Revert of Add ETC1 powered SSE encoder for tile texture compression

cc/resources/texture_compressor_etc1.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_RESOURCES_TEXTURE_COMPRESSOR_ETC1_H_
 #define CC_RESOURCES_TEXTURE_COMPRESSOR_ETC1_H_
 
 #include "cc/resources/texture_compressor.h"
 
-#include "base/compiler_specific.h"
-#include "base/logging.h"
-
 namespace cc {
 
-template <typename T>
-inline T clamp(T val, T min, T max) {
-  return val < min ? min : (val > max ? max : val);
-}
-
-inline uint8_t round_to_5_bits(float val) {
-  return clamp<uint8_t>(val * 31.0f / 255.0f + 0.5f, 0, 31);
-}
-
-inline uint8_t round_to_4_bits(float val) {
-  return clamp<uint8_t>(val * 15.0f / 255.0f + 0.5f, 0, 15);
-}
-
-union Color {
-  struct BgraColorType {
-    uint8_t b;
-    uint8_t g;
-    uint8_t r;
-    uint8_t a;
-  } channels;
-  uint8_t components[4];
-  uint32_t bits;
-};
-
-// Codeword tables.
-// See: Table 3.17.2
-ALIGNAS(16) static const int16_t g_codeword_tables[8][4] = {
-    {-8, -2, 2, 8},
-    {-17, -5, 5, 17},
-    {-29, -9, 9, 29},
-    {-42, -13, 13, 42},
-    {-60, -18, 18, 60},
-    {-80, -24, 24, 80},
-    {-106, -33, 33, 106},
-    {-183, -47, 47, 183}};
-
-// Maps modifier indices to pixel index values.
-// See: Table 3.17.3
-static const uint8_t g_mod_to_pix[4] = {3, 2, 0, 1};
-
-// The ETC1 specification index texels as follows:
-// [a][e][i][m]     [ 0][ 4][ 8][12]
-// [b][f][j][n] <-> [ 1][ 5][ 9][13]
-// [c][g][k][o]     [ 2][ 6][10][14]
-// [d][h][l][p]     [ 3][ 7][11][15]
-
-// [ 0][ 1][ 2][ 3]     [ 0][ 1][ 4][ 5]
-// [ 4][ 5][ 6][ 7] <-> [ 8][ 9][12][13]
-// [ 8][ 9][10][11]     [ 2][ 3][ 6][ 7]
-// [12][13][14][15]     [10][11][14][15]
-
-// However, when extracting sub blocks from BGRA data the natural array
-// indexing order ends up different:
-// vertical0: [a][e][b][f]  horizontal0: [a][e][i][m]
-//            [c][g][d][h]               [b][f][j][n]
-// vertical1: [i][m][j][n]  horizontal1: [c][g][k][o]
-//            [k][o][l][p]               [d][h][l][p]
-
-// In order to translate from the natural array indices in a sub block to the
-// indices (number) used by specification and hardware we use this table.
-static const uint8_t g_idx_to_num[4][8] = {
-    {0, 4, 1, 5, 2, 6, 3, 7},        // Vertical block 0.
-    {8, 12, 9, 13, 10, 14, 11, 15},  // Vertical block 1.
-    {0, 4, 8, 12, 1, 5, 9, 13},      // Horizontal block 0.
-    {2, 6, 10, 14, 3, 7, 11, 15}     // Horizontal block 1.
-};
-
-inline void WriteColors444(uint8_t* block,
-                           const Color& color0,
-                           const Color& color1) {
-  // Write output color for BGRA textures.
-  block[0] = (color0.channels.r & 0xf0) | (color1.channels.r >> 4);
-  block[1] = (color0.channels.g & 0xf0) | (color1.channels.g >> 4);
-  block[2] = (color0.channels.b & 0xf0) | (color1.channels.b >> 4);
-}
-
-inline void WriteColors555(uint8_t* block,
-                           const Color& color0,
-                           const Color& color1) {
-  // Table for conversion to 3-bit two complement format.
-  static const uint8_t two_compl_trans_table[8] = {
-      4,  // -4 (100b)
-      5,  // -3 (101b)
-      6,  // -2 (110b)
-      7,  // -1 (111b)
-      0,  //  0 (000b)
-      1,  //  1 (001b)
-      2,  //  2 (010b)
-      3,  //  3 (011b)
-  };
-
-  int16_t delta_r =
-      static_cast<int16_t>(color1.channels.r >> 3) - (color0.channels.r >> 3);
-  int16_t delta_g =
-      static_cast<int16_t>(color1.channels.g >> 3) - (color0.channels.g >> 3);
-  int16_t delta_b =
-      static_cast<int16_t>(color1.channels.b >> 3) - (color0.channels.b >> 3);
-  DCHECK_GE(delta_r, -4);
-  DCHECK_LE(delta_r, 3);
-  DCHECK_GE(delta_g, -4);
-  DCHECK_LE(delta_g, 3);
-  DCHECK_GE(delta_b, -4);
-  DCHECK_LE(delta_b, 3);
-
-  // Write output color for BGRA textures.
-  block[0] = (color0.channels.r & 0xf8) | two_compl_trans_table[delta_r + 4];
-  block[1] = (color0.channels.g & 0xf8) | two_compl_trans_table[delta_g + 4];
-  block[2] = (color0.channels.b & 0xf8) | two_compl_trans_table[delta_b + 4];
-}
-
-inline void WriteCodewordTable(uint8_t* block,
-                               uint8_t sub_block_id,
-                               uint8_t table) {
-  DCHECK_LT(sub_block_id, 2);
-  DCHECK_LT(table, 8);
-
-  uint8_t shift = (2 + (3 - sub_block_id * 3));
-  block[3] &= ~(0x07 << shift);
-  block[3] |= table << shift;
-}
-
-inline void WritePixelData(uint8_t* block, uint32_t pixel_data) {
-  block[4] |= pixel_data >> 24;
-  block[5] |= (pixel_data >> 16) & 0xff;
-  block[6] |= (pixel_data >> 8) & 0xff;
-  block[7] |= pixel_data & 0xff;
-}
-
-inline void WriteFlip(uint8_t* block, bool flip) {
-  block[3] &= ~0x01;
-  block[3] |= static_cast<uint8_t>(flip);
-}
-
-inline void WriteDiff(uint8_t* block, bool diff) {
-  block[3] &= ~0x02;
-  block[3] |= static_cast<uint8_t>(diff) << 1;
-}
-
-// Compress and rounds BGR888 into BGR444. The resulting BGR444 color is
-// expanded to BGR888 as it would be in hardware after decompression. The
-// actual 444-bit data is available in the four most significant bits of each
-// channel.
-inline Color MakeColor444(const float* bgr) {
-  uint8_t b4 = round_to_4_bits(bgr[0]);
-  uint8_t g4 = round_to_4_bits(bgr[1]);
-  uint8_t r4 = round_to_4_bits(bgr[2]);
-  Color bgr444;
-  bgr444.channels.b = (b4 << 4) | b4;
-  bgr444.channels.g = (g4 << 4) | g4;
-  bgr444.channels.r = (r4 << 4) | r4;
-  // Added to distinguish between expanded 555 and 444 colors.
-  bgr444.channels.a = 0x44;
-  return bgr444;
-}
-
-// Compress and rounds BGR888 into BGR555. The resulting BGR555 color is
-// expanded to BGR888 as it would be in hardware after decompression. The
-// actual 555-bit data is available in the five most significant bits of each
-// channel.
-inline Color MakeColor555(const float* bgr) {
-  uint8_t b5 = round_to_5_bits(bgr[0]);
-  uint8_t g5 = round_to_5_bits(bgr[1]);
-  uint8_t r5 = round_to_5_bits(bgr[2]);
-  Color bgr555;
-  bgr555.channels.b = (b5 << 3) | (b5 >> 2);
-  bgr555.channels.g = (g5 << 3) | (g5 >> 2);
-  bgr555.channels.r = (r5 << 3) | (r5 >> 2);
-  // Added to distinguish between expanded 555 and 444 colors.
-  bgr555.channels.a = 0x55;
-  return bgr555;
-}
-
 class CC_EXPORT TextureCompressorETC1 : public TextureCompressor {
  public:
   TextureCompressorETC1() {}
 
   // Compress a texture using ETC1. Note that the |quality| parameter is
   // ignored. The current implementation does not support different quality
   // settings.
   void Compress(const uint8_t* src,
                 uint8_t* dst,
                 int width,
                 int height,
                 Quality quality) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TextureCompressorETC1);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TEXTURE_COMPRESSOR_ETC1_H_