text: /*
   * Copyright 2014 The Android Open Source Project
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  
  #include "SkBitmapProcState.h"
  #include "SkBitmapScaler.h"
  #include "SkColorPriv.h"
  #include "SkPaint.h"
  #include "SkUtils.h"
  
  static void SI8_D16_nofilter_DX_mips_dsp(const SkBitmapProcState& s,
                                           const uint32_t* SK_RESTRICT xy,
                                           int count, uint16_t* SK_RESTRICT colors) {
      SkASSERT(count > 0 && colors != NULL);
      SkASSERT(s.fInvType <= (SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask));
      SkASSERT(SkPaint::kNone_FilterLevel == s.fFilterLevel);
      const uint16_t* SK_RESTRICT table = s.fBitmap->getColorTable()->lock16BitCache();
      const uint8_t* SK_RESTRICT srcAddr = (const uint8_t*)s.fBitmap->getPixels();
      SkASSERT((unsigned)xy[0] < (unsigned)s.fBitmap->height());
      srcAddr = (const uint8_t*)((const char*)srcAddr + xy[0] * s.fBitmap->rowBytes());
      uint8_t src;
  
      if (1 == s.fBitmap->width()) {
          src = srcAddr[0];
          uint16_t dstValue = table[src];
          sk_memset16(colors, dstValue, count);
      } else {
          int count8;
          const uint16_t* SK_RESTRICT xx = (const uint16_t*)(xy + 1);
  
          __asm__ volatile (
              ".set    push                                \n\t"
              ".set    noreorder                           \n\t"
              ".set    noat                                \n\t"
              "sra     %[count8], %[count],      3         \n\t"
              "beqz    %[count8], 3f                       \n\t"
              " addiu  %[count8], %[count8],     -1        \n\t"
          "1:                                              \n\t"
              "beqz    %[count8], 2f                       \n\t"
              " addiu  %[count8], %[count8],     -1        \n\t"
              "pref    0,         16(%[xx])                \n\t"
              "lhu     $t0,       0(%[xx])                 \n\t"
              "lhu     $t1,       2(%[xx])                 \n\t"
              "lhu     $t2,       4(%[xx])                 \n\t"
              "lhu     $t3,       6(%[xx])                 \n\t"
              "lhu     $t4,       8(%[xx])                 \n\t"
              "lhu     $t5,       10(%[xx])                \n\t"
              "lhu     $t6,       12(%[xx])                \n\t"
              "lhu     $t7,       14(%[xx])                \n\t"
              "pref    0,         8(%[srcAddr])            \n\t"
              "lbux    $t0,       $t0(%[srcAddr])          \n\t"
              "lbux    $t1,       $t1(%[srcAddr])          \n\t"
              "lbux    $t2,       $t2(%[srcAddr])          \n\t"
              "lbux    $t3,       $t3(%[srcAddr])          \n\t"
              "lbux    $t4,       $t4(%[srcAddr])          \n\t"
              "lbux    $t5,       $t5(%[srcAddr])          \n\t"
              "lbux    $t6,       $t6(%[srcAddr])          \n\t"
              "lbux    $t7,       $t7(%[srcAddr])          \n\t"
              "addu    $t0,       $t0,           $t0       \n\t"
              "addu    $t1,       $t1,           $t1       \n\t"
              "addu    $t2,       $t2,           $t2       \n\t"
              "addu    $t3,       $t3,           $t3       \n\t"
              "addu    $t4,       $t4,           $t4       \n\t"
              "addu    $t5,       $t5,           $t5       \n\t"
              "addu    $t6,       $t6,           $t6       \n\t"
              "addu    $t7,       $t7,           $t7       \n\t"
              "pref    0,         16(%[table])             \n\t"
              "lhx     $t0,       $t0(%[table])            \n\t"
              "lhx     $t1,       $t1(%[table])            \n\t"
              "lhx     $t2,       $t2(%[table])            \n\t"
              "lhx     $t3,       $t3(%[table])            \n\t"
              "lhx     $t4,       $t4(%[table])            \n\t"
              "lhx     $t5,       $t5(%[table])            \n\t"
              "lhx     $t6,       $t6(%[table])            \n\t"
              "lhx     $t7,       $t7(%[table])            \n\t"
              "sh      $t0,       0(%[colors])             \n\t"
              "sh      $t1,       2(%[colors])             \n\t"
              "sh      $t2,       4(%[colors])             \n\t"
              "sh      $t3,       6(%[colors])             \n\t"
              "sh      $t4,       8(%[colors])             \n\t"
              "sh      $t5,       10(%[colors])            \n\t"
              "sh      $t6,       12(%[colors])            \n\t"
              "sh      $t7,       14(%[colors])            \n\t"
              "addiu   %[xx],     %[xx],         16        \n\t"
              "bgtz    %[count8], 1b                       \n\t"
              " addiu  %[colors], %[colors],     16        \n\t"
          "2:                                              \n\t"
              "lhu     $t0,       0(%[xx])                 \n\t"
              "lhu     $t1,       2(%[xx])                 \n\t"
              "lhu     $t2,       4(%[xx])                 \n\t"
              "lhu     $t3,       6(%[xx])                 \n\t"
              "lhu     $t4,       8(%[xx])                 \n\t"
              "lhu     $t5,       10(%[xx])                \n\t"
              "lhu     $t6,       12(%[xx])                \n\t"
              "lhu     $t7,       14(%[xx])                \n\t"
              "lbux    $t0,       $t0(%[srcAddr])          \n\t"
              "lbux    $t1,       $t1(%[srcAddr])          \n\t"
              "lbux    $t2,       $t2(%[srcAddr])          \n\t"
              "lbux    $t3,       $t3(%[srcAddr])          \n\t"
              "lbux    $t4,       $t4(%[srcAddr])          \n\t"
              "lbux    $t5,       $t5(%[srcAddr])          \n\t"
              "lbux    $t6,       $t6(%[srcAddr])          \n\t"
              "lbux    $t7,       $t7(%[srcAddr])          \n\t"
              "addu    $t0,       $t0,           $t0       \n\t"
              "addu    $t1,       $t1,           $t1       \n\t"
              "addu    $t2,       $t2,           $t2       \n\t"
              "addu    $t3,       $t3,           $t3       \n\t"
              "addu    $t4,       $t4,           $t4       \n\t"
              "addu    $t5,       $t5,           $t5       \n\t"
              "addu    $t6,       $t6,           $t6       \n\t"
              "addu    $t7,       $t7,           $t7       \n\t"
              "lhx     $t0,       $t0(%[table])            \n\t"
              "lhx     $t1,       $t1(%[table])            \n\t"
              "lhx     $t2,       $t2(%[table])            \n\t"
              "lhx     $t3,       $t3(%[table])            \n\t"
              "lhx     $t4,       $t4(%[table])            \n\t"
              "lhx     $t5,       $t5(%[table])            \n\t"
              "lhx     $t6,       $t6(%[table])            \n\t"
              "lhx     $t7,       $t7(%[table])            \n\t"
              "sh      $t0,       0(%[colors])             \n\t"
              "sh      $t1,       2(%[colors])             \n\t"
              "sh      $t2,       4(%[colors])             \n\t"
              "sh      $t3,       6(%[colors])             \n\t"
              "sh      $t4,       8(%[colors])             \n\t"
              "sh      $t5,       10(%[colors])            \n\t"
              "sh      $t6,       12(%[colors])            \n\t"
              "sh      $t7,       14(%[colors])            \n\t"
              "addiu   %[xx],     %[xx],         16        \n\t"
              "addiu   %[colors], %[colors],     16        \n\t"
          "3:                                              \n\t"
              ".set    pop                                 \n\t"
              : [xx]"+r"(xx), [count8]"=&r"(count8), [colors]"+r"(colors)
              : [table]"r"(table), [srcAddr]"r"(srcAddr), [count]"r"(count)
              : "memory","t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7"
          );
  
          for (int i = (count & 7); i > 0; --i) {
              src = srcAddr[*xx++]; *colors++ = table[src];
          }
      }
      s.fBitmap->getColorTable()->unlock16BitCache();
  }
  
  static void SI8_opaque_D32_nofilter_DX_mips_dsp(const SkBitmapProcState& s,
                                                  const uint32_t* SK_RESTRICT xy,
                                                  int count, SkPMColor* SK_RESTRICT colors) {
      SkASSERT(count > 0 && colors != NULL);
      SkASSERT(s.fInvType <= (SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask));
      SkASSERT(SkPaint::kNone_FilterLevel == s.fFilterLevel);
      const SkPMColor* SK_RESTRICT table = s.fBitmap->getColorTable()->lockColors();
      const uint8_t* SK_RESTRICT srcAddr = (const uint8_t*)s.fBitmap->getPixels();
      srcAddr = (const uint8_t*)((const char*)srcAddr + xy[0] * s.fBitmap->rowBytes());
  
      if (1 == s.fBitmap->width()) {
          uint8_t src = srcAddr[0];
          SkPMColor dstValue = table[src];
          sk_memset32(colors, dstValue, count);
      } else {
          const uint16_t* xx = (const uint16_t*)(xy + 1);
          int s0, s1, s2, s3, s4, s5, s6, s7;
          __asm__ volatile (
              ".set    push                                \n\t"
              ".set    noreorder                           \n\t"
              ".set    noat                                \n\t"
              "srl     $t8,       %[count],    4           \n\t"
              "beqz    $t8,       3f                       \n\t"
              " nop                                        \n\t"
          "1:                                              \n\t"
              "addiu   $t8,       $t8,         -1          \n\t"
              "beqz    $t8,       2f                       \n\t"
              " addiu  %[count],  %[count],    -16         \n\t"
              "pref    0,         32(%[xx])                \n\t"
              "lhu     $t0,       0(%[xx])                 \n\t"
              "lhu     $t1,       2(%[xx])                 \n\t"
              "lhu     $t2,       4(%[xx])                 \n\t"
              "lhu     $t3,       6(%[xx])                 \n\t"
              "lhu     $t4,       8(%[xx])                 \n\t"
              "lhu     $t5,       10(%[xx])                \n\t"
              "lhu     $t6,       12(%[xx])                \n\t"
              "lhu     $t7,       14(%[xx])                \n\t"
              "lhu     %[s0],     16(%[xx])                \n\t"
              "lhu     %[s1],     18(%[xx])                \n\t"
              "lhu     %[s2],     20(%[xx])                \n\t"
              "lhu     %[s3],     22(%[xx])                \n\t"
              "lhu     %[s4],     24(%[xx])                \n\t"
              "lhu     %[s5],     26(%[xx])                \n\t"
              "lhu     %[s6],     28(%[xx])                \n\t"
              "lhu     %[s7],     30(%[xx])                \n\t"
              "lbux    $t0,       $t0(%[srcAddr])          \n\t"
              "lbux    $t1,       $t1(%[srcAddr])          \n\t"
              "lbux    $t2,       $t2(%[srcAddr])          \n\t"
              "lbux    $t3,       $t3(%[srcAddr])          \n\t"
              "lbux    $t4,       $t4(%[srcAddr])          \n\t"
              "lbux    $t5,       $t5(%[srcAddr])          \n\t"
              "lbux    $t6,       $t6(%[srcAddr])          \n\t"
              "lbux    $t7,       $t7(%[srcAddr])          \n\t"
              "lbux    %[s0],     %[s0](%[srcAddr])        \n\t"
              "lbux    %[s1],     %[s1](%[srcAddr])        \n\t"
              "lbux    %[s2],     %[s2](%[srcAddr])        \n\t"
              "lbux    %[s3],     %[s3](%[srcAddr])        \n\t"
              "lbux    %[s4],     %[s4](%[srcAddr])        \n\t"
              "lbux    %[s5],     %[s5](%[srcAddr])        \n\t"
              "lbux    %[s6],     %[s6](%[srcAddr])        \n\t"
              "lbux    %[s7],     %[s7](%[srcAddr])        \n\t"
              "sll     $t0,       $t0,         2           \n\t"
              "sll     $t1,       $t1,         2           \n\t"
              "sll     $t2,       $t2,         2           \n\t"
              "sll     $t3,       $t3,         2           \n\t"
              "sll     $t4,       $t4,         2           \n\t"
              "sll     $t5,       $t5,         2           \n\t"
              "sll     $t6,       $t6,         2           \n\t"
              "sll     $t7,       $t7,         2           \n\t"
              "sll     %[s0],     %[s0],       2           \n\t"
              "sll     %[s1],     %[s1],       2           \n\t"
              "sll     %[s2],     %[s2],       2           \n\t"
              "sll     %[s3],     %[s3],       2           \n\t"
              "sll     %[s4],     %[s4],       2           \n\t"
              "sll     %[s5],     %[s5],       2           \n\t"
              "sll     %[s6],     %[s6],       2           \n\t"
              "sll     %[s7],     %[s7],       2           \n\t"
              "pref    0,         64(%[table])             \n\t"
              "lwx     $t0,       $t0(%[table])            \n\t"
              "lwx     $t1,       $t1(%[table])            \n\t"
              "lwx     $t2,       $t2(%[table])            \n\t"
              "lwx     $t3,       $t3(%[table])            \n\t"
              "lwx     $t4,       $t4(%[table])            \n\t"
              "lwx     $t5,       $t5(%[table])            \n\t"
              "lwx     $t6,       $t6(%[table])            \n\t"
              "lwx     $t7,       $t7(%[table])            \n\t"
              "lwx     %[s0],     %[s0](%[table])          \n\t"
              "lwx     %[s1],     %[s1](%[table])          \n\t"
              "lwx     %[s2],     %[s2](%[table])          \n\t"
              "lwx     %[s3],     %[s3](%[table])          \n\t"
              "lwx     %[s4],     %[s4](%[table])          \n\t"
              "lwx     %[s5],     %[s5](%[table])          \n\t"
              "lwx     %[s6],     %[s6](%[table])          \n\t"
              "lwx     %[s7],     %[s7](%[table])          \n\t"
              "pref    30,        64(%[colors])            \n\t"
              "sw      $t0,       0(%[colors])             \n\t"
              "sw      $t1,       4(%[colors])             \n\t"
              "sw      $t2,       8(%[colors])             \n\t"
              "sw      $t3,       12(%[colors])            \n\t"
              "sw      $t4,       16(%[colors])            \n\t"
              "sw      $t5,       20(%[colors])            \n\t"
              "sw      $t6,       24(%[colors])            \n\t"
              "sw      $t7,       28(%[colors])            \n\t"
              "sw      %[s0],     32(%[colors])            \n\t"
              "sw      %[s1],     36(%[colors])            \n\t"
              "sw      %[s2],     40(%[colors])            \n\t"
              "sw      %[s3],     44(%[colors])            \n\t"
              "sw      %[s4],     48(%[colors])            \n\t"
              "sw      %[s5],     52(%[colors])            \n\t"
              "sw      %[s6],     56(%[colors])            \n\t"
              "sw      %[s7],     60(%[colors])            \n\t"
              "addiu   %[xx],     %[xx],       32          \n\t"
              "b       1b                                  \n\t"
              " addiu  %[colors], %[colors],   64          \n\t"
          "2:                                              \n\t"
              "lhu     $t0,       0(%[xx])                 \n\t"
              "lhu     $t1,       2(%[xx])                 \n\t"
              "lhu     $t2,       4(%[xx])                 \n\t"
              "lhu     $t3,       6(%[xx])                 \n\t"
              "lhu     $t4,       8(%[xx])                 \n\t"
              "lhu     $t5,       10(%[xx])                \n\t"
              "lhu     $t6,       12(%[xx])                \n\t"
              "lhu     $t7,       14(%[xx])                \n\t"
              "lhu     %[s0],     16(%[xx])                \n\t"
              "lhu     %[s1],     18(%[xx])                \n\t"
              "lhu     %[s2],     20(%[xx])                \n\t"
              "lhu     %[s3],     22(%[xx])                \n\t"
              "lhu     %[s4],     24(%[xx])                \n\t"
              "lhu     %[s5],     26(%[xx])                \n\t"
              "lhu     %[s6],     28(%[xx])                \n\t"
              "lhu     %[s7],     30(%[xx])                \n\t"
              "lbux    $t0,       $t0(%[srcAddr])          \n\t"
              "lbux    $t1,       $t1(%[srcAddr])          \n\t"
              "lbux    $t2,       $t2(%[srcAddr])          \n\t"
              "lbux    $t3,       $t3(%[srcAddr])          \n\t"
              "lbux    $t4,       $t4(%[srcAddr])          \n\t"
              "lbux    $t5,       $t5(%[srcAddr])          \n\t"
              "lbux    $t6,       $t6(%[srcAddr])          \n\t"
              "lbux    $t7,       $t7(%[srcAddr])          \n\t"
              "lbux    %[s0],     %[s0](%[srcAddr])        \n\t"
              "lbux    %[s1],     %[s1](%[srcAddr])        \n\t"
              "lbux    %[s2],     %[s2](%[srcAddr])        \n\t"
              "lbux    %[s3],     %[s3](%[srcAddr])        \n\t"
              "lbux    %[s4],     %[s4](%[srcAddr])        \n\t"
              "lbux    %[s5],     %[s5](%[srcAddr])        \n\t"
              "lbux    %[s6],     %[s6](%[srcAddr])        \n\t"
              "lbux    %[s7],     %[s7](%[srcAddr])        \n\t"
              "sll     $t0,       $t0,         2           \n\t"
              "sll     $t1,       $t1,         2           \n\t"
              "sll     $t2,       $t2,         2           \n\t"
              "sll     $t3,       $t3,         2           \n\t"
              "sll     $t4,       $t4,         2           \n\t"
              "sll     $t5,       $t5,         2           \n\t"
              "sll     $t6,       $t6,         2           \n\t"
              "sll     $t7,       $t7,         2           \n\t"
              "sll     %[s0],     %[s0],       2           \n\t"
              "sll     %[s1],     %[s1],       2           \n\t"
              "sll     %[s2],     %[s2],       2           \n\t"
              "sll     %[s3],     %[s3],       2           \n\t"
              "sll     %[s4],     %[s4],       2           \n\t"
              "sll     %[s5],     %[s5],       2           \n\t"
              "sll     %[s6],     %[s6],       2           \n\t"
              "sll     %[s7],     %[s7],       2           \n\t"
              "lwx     $t0,       $t0(%[table])            \n\t"
              "lwx     $t1,       $t1(%[table])            \n\t"
              "lwx     $t2,       $t2(%[table])            \n\t"
              "lwx     $t3,       $t3(%[table])            \n\t"
              "lwx     $t4,       $t4(%[table])            \n\t"
              "lwx     $t5,       $t5(%[table])            \n\t"
              "lwx     $t6,       $t6(%[table])            \n\t"
              "lwx     $t7,       $t7(%[table])            \n\t"
              "lwx     %[s0],     %[s0](%[table])          \n\t"
              "lwx     %[s1],     %[s1](%[table])          \n\t"
              "lwx     %[s2],     %[s2](%[table])          \n\t"
              "lwx     %[s3],     %[s3](%[table])          \n\t"
              "lwx     %[s4],     %[s4](%[table])          \n\t"
              "lwx     %[s5],     %[s5](%[table])          \n\t"
              "lwx     %[s6],     %[s6](%[table])          \n\t"
              "lwx     %[s7],     %[s7](%[table])          \n\t"
              "sw      $t0,       0(%[colors])             \n\t"
              "sw      $t1,       4(%[colors])             \n\t"
              "sw      $t2,       8(%[colors])             \n\t"
              "sw      $t3,       12(%[colors])            \n\t"
              "sw      $t4,       16(%[colors])            \n\t"
              "sw      $t5,       20(%[colors])            \n\t"
              "sw      $t6,       24(%[colors])            \n\t"
              "sw      $t7,       28(%[colors])            \n\t"
              "sw      %[s0],     32(%[colors])            \n\t"
              "sw      %[s1],     36(%[colors])            \n\t"
              "sw      %[s2],     40(%[colors])            \n\t"
              "sw      %[s3],     44(%[colors])            \n\t"
              "sw      %[s4],     48(%[colors])            \n\t"
              "sw      %[s5],     52(%[colors])            \n\t"
              "sw      %[s6],     56(%[colors])            \n\t"
              "sw      %[s7],     60(%[colors])            \n\t"
              "addiu   %[xx],     %[xx],       32          \n\t"
              "beqz    %[count],  4f                       \n\t"
              " addiu  %[colors], %[colors],   64          \n\t"
          "3:                                              \n\t"
              "addiu   %[count],  %[count],    -1          \n\t"
              "lhu     $t0,       0(%[xx])                 \n\t"
              "lbux    $t1,       $t0(%[srcAddr])          \n\t"
              "sll     $t1,       $t1,         2           \n\t"
              "lwx     $t2,       $t1(%[table])            \n\t"
              "sw      $t2,       0(%[colors])             \n\t"
              "addiu   %[xx],     %[xx],       2           \n\t"
              "bnez    %[count],  3b                       \n\t"
              " addiu  %[colors], %[colors],   4           \n\t"
          "4:                                              \n\t"
              ".set    pop                                 \n\t"
              : [xx]"+r"(xx), [count]"+r"(count), [colors]"+r"(colors),
                [s0]"=&r"(s0), [s1]"=&r"(s1), [s2]"=&r"(s2), [s3]"=&r"(s3),
                [s4]"=&r"(s4), [s5]"=&r"(s5), [s6]"=&r"(s6), [s7]"=&r"(s7)
              : [table]"r"(table), [srcAddr]"r"(srcAddr)
              : "memory", "t0", "t1", "t2", "t3",
                "t4", "t5", "t6", "t7", "t8"
          );
      }
      s.fBitmap->getColorTable()->unlockColors();
  }
  
  /*  If we replace a sampleproc, then we null-out the associated shaderproc,
      otherwise the shader won't even look at the matrix/sampler
   */
  
  void SkBitmapProcState::platformProcs() {
      bool isOpaque = 256 == fAlphaScale;
      bool justDx = false;
  
      if (fInvType <= (SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask)) {
          justDx = true;
      }
  
      switch (fBitmap->colorType()) {
          case kIndex_8_SkColorType:
              if (justDx && SkPaint::kNone_FilterLevel == fFilterLevel) {
                  fSampleProc16 = SI8_D16_nofilter_DX_mips_dsp;
                  fShaderProc16 = NULL;
                  if (isOpaque) {
                      fSampleProc32 = SI8_opaque_D32_nofilter_DX_mips_dsp;
                      fShaderProc32 = NULL;
                  }
              }
              break;
          default:
              break;
      }
  }
  
  void SkBitmapScaler::PlatformConvolutionProcs(SkConvolutionProcs*) {}
  