74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
// Modified from the SSE2 version to AltiVec/VMX for TenFourFox
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// Cameron Kaiser <classilla@floodgap.com>
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// MPL
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#ifdef TENFOURFOX_VMX
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#include <altivec.h>
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#include "yuv_row.h"
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#include <stdio.h>
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namespace mozilla {
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namespace gfx {
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// FilterRows combines two rows of the image using linear interpolation.
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// VMX version does 16 pixels at a time.
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void FilterRows_VMX(uint8* ybuf, const uint8* y0_ptr, const uint8* y1_ptr,
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int source_width, int source_y_fraction) {
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register vector unsigned short vector_zero = vec_splat_u16(0);
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register vector unsigned char r0, c0, c1;
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register vector unsigned short y0, y1, y2, y3;
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uint8 *end = ybuf + source_width;
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// Although you'd think using a version with vec_avg for 50% would
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// be profitable to write, in practice it doesn't seem to be used
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// much if at all, so this doesn't implement one.
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// Splat the multiplicands. AltiVec makes this unnecessarily difficult.
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unsigned short __attribute__ ((aligned(16))) syf = source_y_fraction;
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unsigned short __attribute__ ((aligned(16))) syf2 = (256 - source_y_fraction);
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register vector unsigned short y1_fraction = vec_lde(0, &syf);
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y1_fraction = vec_splat(y1_fraction, 0);
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register vector unsigned short y0_fraction = vec_lde(0, &syf2);
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y0_fraction = vec_splat(y0_fraction, 0);
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// Permute vector for combining shift and pack in one operation.
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// This effectively shifts each vector down by 8 bits and packs.
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register vector unsigned char vector_sh8pak =
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{ 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30 };
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// Compute a weighted average.
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do {
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c0 = vec_ld(0, y0_ptr);
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c1 = vec_ld(0, y1_ptr);
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// Expand to short, since vec_mladd does not exist for char (damn).
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y0 = vec_mergeh((vector unsigned char)vector_zero, c0);
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y1 = vec_mergeh((vector unsigned char)vector_zero, c1);
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y2 = vec_mergel((vector unsigned char)vector_zero, c0);
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y3 = vec_mergel((vector unsigned char)vector_zero, c1);
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// FUSED MULTIPLY ADD, BEYOTCHES! INTEL SUX!
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// Interleave the operations.
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y1 = vec_mladd(y1, y1_fraction, vector_zero);
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y3 = vec_mladd(y3, y1_fraction, vector_zero);
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y0 = vec_mladd(y0, y0_fraction, y1);
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y2 = vec_mladd(y2, y0_fraction, y3);
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// Turn vec_sr on y0/y2 and a vec_pack into a single op.
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r0 = vec_perm((vector unsigned char)y0, (vector unsigned char)y2, vector_sh8pak);
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vec_st(r0, 0, (unsigned char *)ybuf);
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ybuf += 16;
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y0_ptr += 16;
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y1_ptr += 16;
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} while (ybuf < end);
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}
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}
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}
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#endif // TENFOURFOX_VMX
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