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Diffstat (limited to 'src/vk/qoi.cpp')
| -rw-r--r-- | src/vk/qoi.cpp | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/src/vk/qoi.cpp b/src/vk/qoi.cpp deleted file mode 100644 index bc0caab..0000000 --- a/src/vk/qoi.cpp +++ /dev/null @@ -1,205 +0,0 @@ -/* - * Copyright 2022-2023 Frederico de Oliveira Linhares - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include "qoi.hpp" - -#include <array> -#include <fstream> - -#include "../binary_reader.hpp" - -namespace -{ - -const char MAGIC[]{"qoif"}; -const int HEADER_SIZE{14}; -const uint8_t PADDING[8]{0,0,0,0,0,0,0,1}; -const unsigned int PIXELS_MAX{400000000}; - -const int OP_INDEX{0b00000000}; -const int OP_DIFF {0b01000000}; -const int OP_LUMA {0b10000000}; -const int OP_RUN {0b11000000}; -const int OP_RGB {0b11111110}; -const int OP_RGBA {0b11111111}; - -const int MASK_2_BITS{0b11000000}; - -struct RGBA -{ - uint8_t red, green, blue, alpha; - - RGBA(); - RGBA(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha); -}; - -RGBA::RGBA(): - red{0}, - green{0}, - blue{0}, - alpha{0} -{ -} - -RGBA::RGBA(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha): - red{red}, - green{green}, - blue{blue}, - alpha{alpha} -{ -} - -struct Pixel -{ - union - { - RGBA colors; - uint32_t value; - }; - - Pixel(); - Pixel(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha); -}; - -Pixel::Pixel(): - colors{} -{ -} - -Pixel::Pixel(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha): - colors(red, green, blue, alpha) -{ -} - -inline int -color_hash(const RGBA &colors) -{ - return colors.red*3 + colors.green*5 + colors.blue*7 + colors.alpha*11; -} - -} - -namespace VK::QOI -{ - -Image::Image(const char *file_path, uint8_t channels): - channels{channels} -{ - if(this->channels != 0 && this->channels != 3 && this->channels != 4) - { - throw std::invalid_argument{"invalid number of channels"}; - } - - BinaryReader input{file_path}; - if(input.size() < HEADER_SIZE + (int)sizeof(PADDING)) - { - throw std::runtime_error{"invalid QOI file"}; - } - - input.read_chars(this->header.magic, 4); - this->header.width = input.read_ui32(); - this->header.height = input.read_ui32(); - this->header.channels = input.read_ui8(); - this->header.colorspace = input.read_ui8(); - - if(this->header.width == 0 || this->header.height == 0 || - this->header.channels < 3 || this->header.channels > 4 || - this->header.colorspace > 1 || - this->header.height >= PIXELS_MAX / this->header.width) - { - throw std::runtime_error{"QOI file have an invalid header"}; - } - - if(this->channels == 0) this->channels = this->header.channels; - - uint32_t num_pixels{this->header.width * this->header.height}; - this->pixels_len = num_pixels * this->channels; - this->pixels = new uint8_t[this->pixels_len]; - - std::array<Pixel, 64> index; - Pixel pixel(0, 0, 0, 255); - int chunks_len = input.size() - (int)sizeof(PADDING); - - /* - This algorithm is based on the original implementation that is in GitHub: - https://github.com/phoboslab/qoi - - For information about the QOI image format, see: https://qoiformat.org/ - */ - int pixel_p{0}; - int run{0}; - for(uint32_t decoded_pixel{0}; decoded_pixel < num_pixels; decoded_pixel++) - { - if(run > 0) - { - run--; - } - else if(input.pointer() < chunks_len) - { - int b1 = input.read_ui8(); - - if (b1 == OP_RGB) - { - pixel.colors.red = input.read_ui8(); - pixel.colors.green = input.read_ui8(); - pixel.colors.blue = input.read_ui8(); - } - else if (b1 == OP_RGBA) - { - pixel.colors.red = input.read_ui8(); - pixel.colors.green = input.read_ui8(); - pixel.colors.blue = input.read_ui8(); - pixel.colors.alpha = input.read_ui8(); - } - else if ((b1 & MASK_2_BITS) == OP_INDEX) - { - pixel = index[b1]; - } - else if ((b1 & MASK_2_BITS) == OP_DIFF) - { - pixel.colors.red += ((b1 >> 4) & 0x03) - 2; - pixel.colors.green += ((b1 >> 2) & 0x03) - 2; - pixel.colors.blue += (b1 & 0x03) - 2; - } - else if ((b1 & MASK_2_BITS) == OP_LUMA) - { - int b2 = input.read_ui8(); - int vg = (b1 & 0x3f) - 32; - pixel.colors.red += vg - 8 + ((b2 >> 4) & 0x0f); - pixel.colors.green += vg; - pixel.colors.blue += vg - 8 + (b2 & 0x0f); - } - else if ((b1 & MASK_2_BITS) == OP_RUN) - { - run = (b1 & 0x3f); - } - - index[color_hash(pixel.colors) % 64] = pixel; - } - - this->pixels[pixel_p++] = pixel.colors.red; - this->pixels[pixel_p++] = pixel.colors.green; - this->pixels[pixel_p++] = pixel.colors.blue; - if(this->channels == 4) this->pixels[pixel_p++] = pixel.colors.alpha; - } -} - -Image::~Image() -{ - delete[] this->pixels; -} - -} |