mirror of
https://github.com/webmproject/libwebp.git
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94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
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// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Utilities for processing transparent channel.
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//
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// Author(s): Branimir Vasic (branimir.vasic@imgtec.com)
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// Djordje Pesut (djordje.pesut@imgtec.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_MIPS_DSP_R2)
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static int DispatchAlpha(const uint8_t* alpha, int alpha_stride,
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int width, int height,
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uint8_t* dst, int dst_stride) {
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uint32_t alpha_mask = 0xffffffff;
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int i, j, temp0;
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for (j = 0; j < height; ++j) {
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uint8_t* pdst = dst;
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const uint8_t* palpha = alpha;
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for (i = 0; i < (width >> 2); ++i) {
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int temp1, temp2, temp3;
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__asm__ volatile (
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"ulw %[temp0], 0(%[palpha]) \n\t"
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"addiu %[palpha], %[palpha], 4 \n\t"
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"addiu %[pdst], %[pdst], 16 \n\t"
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"srl %[temp1], %[temp0], 8 \n\t"
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"srl %[temp2], %[temp0], 16 \n\t"
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"srl %[temp3], %[temp0], 24 \n\t"
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"and %[alpha_mask], %[alpha_mask], %[temp0] \n\t"
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"sb %[temp0], -16(%[pdst]) \n\t"
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"sb %[temp1], -12(%[pdst]) \n\t"
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"sb %[temp2], -8(%[pdst]) \n\t"
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"sb %[temp3], -4(%[pdst]) \n\t"
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: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
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[temp3]"=&r"(temp3), [palpha]"+r"(palpha), [pdst]"+r"(pdst),
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[alpha_mask]"+r"(alpha_mask)
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:
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: "memory"
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);
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}
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for (i = 0; i < (width & 3); ++i) {
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__asm__ volatile (
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"lbu %[temp0], 0(%[palpha]) \n\t"
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"addiu %[palpha], %[palpha], 1 \n\t"
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"sb %[temp0], 0(%[pdst]) \n\t"
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"and %[alpha_mask], %[alpha_mask], %[temp0] \n\t"
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"addiu %[pdst], %[pdst], 4 \n\t"
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: [temp0]"=&r"(temp0), [palpha]"+r"(palpha), [pdst]"+r"(pdst),
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[alpha_mask]"+r"(alpha_mask)
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:
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: "memory"
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);
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}
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alpha += alpha_stride;
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dst += dst_stride;
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}
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__asm__ volatile (
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"ext %[temp0], %[alpha_mask], 0, 16 \n\t"
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"srl %[alpha_mask], %[alpha_mask], 16 \n\t"
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"and %[alpha_mask], %[alpha_mask], %[temp0] \n\t"
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"ext %[temp0], %[alpha_mask], 0, 8 \n\t"
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"srl %[alpha_mask], %[alpha_mask], 8 \n\t"
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"and %[alpha_mask], %[alpha_mask], %[temp0] \n\t"
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: [temp0]"=&r"(temp0), [alpha_mask]"+r"(alpha_mask)
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:
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);
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return (alpha_mask != 0xff);
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}
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#endif // WEBP_USE_MIPS_DSP_R2
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//------------------------------------------------------------------------------
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// Init function
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extern void WebPInitAlphaProcessingMIPSdspR2(void);
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void WebPInitAlphaProcessingMIPSdspR2(void) {
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#if defined(WEBP_USE_MIPS_DSP_R2)
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WebPDispatchAlpha = DispatchAlpha;
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#endif
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}
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