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Diffstat (limited to 'chromium/cc/raster/texture_compressor_etc1.h')
| -rw-r--r-- | chromium/cc/raster/texture_compressor_etc1.h | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/chromium/cc/raster/texture_compressor_etc1.h b/chromium/cc/raster/texture_compressor_etc1.h deleted file mode 100644 index 6e85313cab0..00000000000 --- a/chromium/cc/raster/texture_compressor_etc1.h +++ /dev/null @@ -1,204 +0,0 @@ -// 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_RASTER_TEXTURE_COMPRESSOR_ETC1_H_ -#define CC_RASTER_TEXTURE_COMPRESSOR_ETC1_H_ - -#include "cc/raster/texture_compressor.h" - -#include <stdint.h> - -#include "base/compiler_specific.h" -#include "base/logging.h" -#include "base/macros.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_RASTER_TEXTURE_COMPRESSOR_ETC1_H_ |