, r8, r8, LSR #16 @ r8 = 0 | g | 0 | b | g | r
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STRH r8,[r2],#2 @ *dstPtr++
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SUBS r11,r11,#2
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BGT thin_lp
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width_end:
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ADD r2,r2,r3 @ dstPtr += dstPitch
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ADD r0,r0,r1,LSL #1 @ srcPtr += 2*srcPitch
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SUB r0,r0,r4,LSL #1 @ srcPtr -= 2*width
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SUBS r5,r5,#2
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BGE height_loop
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end:
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LDMFD r13!,{r4-r11,PC}
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