Initial messy ARM ASM work

1 files changed, 67 insertions, 0 deletions

diff --git a/libass/arm/blend_bitmaps.S b/libass/arm/blend_bitmaps.S
new file mode 100644
index 0000000..c72d923
--- /dev/null
+++ b/libass/arm/blend_bitmaps.S
@@ -0,0 +1,67 @@
+/*
+ * void add_bitmaps( uint8_t *dst, intptr_t dst_stride,
+ *                   uint8_t *src, intptr_t src_stride,
+ *                   intptr_t width, intptr_t height );
+*/
+
+#include "asm.S"
+
+.macro blend_func type
+function \type\()_bitmaps_arm
+    push   {r4-r7}
+    ldrd   r4, r5, [sp, #16]
+@.Lskip_prologue:
+    mla    r5, r5, r3, r2
+0: @ height loop
+    mov    r6, #0 @ x offset
+1: @ stride loop
+    ldr    r7, [r0, r6]
+    ldr    ip, [r2, r6]
+    uq\type\()8 ip, r7, ip
+    str    ip, [r0, r6]
+    add    r6, #4
+    cmp    r6, r4
+    blo    1b @ still in scan line
+    add    r0, r1
+    add    r2, r3
+    cmp    r2, r5
+    blo    0b
+    pop    {r4-r7}
+    bx     lr
+endfunc
+.endm
+
+blend_func add
+blend_func sub
+
+/*
+ * void mul_bitmaps( uint8_t *dst, intptr_t dst_stride,
+ *                   uint8_t *src1, intptr_t src1_stride,
+ *                   uint8_t *src2, intptr_t src2_stride,
+ *                   intptr_t width, intptr_t height );
+*/
+function mul_bitmaps_arm
+    mov r11, #255
+    push   {r4-r11}
+    ldrd   r4, r5, [sp, #32]
+    ldrd   r6, r7, [sp, #40]
+    mla    r7, r7, r3, r2 @ last address
+0: @ height loop
+    mov    r8, #0 @ x offset
+1: @ stride loop
+    ldrb   r9,  [r2, r8]
+    ldrb   r10, [r4, r8]
+    mla    r9, r9, r10, r11
+    asr    r9, r9, #8
+    strb   r9,  [r0, r8]
+    add r8, r8, #1
+    cmp r8, r6
+    blo 1b @ still in scan line
+    add r0, r1
+    add r2, r3
+    add r4, r5
+    cmp r2, r7
+    blo 0b
+    pop    {r4-r11}
+    bx     lr
+endfunc