214 lines
5.8 KiB
ArmAsm
214 lines
5.8 KiB
ArmAsm
/*
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* Copyright (C) 2013 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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.text
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.balign 0
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.global scanline_t32cb16blend_arm64
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/*
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* .macro pixel
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*
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* This macro alpha blends RGB565 original pixel located in either
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* top or bottom 16 bits of DREG register with SRC 32 bit pixel value
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* and writes the result to FB register
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*
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* \DREG is a 32-bit register containing *two* original destination RGB565
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* pixels, with the even one in the low-16 bits, and the odd one in the
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* high 16 bits.
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*
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* \SRC is a 32-bit 0xAABBGGRR pixel value, with pre-multiplied colors.
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*
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* \FB is a target register that will contain the blended pixel values.
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*
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* \ODD is either 0 or 1 and indicates if we're blending the lower or
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* upper 16-bit pixels in DREG into FB
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*
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*
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* clobbered: w6, w7, w16, w17, w18
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*
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*/
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.macro pixel, DREG, SRC, FB, ODD
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// SRC = 0xAABBGGRR
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lsr w7, \SRC, #24 // sA
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add w7, w7, w7, lsr #7 // sA + (sA >> 7)
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mov w6, #0x100
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sub w7, w6, w7 // sA = 0x100 - (sA+(sA>>7))
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1:
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.if \ODD //Blending odd pixel present in top 16 bits of DREG register
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// red
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lsr w16, \DREG, #(16 + 11)
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mul w16, w7, w16
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lsr w6, \SRC, #3
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and w6, w6, #0x1F
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add w16, w6, w16, lsr #8
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cmp w16, #0x1F
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orr w17, \FB, #(0x1F<<(16 + 11))
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orr w18, \FB, w16, lsl #(16 + 11)
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csel \FB, w17, w18, hi
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// green
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and w6, \DREG, #(0x3F<<(16 + 5))
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lsr w17,w6,#(16+5)
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mul w6, w7, w17
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lsr w16, \SRC, #(8+2)
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and w16, w16, #0x3F
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add w6, w16, w6, lsr #8
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cmp w6, #0x3F
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orr w17, \FB, #(0x3F<<(16 + 5))
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orr w18, \FB, w6, lsl #(16 + 5)
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csel \FB, w17, w18, hi
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// blue
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and w16, \DREG, #(0x1F << 16)
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lsr w17,w16,#16
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mul w16, w7, w17
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lsr w6, \SRC, #(8+8+3)
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and w6, w6, #0x1F
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add w16, w6, w16, lsr #8
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cmp w16, #0x1F
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orr w17, \FB, #(0x1F << 16)
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orr w18, \FB, w16, lsl #16
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csel \FB, w17, w18, hi
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.else //Blending even pixel present in bottom 16 bits of DREG register
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// red
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lsr w16, \DREG, #11
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and w16, w16, #0x1F
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mul w16, w7, w16
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lsr w6, \SRC, #3
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and w6, w6, #0x1F
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add w16, w6, w16, lsr #8
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cmp w16, #0x1F
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mov w17, #(0x1F<<11)
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lsl w18, w16, #11
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csel \FB, w17, w18, hi
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// green
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and w6, \DREG, #(0x3F<<5)
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mul w6, w7, w6
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lsr w16, \SRC, #(8+2)
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and w16, w16, #0x3F
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add w6, w16, w6, lsr #(5+8)
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cmp w6, #0x3F
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orr w17, \FB, #(0x3F<<5)
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orr w18, \FB, w6, lsl #5
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csel \FB, w17, w18, hi
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// blue
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and w16, \DREG, #0x1F
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mul w16, w7, w16
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lsr w6, \SRC, #(8+8+3)
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and w6, w6, #0x1F
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add w16, w6, w16, lsr #8
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cmp w16, #0x1F
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orr w17, \FB, #0x1F
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orr w18, \FB, w16
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csel \FB, w17, w18, hi
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.endif // End of blending even pixel
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.endm // End of pixel macro
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// x0: dst ptr
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// x1: src ptr
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// w2: count
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// w3: d
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// w4: s0
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// w5: s1
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// w6: pixel
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// w7: pixel
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// w8: free
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// w9: free
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// w10: free
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// w11: free
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// w12: scratch
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// w14: pixel
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scanline_t32cb16blend_arm64:
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// align DST to 32 bits
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tst x0, #0x3
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b.eq aligned
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subs w2, w2, #1
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b.lo return
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last:
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ldr w4, [x1], #4
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ldrh w3, [x0]
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pixel w3, w4, w12, 0
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strh w12, [x0], #2
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aligned:
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subs w2, w2, #2
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b.lo 9f
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// The main loop is unrolled twice and processes 4 pixels
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8:
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ldp w4,w5, [x1], #8
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add x0, x0, #4
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// it's all zero, skip this pixel
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orr w3, w4, w5
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cbz w3, 7f
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// load the destination
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ldr w3, [x0, #-4]
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// stream the destination
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pixel w3, w4, w12, 0
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pixel w3, w5, w12, 1
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str w12, [x0, #-4]
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// 2nd iteration of the loop, don't stream anything
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subs w2, w2, #2
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csel w4, w5, w4, lt
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blt 9f
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ldp w4,w5, [x1], #8
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add x0, x0, #4
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orr w3, w4, w5
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cbz w3, 7f
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ldr w3, [x0, #-4]
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pixel w3, w4, w12, 0
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pixel w3, w5, w12, 1
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str w12, [x0, #-4]
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7: subs w2, w2, #2
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bhs 8b
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mov w4, w5
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9: adds w2, w2, #1
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b.lo return
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b last
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return:
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ret
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