109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
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/* Rgb2Hires
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* Copyright (C) 2016-2022 Christophe Meneboeuf <christophe@xtof.info>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __HIRES_H__
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#define __HIRES_H__
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#include <cstdint>
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#include <array>
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#include <vector>
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#include <string>
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#include <SDL2/SDL_image.h>
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namespace RgbToHires
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{
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struct ColorRgb : public SDL_Color
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{
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inline bool operator==(const ColorRgb& rhs) const
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{
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return r == rhs.r && g == rhs.g && b == rhs.b;
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}
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inline bool operator==(const SDL_Color& rhs) const
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{
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return r == rhs.r && g == rhs.g && b == rhs.b;
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}
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};
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// HIRES Palette
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constexpr ColorRgb WHITE{ 0xFF, 0xFF, 0xFF, 0xFF };
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constexpr ColorRgb BLACK{ 0x00, 0x00, 0x00, 0xFF };
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constexpr ColorRgb BLUE{ 0x07, 0xA8, 0xE0, 0xFF };
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constexpr ColorRgb GREEN{ 0x43, 0xC8, 0x00, 0xFF };
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constexpr ColorRgb ORANGE{ 0xF9, 0x56, 0x1D, 0xFF };
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constexpr ColorRgb VIOLET{ 0xBB, 0x36, 0xFF, 0xFF };
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constexpr unsigned WIDTH = 140u;
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constexpr unsigned HEIGHT = 192u;
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static constexpr unsigned NB_PIXEL_PER_BLOCK = 7u;
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static constexpr unsigned NB_BLOCK_PER_LINE = 20u;
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static constexpr unsigned NB_LINES_PER_SCREEN = 192u;
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constexpr std::array<const uint16_t, 192 / 8> LineAdresses = {
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0x0000, 0x0080, 0x0100, 0x0180, 0x0200, 0x0280, 0x0300, 0x0380,
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0x0028, 0x00a8, 0x0128, 0x01a8, 0x0228, 0x02a8, 0x0328, 0x03a8,
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0x0050, 0x00d0, 0x0150, 0x01d0, 0x0250, 0x02d0, 0x0350, 0x03d0
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}; ///< Base address of the interleaved lines
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constexpr std::array<const uint16_t, 8> LineOffsets = {
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0x0, 0x400, 0x800, 0xc00, 0x1000, 0x1400, 0x1800, 0x1c00
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}; ///< Offset to get the full address
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using BlockPixelRgb = std::array<ColorRgb, 7u>;
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/// @brief A block of 7 pixels
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class BlockHr
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{
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public:
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/// @brief Default constructor: all black
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BlockHr();
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/// @brief Construction from 7 pixels
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BlockHr(const BlockPixelRgb& );
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/// @brief returns the position of the first element
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inline std::array<uint8_t, 2>::const_iterator begin() const {
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return _data.begin();
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}
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/// @brief returns the position after the last element
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inline std::array<uint8_t, 2>::const_iterator end() const {
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return _data.end();
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}
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private:
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/// @brief color group as defined in Apple's documentation
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enum eColorGroup {
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GROUP_1,
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GROUP_2,
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UNDEF // black and white can be group1 or group2
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};
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/// @brief Returns the color group of these two 3.5 pixel blocks
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std::pair<eColorGroup, eColorGroup> getGroup(const BlockPixelRgb&) const;
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/// @brief Returns the bit pait corresponding to the given color
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uint8_t getDibit(const ColorRgb&) const;
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std::array<uint8_t, 2> _data;
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};
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}
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#endif |