auto import from //depot/cupcake/@135843

1 files changed, 62 insertions, 0 deletions

diff --git a/libpixelflinger/rotate90CW_4x4_16v6.S b/libpixelflinger/rotate90CW_4x4_16v6.S
new file mode 100644
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+++ b/libpixelflinger/rotate90CW_4x4_16v6.S
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+/*
+**
+** Copyright 2006, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+
+    .text
+    .align
+    
+    .global rotate90CW_4x4_16v6
+
+// Rotates 90deg CW a 4x4 block of 16bpp pixels using ARMv6
+// src and dst must be 4 pixels-aligned (2-pixels aligned might
+// actually work)
+//
+// The code below is complicated by ARM's little endianness. 
+
+rotate90CW_4x4_16v6:
+    // r0 = dst
+    // r1 = src
+    // r2 = dst stride in pixels
+    // r3 = src stride in pixels
+
+    stmfd   sp!, {r4,r5, r6,r7, r8,r9, r10,r11, lr}
+    add     r14, r3, r3
+    add     r12, r2, r2
+
+    ldrd    r2, r3, [r1], r14
+    ldrd    r4, r5, [r1], r14
+    ldrd    r6, r7, [r1], r14
+    ldrd    r8, r9, [r1]
+
+    pkhbt   r10, r8, r6, lsl #16
+    pkhbt   r11, r4, r2, lsl #16
+    strd    r10, r11, [r0], r12  
+
+    pkhtb   r10, r6, r8, asr #16
+    pkhtb   r11, r2, r4, asr #16
+
+    strd    r10, r11, [r0], r12  
+    pkhbt   r10, r9, r7, lsl #16
+    pkhbt   r11, r5, r3, lsl #16
+
+    strd    r10, r11, [r0], r12  
+
+    pkhtb   r10, r7, r9, asr #16
+    pkhtb   r11, r3, r5, asr #16
+    strd    r10, r11, [r0]
+
+    ldmfd   sp!, {r4,r5, r6,r7, r8,r9, r10,r11, pc}