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+/*
+ * This file is subject to the terms of the GFX License. If a copy of
+ * the license was not distributed with this file, you can obtain one at:
+ *
+ * http://ugfx.org/license.html
+ */
+
+/**
+ * @file include/gdisp/colors.h
+ * @brief GDISP color definitions header file.
+ *
+ * @defgroup Colors Colors
+ * @ingroup GDISP
+ * @{
+ */
+
+#ifndef _GDISP_COLORS_H
+#define _GDISP_COLORS_H
+
+#include "gfx.h"
+
+#if GFX_USE_GDISP || defined(__DOXYGEN__)
+
+/**
+ * For pixel formats we do some assignment of codes to enable
+ * format auto-calculation. (Undocumented).
+ * 0x2RGB TRUECOLOR RGB format, R = red bits, G = green bits, B = blue bits
+ * 0x3RGB TRUECOLOR BGR format, R = red bits, G = green bits, B = blue bits
+ * 0x40XX GRAYSCALE XX = bits
+ * 0x60XX PALLETTE XX = bits
+ * 0x8XXX CUSTOM format.
+ */
+#define GDISP_COLORSYSTEM_MASK 0xF000
+#define GDISP_COLORSYSTEM_RGB 0x2000
+#define GDISP_COLORSYSTEM_BGR 0x3000
+
+/**
+ * @brief Color Type Constants
+ * @{
+ */
+#define GDISP_COLORSYSTEM_TRUECOLOR 0x2000
+#define GDISP_COLORSYSTEM_GRAYSCALE 0x4000
+#define GDISP_COLORSYSTEM_PALETTE 0x6000
+/** @} */
+
+/**
+ * @brief Pixel Format Constants
+ * @{
+ */
+#define GDISP_PIXELFORMAT_MONO (GDISP_COLORSYSTEM_GRAYSCALE|0x0001)
+#define GDISP_PIXELFORMAT_GRAY4 (GDISP_COLORSYSTEM_GRAYSCALE|0x0002)
+#define GDISP_PIXELFORMAT_GRAY16 (GDISP_COLORSYSTEM_GRAYSCALE|0x0004)
+#define GDISP_PIXELFORMAT_GRAY256 (GDISP_COLORSYSTEM_GRAYSCALE|0x0008)
+#define GDISP_PIXELFORMAT_RGB565 (GDISP_COLORSYSTEM_RGB|0x0565)
+#define GDISP_PIXELFORMAT_BGR565 (GDISP_COLORSYSTEM_BGR|0x0565)
+#define GDISP_PIXELFORMAT_RGB888 (GDISP_COLORSYSTEM_RGB|0x0888)
+#define GDISP_PIXELFORMAT_BGR888 (GDISP_COLORSYSTEM_BGR|0x0888)
+#define GDISP_PIXELFORMAT_RGB444 (GDISP_COLORSYSTEM_RGB|0x0444)
+#define GDISP_PIXELFORMAT_BGR444 (GDISP_COLORSYSTEM_BGR|0x0444)
+#define GDISP_PIXELFORMAT_RGB332 (GDISP_COLORSYSTEM_RGB|0x0332)
+#define GDISP_PIXELFORMAT_BGR332 (GDISP_COLORSYSTEM_BGR|0x0332)
+#define GDISP_PIXELFORMAT_RGB666 (GDISP_COLORSYSTEM_RGB|0x0666)
+#define GDISP_PIXELFORMAT_BGR666 (GDISP_COLORSYSTEM_BGR|0x0666)
+#define GDISP_PIXELFORMAT_ERROR 0x0000
+/** @} */
+
+/**
+ * @name Some basic colors
+ * @{
+ */
+#define White HTML2COLOR(0xFFFFFF)
+#define Black HTML2COLOR(0x000000)
+#define Gray HTML2COLOR(0x808080)
+#define Grey Gray
+#define Blue HTML2COLOR(0x0000FF)
+#define Red HTML2COLOR(0xFF0000)
+#define Fuchsia HTML2COLOR(0xFF00FF)
+#define Magenta Fuchsia
+#define Green HTML2COLOR(0x008000)
+#define Yellow HTML2COLOR(0xFFFF00)
+#define Aqua HTML2COLOR(0x00FFFF)
+#define Cyan Aqua
+#define Lime HTML2COLOR(0x00FF00)
+#define Maroon HTML2COLOR(0x800000)
+#define Navy HTML2COLOR(0x000080)
+#define Olive HTML2COLOR(0x808000)
+#define Purple HTML2COLOR(0x800080)
+#define Silver HTML2COLOR(0xC0C0C0)
+#define Teal HTML2COLOR(0x008080)
+#define Orange HTML2COLOR(0xFFA500)
+#define Pink HTML2COLOR(0xFFC0CB)
+#define SkyBlue HTML2COLOR(0x87CEEB)
+/** @} */
+
+#if defined(__DOXYGEN__)
+ /**
+ * @brief The color system (grayscale, palette or truecolor)
+ */
+ #define COLOR_SYSTEM GDISP_COLORSYSTEM_TRUECOLOR
+ /**
+ * @brief The number of bits in a color value
+ */
+ #define COLOR_BITS 16
+ /**
+ * @brief The number of bits for each of red, green and blue
+ * @{
+ */
+ #define COLOR_BITS_R 5
+ #define COLOR_BITS_G 6
+ #define COLOR_BITS_B 5
+ /** @} */
+ /**
+ * @brief The number of bits to shift each of red, green and blue to put it in the correct place in the color
+ * @{
+ */
+ #define COLOR_SHIFT_R 11
+ #define COLOR_SHIFT_G 5
+ #define COLOR_SHIFT_B 0
+ /** @} */
+ /**
+ * @brief Does the color need masking to remove invalid bits
+ */
+ #define COLOR_NEEDS_MASK FALSE
+ /**
+ * @brief If the color needs masking to remove invalid bits, this is the mask
+ */
+ #define COLOR_MASK 0xFFFF
+ /**
+ * @brief The color type
+ * @{
+ */
+ #define COLOR_TYPE uint16_t
+ /** @} */
+ /**
+ * @brief The number of bits in the color type (not necessarily the same as COLOR_BITS).
+ */
+ #define COLOR_TYPE_BITS 16
+ /**
+ * @brief Convert a luminance (0 to 255) into a color value.
+ * @note The word "Luma" is used instead of grey or gray due to the spelling ambiguities of the word grey
+ * @note This is not a weighted luminance conversion in the color tv style.
+ * @note @p LUMA2COLOR() uses a linear conversion (0.33R + 0.33G + 0.33B). Note this is different to color
+ * tv luminance (0.26126R + 0.7152G + 0.0722B), digital tv luminance of (0.299R + 0.587G + 0.114B), or
+ * @p LUMA_OF() which uses (0.25R + 0.5G + 0.25B).
+ */
+ #define LUMA2COLOR(l) ((color_t)((((l) & 0xF8)<<8) | (((l) & 0xFC)<<3) | (((l) & 0xF8)>>3)))
+ /**
+ * @brief Convert red, green, blue (each 0 to 255) into a color value.
+ */
+ #define RGB2COLOR(r,g,b) ((color_t)((((r) & 0xF8)<<8) | (((g) & 0xFC)<<3) | (((b) & 0xF8)>>3)))
+ /**
+ * @brief Convert a 6 digit HTML code (hex) into a color value.
+ */
+ #define HTML2COLOR(h) ((color_t)((((h) & 0xF80000)>>8) | (((h) & 0x00FC00)>>5) | (((h) & 0x0000F8)>>3)))
+ /**
+ * @brief Extract the luma/red/green/blue component (0 to 255) of a color value.
+ * @note This uses quick and dirty bit shifting. If you want more exact colors
+ * use @p EXACT_RED_OF() etc which uses multiplies and divides. For constant
+ * colors using @p EXACT_RED_OF() is no more expensive because the compiler
+ * evaluates the arithmetic.
+ * @note @p LUMA_OF() returns a roughly weighted luminance (0.25R + 0.5G + 0.25B). Note this is
+ * different to @p LUMA2COLOR() which uses a linear conversion (0.33R + 0.33G + 0.33B) and
+ * color tv luminance of (0.26126R + 0.7152G + 0.0722B) and digital tv luminance of (0.299R + 0.587G + 0.114B).
+ * @note A 5 bit color component maximum value (0x1F) converts to 0xF8 (slightly off-color)
+ * @{
+ */
+ #define LUMA_OF(c) ((RED_OF(c)+((uint16_t)GREEN_OF(c)<<1)+BLUE_OF(c))>>2)
+ #define RED_OF(c) (((c) & 0xF800)>>8)
+ #define GREEN_OF(c) (((c)&0x007E)>>3)
+ #define BLUE_OF(c) (((c)&0x001F)<<3)
+ /** @} */
+ /**
+ * @brief Extract the exact luma/red/green/blue component (0 to 255) of a color value.
+ * @note This uses multiplies and divides rather than bit shifting.
+ * This gives exact equivalent colors at the expense of more cpu intensive
+ * operations. Note for constants this is no more expensive than @p REF_OF()
+ * because the compiler evaluates the arithmetic.
+ * @note @p EXACT_LUMA_OF() returns a roughly weighted luminance (0.25R + 0.5G + 0.25B). Note this is
+ * different to @p LUMA2COLOR() which uses a linear conversion (0.33R + 0.33G + 0.33B) and
+ * color tv luminance of (0.26126R + 0.7152G + 0.0722B) and digital tv luminance of (0.299R + 0.587G + 0.114B).
+ * @note A 5 bit color component maximum value (0x1F) converts to 0xFF (the true equivalent color)
+ * @{
+ */
+ #define EXACT_LUMA_OF(c) ((EXACT_RED_OF(c)+((uint16_t)EXACT_GREEN_OF(c)<<1)+EXACT_BLUE_OF(c))>>2)
+ #define EXACT_RED_OF(c) (((((c)>>11)&0x1F)*255)/31)
+ #define EXACT_GREEN_OF(c) (((((c)>>5)&0x3F)*255)/63)
+ #define EXACT_BLUE_OF(c) (((((c)>>0)&0x1F)*255)/31)
+ /** @} */
+#endif
+
+/*
+ * We use this big mess of macros to calculate all the components
+ * to prevent user errors in the color definitions. It greatly simplifies
+ * the above definitions and ensures a consistent implementation.
+ */
+
+//-------------------------
+// True-Color color system
+//-------------------------
+#if GDISP_PIXELFORMAT & GDISP_COLORSYSTEM_TRUECOLOR
+ #define COLOR_SYSTEM GDISP_COLORSYSTEM_TRUECOLOR
+
+ // Calculate the number of bits
+ #define COLOR_BITS_R ((GDISP_PIXELFORMAT>>8) & 0x0F)
+ #define COLOR_BITS_G ((GDISP_PIXELFORMAT>>4) & 0x0F)
+ #define COLOR_BITS_B ((GDISP_PIXELFORMAT>>0) & 0x0F)
+ #define COLOR_BITS (COLOR_BITS_R + COLOR_BITS_G + COLOR_BITS_B)
+
+ // From the number of bits determine COLOR_TYPE, COLOR_TYPE_BITS and masking
+ #if COLOR_BITS <= 8
+ #define COLOR_TYPE uint8_t
+ #define COLOR_TYPE_BITS 8
+ #elif COLOR_BITS <= 16
+ #define COLOR_TYPE uint16_t
+ #define COLOR_TYPE_BITS 16
+ #elif COLOR_BITS <= 32
+ #define COLOR_TYPE uint32_t
+ #define COLOR_TYPE_BITS 32
+ #else
+ #error "GDISP: Cannot define color types with more than 32 bits"
+ #endif
+ #if COLOR_TYPE_BITS == COLOR_BITS
+ #define COLOR_NEEDS_MASK FALSE
+ #else
+ #define COLOR_NEEDS_MASK TRUE
+ #endif
+ #define COLOR_MASK() ((1 << COLOR_BITS)-1)
+
+ // Calculate the component bit shifts
+ #if (GDISP_PIXELFORMAT & GDISP_COLORSYSTEM_MASK) == GDISP_COLORSYSTEM_RGB
+ #define COLOR_SHIFT_R (COLOR_BITS_B+COLOR_BITS_G)
+ #define COLOR_SHIFT_G COLOR_BITS_B
+ #define COLOR_SHIFT_B 0
+ #else
+ #define COLOR_SHIFT_B (COLOR_BITS_R+COLOR_BITS_G)
+ #define COLOR_SHIFT_G COLOR_BITS_R
+ #define COLOR_SHIFT_R 0
+ #endif
+
+ // Calculate RED_OF, GREEN_OF, BLUE_OF and RGB2COLOR
+ #if COLOR_BITS_R + COLOR_SHIFT_R == 8
+ #define RED_OF(c) ((c) & (((1<<COLOR_BITS_R)-1) << COLOR_SHIFT_R))
+ #define RGB2COLOR_R(r) ((COLOR_TYPE)((r) & (0xFF & ~((1<<(8-COLOR_BITS_R))-1))))
+ #elif COLOR_BITS_R + COLOR_SHIFT_R > 8
+ #define RED_OF(c) (((c) & (((1<<COLOR_BITS_R)-1) << COLOR_SHIFT_R)) >> (COLOR_BITS_R+COLOR_SHIFT_R-8))
+ #define RGB2COLOR_R(r) (((COLOR_TYPE)((r) & (0xFF & ~((1<<(8-COLOR_BITS_R))-1)))) << (COLOR_BITS_R+COLOR_SHIFT_R-8))
+ #else // COLOR_BITS_R + COLOR_SHIFT_R < 8
+ #define RED_OF(c) (((c) & (((1<<COLOR_BITS_R)-1) << COLOR_SHIFT_R)) << (8-(COLOR_BITS_R+COLOR_SHIFT_R)))
+ #define RGB2COLOR_R(r) (((COLOR_TYPE)((r) & (0xFF & ~((1<<(8-COLOR_BITS_R))-1)))) >> (8-(COLOR_BITS_R+COLOR_SHIFT_R)))
+ #endif
+ #if COLOR_BITS_G + COLOR_SHIFT_G == 8
+ #define GREEN_OF(c) ((c) & (((1<<COLOR_BITS_G)-1) << COLOR_SHIFT_G))
+ #define RGB2COLOR_G(g) ((COLOR_TYPE)((g) & (0xFF & ~((1<<(8-COLOR_BITS_G))-1))))
+ #elif COLOR_BITS_G + COLOR_SHIFT_G > 8
+ #define GREEN_OF(c) (((c) & (((1<<COLOR_BITS_G)-1) << COLOR_SHIFT_G)) >> (COLOR_BITS_G+COLOR_SHIFT_G-8))
+ #define RGB2COLOR_G(g) (((COLOR_TYPE)((g) & (0xFF & ~((1<<(8-COLOR_BITS_G))-1)))) << (COLOR_BITS_G+COLOR_SHIFT_G-8))
+ #else // COLOR_BITS_G + COLOR_SHIFT_G < 8
+ #define GREEN_OF(c) (((c) & (((1<<COLOR_BITS_G)-1) << COLOR_SHIFT_G)) << (8-(COLOR_BITS_G+COLOR_SHIFT_G)))
+ #define RGB2COLOR_G(g) (((COLOR_TYPE)((g) & (0xFF & ~((1<<(8-COLOR_BITS_G))-1)))) >> (8-(COLOR_BITS_G+COLOR_SHIFT_G)))
+ #endif
+ #if COLOR_BITS_B + COLOR_SHIFT_B == 8
+ #define BLUE_OF(c) ((c) & (((1<<COLOR_BITS_B)-1) << COLOR_SHIFT_B))
+ #define RGB2COLOR_B(b) ((COLOR_TYPE)((b) & (0xFF & ~((1<<(8-COLOR_BITS_B))-1))))
+ #elif COLOR_BITS_B + COLOR_SHIFT_B > 8
+ #define BLUE_OF(c) (((c) & (((1<<COLOR_BITS_B)-1) << COLOR_SHIFT_B)) >> (COLOR_BITS_B+COLOR_SHIFT_B-8))
+ #define RGB2COLOR_B(b) (((COLOR_TYPE)((b) & (0xFF & ~((1<<(8-COLOR_BITS_B))-1)))) << (COLOR_BITS_B+COLOR_SHIFT_B-8))
+ #else // COLOR_BITS_B + COLOR_SHIFT_B < 8
+ #define BLUE_OF(c) (((c) & (((1<<COLOR_BITS_B)-1) << COLOR_SHIFT_B)) << (8-(COLOR_BITS_B+COLOR_SHIFT_B)))
+ #define RGB2COLOR_B(b) (((COLOR_TYPE)((b) & (0xFF & ~((1<<(8-COLOR_BITS_B))-1)))) >> (8-(COLOR_BITS_B+COLOR_SHIFT_B)))
+ #endif
+ #define LUMA_OF(c) ((RED_OF(c)+((uint16_t)GREEN_OF(c)<<1)+BLUE_OF(c))>>2)
+ #define EXACT_RED_OF(c) (((uint16_t)(((c)>>COLOR_SHIFT_R)&((1<<COLOR_BITS_R)-1))*255)/((1<<COLOR_BITS_R)-1))
+ #define EXACT_GREEN_OF(c) (((uint16_t)(((c)>>COLOR_SHIFT_G)&((1<<COLOR_BITS_G)-1))*255)/((1<<COLOR_BITS_G)-1))
+ #define EXACT_BLUE_OF(c) (((uint16_t)(((c)>>COLOR_SHIFT_B)&((1<<COLOR_BITS_B)-1))*255)/((1<<COLOR_BITS_B)-1))
+ #define EXACT_LUMA_OF(c) ((EXACT_RED_OF(c)+((uint16_t)EXACT_GREEN_OF(c)<<1)+EXACT_BLUE_OF(c))>>2)
+ #define LUMA2COLOR(l) (RGB2COLOR_R(l) | RGB2COLOR_G(l) | RGB2COLOR_B(l))
+ #define RGB2COLOR(r,g,b) (RGB2COLOR_R(r) | RGB2COLOR_G(g) | RGB2COLOR_B(b))
+
+ // Calculate HTML2COLOR
+ #if COLOR_BITS_R + COLOR_SHIFT_R == 24
+ #define HTML2COLOR_R(h) ((h) & ((0xFF & ~((1<<(8-COLOR_BITS_R))-1))<<16))
+ #elif COLOR_BITS_R + COLOR_SHIFT_R > 24
+ #define HTML2COLOR_R(h) (((h) & ((0xFF & ~((1<<(8-COLOR_BITS_R))-1))<<16)) << (COLOR_BITS_R+COLOR_SHIFT_R-24))
+ #else // COLOR_BITS_R + COLOR_SHIFT_R < 24
+ #define HTML2COLOR_R(h) (((h) & ((0xFF & ~((1<<(8-COLOR_BITS_R))-1))<<16)) >> (24-(COLOR_BITS_R+COLOR_SHIFT_R)))
+ #endif
+ #if COLOR_BITS_G + COLOR_SHIFT_G == 16
+ #define HTML2COLOR_G(h) ((h) & ((0xFF & ~((1<<(8-COLOR_BITS_G))-1))<<8))
+ #elif COLOR_BITS_G + COLOR_SHIFT_G > 16
+ #define HTML2COLOR_G(h) (((h) & ((0xFF & ~((1<<(8-COLOR_BITS_G))-1))<<8)) << (COLOR_BITS_G+COLOR_SHIFT_G-16))
+ #else // COLOR_BITS_G + COLOR_SHIFT_G < 16
+ #define HTML2COLOR_G(h) (((h) & ((0xFF & ~((1<<(8-COLOR_BITS_G))-1))<<8)) >> (16-(COLOR_BITS_G+COLOR_SHIFT_G)))
+ #endif
+ #if COLOR_BITS_B + COLOR_SHIFT_B == 8
+ #define HTML2COLOR_B(h) ((h) & (0xFF & ~((1<<(8-COLOR_BITS_B))-1)))
+ #elif COLOR_BITS_B + COLOR_SHIFT_B > 8
+ #define HTML2COLOR_B(h) (((h) & (0xFF & ~((1<<(8-COLOR_BITS_B))-1))) << (COLOR_BITS_B+COLOR_SHIFT_B-8))
+ #else // COLOR_BITS_B + COLOR_SHIFT_B < 8
+ #define HTML2COLOR_B(h) (((h) & (0xFF & ~((1<<(8-COLOR_BITS_B))-1))) >> (8-(COLOR_BITS_B+COLOR_SHIFT_B)))
+ #endif
+ #define HTML2COLOR(h) ((COLOR_TYPE)(HTML2COLOR_R(h) | HTML2COLOR_G(h) | HTML2COLOR_B(h)))
+
+//-------------------------
+// Gray-scale color system
+//-------------------------
+#elif (GDISP_PIXELFORMAT & GDISP_COLORSYSTEM_MASK) == GDISP_COLORSYSTEM_GRAYSCALE
+ #define COLOR_SYSTEM GDISP_COLORSYSTEM_GRAYSCALE
+
+ // Calculate the number of bits and shifts
+ #define COLOR_BITS (GDISP_PIXELFORMAT & 0xFF)
+ #define COLOR_BITS_R COLOR_BITS
+ #define COLOR_BITS_G COLOR_BITS
+ #define COLOR_BITS_B COLOR_BITS
+ #define COLOR_SHIFT_R 0
+ #define COLOR_SHIFT_G 0
+ #define COLOR_SHIFT_B 0
+
+ // From the number of bits determine COLOR_TYPE, COLOR_TYPE_BITS and masking
+ #if COLOR_BITS <= 8
+ #define COLOR_TYPE uint8_t
+ #define COLOR_TYPE_BITS 8
+ #else
+ #error "GDISP: Cannot define gray-scale color types with more than 8 bits"
+ #endif
+ #if COLOR_TYPE_BITS == COLOR_BITS
+ #define COLOR_NEEDS_MASK FALSE
+ #else
+ #define COLOR_NEEDS_MASK TRUE
+ #endif
+ #define COLOR_MASK() ((1 << COLOR_BITS)-1)
+
+ #if COLOR_BITS == 1
+ #define RGB2COLOR(r,g,b) (((r)|(g)|(b)) ? 1 : 0)
+ #define LUMA2COLOR(l) ((l) ? 1 : 0)
+ #define HTML2COLOR(h) ((h) ? 1 : 0)
+ #define LUMA_OF(c) ((c) ? 255 : 0)
+ #define EXACT_LUMA_OF(c) LUMA_OF(c)
+ #else
+ // They eye is more sensitive to green
+ #define RGB2COLOR(r,g,b) ((COLOR_TYPE)(((uint16_t)(r)+(g)+(g)+(b)) >> (10-COLOR_BITS)))
+ #define LUMA2COLOR(l) ((COLOR_TYPE)((l)>>(8-COLOR_BITS)))
+ #define HTML2COLOR(h) ((COLOR_TYPE)(((((h)&0xFF0000)>>16)+(((h)&0x00FF00)>>7)+((h)&0x0000FF)) >> (10-COLOR_BITS)))
+ #define LUMA_OF(c) (((c) & ((1<<COLOR_BITS)-1)) << (8-COLOR_BITS))
+ #define EXACT_LUMA_OF(c) ((((uint16_t)(c) & ((1<<COLOR_BITS)-1))*255)/((1<<COLOR_BITS)-1))
+ #endif
+
+ #define RED_OF(c) LUMA_OF(c)
+ #define GREEN_OF(c) LUMA_OF(c)
+ #define BLUE_OF(c) LUMA_OF(c)
+ #define EXACT_RED_OF(c) EXACT_LUMA_OF(c)
+ #define EXACT_GREEN_OF(c) EXACT_LUMA_OF(c)
+ #define EXACT_BLUE_OF(c) EXACT_LUMA_OF(c)
+
+//-------------------------
+// Palette color system
+//-------------------------
+#elif (GDISP_PIXELFORMAT & GDISP_COLORSYSTEM_MASK) == GDISP_COLORSYSTEM_PALETTE
+ #define COLOR_SYSTEM GDISP_COLORSYSTEM_PALETTE
+
+ #error "GDISP: A palette color system is not currently supported"
+
+//-------------------------
+// Some other color system
+//-------------------------
+#else
+ #error "GDISP: Unsupported color system"
+#endif
+
+/**
+ * @brief The color type definition
+ */
+typedef COLOR_TYPE color_t;
+
+#endif /* GFX_USE_GDISP */
+
+#endif /* _GDISP_COLORS_H */
+/** @} */
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