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GraphicOps.h
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//----------------------------------------------------------------------------------------------------------------------
// Extended graphics routines
// Copyright (c) 2024 Samuel Gomes
//----------------------------------------------------------------------------------------------------------------------
#pragma once
// #define TOOLBOX64_DEBUG 1
#include "Debug.h"
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <unordered_map>
#ifndef INC_COMMON_CPP
// This stuff is from QB64-PE common.h and is only here for debugging purposes
struct img_struct
{
void *lock_offset;
int64_t lock_id;
uint8_t valid; // 0,1 0=invalid
uint8_t text; // if set, surface is a text surface
uint8_t console; // dummy surface to absorb unimplemented console functionality
uint16_t width, height;
uint8_t bytes_per_pixel; // 1,2,4
uint8_t bits_per_pixel; // 1,2,4,8,16(text),32
uint32_t mask; // 1,3,0xF,0xFF,0xFFFF,0xFFFFFFFF
uint16_t compatible_mode; // 0,1,2,7,8,9,10,11,12,13,32,256
uint32_t color, background_color, draw_color;
uint32_t font; // 8,14,16,?
int16_t top_row, bottom_row; // VIEW PRINT settings, unique (as in QB) to each "page"
int16_t cursor_x, cursor_y; // unique (as in QB) to each "page"
uint8_t cursor_show, cursor_firstvalue, cursor_lastvalue;
union
{
uint8_t *offset;
uint32_t *offset32;
};
uint32_t flags;
uint32_t *pal;
int32_t transparent_color; //-1 means no color is transparent
uint8_t alpha_disabled;
uint8_t holding_cursor;
uint8_t print_mode;
// BEGIN apm ('active page migration')
// everything between apm points is migrated during active page changes
// note: apm data is only relevant to graphics modes
uint8_t apm_p1;
int32_t view_x1, view_y1, view_x2, view_y2;
int32_t view_offset_x, view_offset_y;
float x, y;
uint8_t clipping_or_scaling;
float scaling_x, scaling_y, scaling_offset_x, scaling_offset_y;
float window_x1, window_y1, window_x2, window_y2;
double draw_ta;
double draw_scale;
uint8_t apm_p2;
// END apm
};
extern uint8_t image_get_bgra_red(uint32_t c);
extern uint8_t image_get_bgra_green(uint32_t c);
extern uint8_t image_get_bgra_blue(uint32_t c);
extern uint8_t image_get_bgra_alpha(uint32_t c);
extern uint32_t image_get_bgra_bgr(uint32_t c);
extern uint32_t image_set_bgra_alpha(uint32_t c, uint8_t a = 0xFFu);
extern uint32_t image_make_bgra(uint8_t r, uint8_t g, uint8_t b, uint8_t a = 0xFFu);
extern uint32_t image_swap_red_blue(uint32_t clr);
extern uint8_t image_clamp_color_component(int n);
extern float image_calculate_rgb_distance(uint8_t r1, uint8_t g1, uint8_t b1, uint8_t r2, uint8_t g2, uint8_t b2);
extern uint32_t image_get_color_delta(uint8_t r1, uint8_t g1, uint8_t b1, uint8_t r2, uint8_t g2, uint8_t b2);
extern uint32_t func__rgb32(int32_t r, int32_t g, int32_t b, int32_t a);
extern uint32_t func__rgb32(int32_t r, int32_t g, int32_t b);
extern uint32_t func__rgb32(int32_t i, int32_t a);
extern uint32_t func__rgb32(int32_t i);
extern uint32_t func__rgba32(int32_t r, int32_t g, int32_t b, int32_t a);
extern int32_t func__alpha32(uint32_t col);
extern int32_t func__red32(uint32_t col);
extern int32_t func__green32(uint32_t col);
extern int32_t func__blue32(uint32_t col);
#else
struct img_struct;
#endif
// These are QB64-PE internal structures
extern img_struct *write_page;
extern img_struct *img;
extern const int32_t *page;
extern const int32_t nextimg;
extern const uint8_t charset8x8[256][8][8];
extern const uint8_t charset8x16[256][16][8];
// These are QB64-PE internal functions
extern void pset_and_clip(int32_t x, int32_t y, uint32_t color);
extern void fast_boxfill(int32_t x1, int32_t y1, int32_t x2, int32_t y2, uint32_t color);
extern void validatepage(int32_t n);
/// @brief This is a function pointer type that we'll use to plot "pixels" on graphics as well and "text" surfaces
typedef void (*Graphics_SetPixelFunction_)(int32_t x, int32_t y, uint32_t clrAtr);
/// @brief We'll use this internally so that we do not have the overhead of calling _Graphics_SetSetPixelFunction() for every pixel
Graphics_SetPixelFunction_ Graphics_SetPixel_ = nullptr;
/// @brief Internal function for plotting an antialiased pixel (using Xiaolin Wu's algorithm) on a 32-bit graphic surface. This will clip out-of-bounds pixels.
/// @param wx The x position.
/// @param wy The y position.
/// @param clrAtr A 32-bit RGBA color.
inline void Graphics_SetPixelAA_(float wx, float wy, uint32_t clrAtr)
{
auto x = int(wx);
auto y = int(wy);
auto fx = wx - x;
auto fy = wy - y;
auto invFx = 1.0f - fx;
auto invFy = 1.0f - fy;
auto a = image_get_bgra_alpha(clrAtr);
pset_and_clip(x, y, image_set_bgra_alpha(clrAtr, uint8_t(invFx * invFy * a)));
pset_and_clip(x + 1, y, image_set_bgra_alpha(clrAtr, uint8_t(fx * invFy * a)));
pset_and_clip(x, y + 1, image_set_bgra_alpha(clrAtr, uint8_t(invFx * fy * a)));
pset_and_clip(x + 1, y + 1, image_set_bgra_alpha(clrAtr, uint8_t(fx * fy * a)));
}
/// @brief This is used to plot a text "pixel" on a "text" surface. The pixel is clipped if it is outside bounds
/// @param x The x position
/// @param y The y position
/// @param clrAtr A combination of the ASCII character and the text color attributes
inline void Graphics_SetTextPixelClipped_(int32_t x, int32_t y, uint32_t clrAtr)
{
auto width = write_page->width;
if (x >= 0 and x < width and y >= 0 and y < write_page->height)
{
*(reinterpret_cast<uint16_t *>(write_page->offset) + width * y + x) = (uint16_t)clrAtr;
}
}
/// @brief This selects the correct "SetPixel" function for later rendering
inline void Graphics_SelectSetPixelFunction_()
{
Graphics_SetPixel_ = write_page->text ? Graphics_SetTextPixelClipped_ : pset_and_clip;
}
/// @brief Public library function for plotting pixels on text and graphic surfaces. This will clip out-of-bounds pixels
/// @param x The x position
/// @param y The y position
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
inline void Graphics_DrawPixel(int32_t x, int32_t y, uint32_t clrAtr)
{
Graphics_SelectSetPixelFunction_();
Graphics_SetPixel_(x, y, clrAtr);
}
/// @brief This plots a pixel on a 32-bit graphic surface. The pixel is clipped if it is outside bounds.
/// @param wx The x position (floating-point).
/// @param wy The y position (floating-point).
/// @param clrAtr A 32-bit RGBA color.
inline void Graphics_DrawPixelAA(float wx, float wy, uint32_t clrAtr)
{
if (write_page->bits_per_pixel == 32)
{
Graphics_SetPixelAA_(wx, wy, clrAtr);
}
}
/// @brief Makes a character + text attribute pair for text mode images
/// @param character An ASCII character
/// @param fColor The foreground color (0 - 15)
/// @param bColor The background color (0 - 15)
/// @return A 16-bit text + color attribute pair
inline constexpr uint16_t Graphics_MakeTextColorAttribute(uint8_t character, uint8_t fColor, uint8_t bColor)
{
return (uint16_t)character | ((((bColor > 7) << 7) | (bColor << 4) | (fColor & 0x0F)) << 8);
}
/// @brief Makes a character + text attribute pair for text mode images using the _DEFAULTCOLOR and _BACKGROUNDCOLOR
/// @param character An ASCII character
/// @return A 16-bit text + color attribute pair
inline uint16_t Graphics_MakeDefaultTextColorAttribute(uint8_t character)
{
return (uint16_t)character | ((((write_page->color > 15) << 7) | ((write_page->background_color & 0xFF) << 4) | (write_page->color & 0x0F)) << 8);
}
/// @brief Sets the foreground color for the current destination image
/// @param fColor The foreground color (0 - 15 for text mode)
inline void Graphics_SetForegroundColor(uint32_t fColor)
{
write_page->color = write_page->text ? fColor & 0x0F : fColor;
}
/// @brief Gets the foreground color for the current destination image
/// @return The foreground color (0 - 15 for text mode)
inline uint32_t Graphics_GetForegroundColor()
{
return write_page->text ? write_page->color & 0x0F : write_page->color;
}
/// @brief Sets the background color for the current destination image
/// @param bColor The background color (0 - 15 for text mode)
inline void Graphics_SetBackgroundColor(uint32_t bColor)
{
if (write_page->text)
{
write_page->background_color = bColor & 0x07;
write_page->color = write_page->color | ((bColor > 7) << 4);
}
else
{
write_page->background_color = bColor;
}
}
/// @brief Gets the background color for the current destination image
/// @return The background color (0 - 15 for text mode)
inline uint32_t Graphics_GetBackgroundColor()
{
return write_page->text ? (write_page->background_color & 0x07) | ((write_page->color > 15) << 3) : write_page->background_color;
}
/// @brief Draws a horizontal line (works in both text and graphics modes)
/// @param lx Left x position
/// @param ty Top y position
/// @param rx Right x position
/// @param c A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawHorizontalLine(int32_t lx, int32_t ty, int32_t rx, uint32_t clrAtr)
{
// Ensure the starting and ending coordinates are ordered correctly
if (lx > rx)
std::swap(lx, rx);
// Ensure ty is within the image height
if (ty < 0 || ty >= write_page->height || lx >= write_page->width || rx < 0)
return; // Line is completely outside the image
// Clip the line to the image boundaries
if (lx < 0)
lx = 0;
if (rx >= write_page->width)
rx = write_page->width - 1;
TOOLBOX64_DEBUG_PRINT("Drawing line segment: (%i, %i) - (%i, %i)", lx, ty, rx, ty);
if (write_page->text)
{
// Get pointer to the starting "pixel"
auto buffer = (reinterpret_cast<uint16_t *>(write_page->offset) + write_page->width * ty + lx);
// Draw the complete line
std::fill(buffer, buffer + (1 + rx - lx), clrAtr);
}
else
{
// Use a different method for non-text mode
fast_boxfill(lx, ty, rx, ty, clrAtr);
}
}
/// @brief Draws a vertical line (works in both text and graphics modes)
/// @param lx Left x position
/// @param ty Top y position
/// @param by Bottom y position
/// @param c A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawVerticalLine(int32_t lx, int32_t ty, int32_t by, uint32_t clrAtr)
{
// Ensure the starting and ending coordinates are ordered correctly
if (ty > by)
std::swap(ty, by);
// Ensure lx is within the image width
if (lx < 0 || lx >= write_page->width || ty >= write_page->height || by < 0)
return; // Line is completely outside the image
// Clip the line to the image boundaries
if (ty < 0)
ty = 0;
if (by >= write_page->height)
by = write_page->height - 1;
TOOLBOX64_DEBUG_PRINT("Drawing line segment: (%i, %i) - (%i, %i)", lx, ty, lx, by);
if (write_page->text)
{
// Get pointer to the starting "pixel"
auto buffer = (reinterpret_cast<uint16_t *>(write_page->offset) + write_page->width * ty + lx);
// Draw the "pixels" and then step by image width to get to the next pixel
for (auto y = ty; y <= by; y++)
{
*buffer = clrAtr;
buffer += write_page->width;
}
}
else
{
// Use a different method for non-text mode
fast_boxfill(lx, ty, lx, by, clrAtr);
}
}
/// @brief Draws a rectangle (works in both text and graphics modes)
/// @param lx Left x position
/// @param ty Top y position
/// @param rx Right x position
/// @param by Bottom y position
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawRectangle(int32_t lx, int32_t ty, int32_t rx, int32_t by, uint32_t clrAtr)
{
// Draw the top and bottom sides. No need to re-order; Graphics_DrawHorizontalLine() will do that
Graphics_DrawHorizontalLine(lx, ty, rx, clrAtr);
Graphics_DrawHorizontalLine(lx, by, rx, clrAtr);
// Ensure the starting and ending coordinates are ordered correctly
if (ty > by)
std::swap(ty, by);
// Avoid re-drawing corners
++ty;
--by;
// Draw the left and right sides
if (by >= ty)
{
Graphics_DrawVerticalLine(lx, ty, by, clrAtr);
Graphics_DrawVerticalLine(rx, ty, by, clrAtr);
}
}
/// @brief Draws a filled rectangle (works in both text and graphics modes)
/// @param lx Left x position
/// @param ty Top y position
/// @param rx Right x position
/// @param by Bottom y position
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawFilledRectangle(int32_t lx, int32_t ty, int32_t rx, int32_t by, uint32_t clrAtr)
{
// Ensure the starting and ending coordinates are ordered correctly
if (lx > rx)
std::swap(lx, rx);
if (ty > by)
std::swap(ty, by);
// Leave if rectangle is completely outside the image
if (lx >= write_page->width || ty >= write_page->height || rx < 0 || by < 0)
return;
// Clip rectangle to image
if (lx < 0)
lx = 0;
if (rx >= write_page->width)
rx = write_page->width - 1;
if (ty < 0)
ty = 0;
if (by >= write_page->height)
by = write_page->height - 1;
TOOLBOX64_DEBUG_PRINT("Drawing filled rectangle: (%i, %i) - (%i, %i)", lx, ty, rx, ty);
if (write_page->text)
{
// Get pointer to the starting "pixel"
auto buffer = (reinterpret_cast<uint16_t *>(write_page->offset) + write_page->width * ty + lx);
// Draw one complete line
auto rectWidth = 1 + rx - lx;
std::fill(buffer, buffer + rectWidth, clrAtr);
// Copy the remaining lines
rectWidth <<= 1; // Since we are dealing with 2 byte attributes
auto dest = buffer + write_page->width; // Get the pointer to the next line
for (auto y = ty; y < by; y++) // "y < by" since we already rendered the first line using std::fill
{
memcpy(dest, buffer, rectWidth); // Copy the first line
dest += write_page->width; // Move to the next line
}
}
else
{
// Use a different method for non-text mode
fast_boxfill(lx, ty, rx, by, clrAtr);
}
}
/// @brief This is an internal line drawing routine. This does not draw the last pixel and hence can be used to make multi-line shapes
/// @param x1 Starting position x
/// @param y1 Starting position y
/// @param x2 Ending position x
/// @param y2 Ending position y
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
inline void Graphics_DrawLineInternal_(int32_t x1, int32_t y1, int32_t x2, int32_t y2, uint32_t clrAtr)
{
bool isVerticalLonger = false;
int32_t shortDistance = y2 - y1;
int32_t longDistance = x2 - x1;
if (abs(shortDistance) > abs(longDistance))
{
std::swap(shortDistance, longDistance);
isVerticalLonger = true;
}
int32_t increment, endDistance = longDistance;
if (longDistance < 0)
{
increment = -1;
longDistance = -longDistance;
}
else
{
increment = 1;
}
int32_t deltaIncrement;
if (longDistance == 0)
{
deltaIncrement = 0;
}
else
{
deltaIncrement = (shortDistance << 16) / longDistance;
}
int32_t j = 0;
if (isVerticalLonger)
{
for (int32_t i = 0; i != endDistance; i += increment)
{
Graphics_SetPixel_(x1 + (j >> 16), y1 + i, clrAtr);
j += deltaIncrement;
}
}
else
{
for (int32_t i = 0; i != endDistance; i += increment)
{
Graphics_SetPixel_(x1 + i, y1 + (j >> 16), clrAtr);
j += deltaIncrement;
}
}
}
/// @brief Draws a line from x1, y1 to x2, y2 (works in both text and graphics modes)
/// @param x1 Starting position x
/// @param y1 Starting position y
/// @param x2 Ending position x
/// @param y2 Ending position y
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawLine(int32_t x1, int32_t y1, int32_t x2, int32_t y2, uint32_t clrAtr)
{
// Check if both endpoints of the line are outside the image bounds
if ((x1 < 0 && x2 < 0) || (x1 >= write_page->width && x2 >= write_page->width) || (y1 < 0 && y2 < 0) || (y1 >= write_page->height && y2 >= write_page->height))
return; // Line is completely outside the image
// Select the correct pixel drawing routine just once
Graphics_SelectSetPixelFunction_();
// Call the internal line-drawing routine. This will use whatever pixel drawing routine was selected
Graphics_DrawLineInternal_(x1, y1, x2, y2, clrAtr);
// Plot the ending pixel
Graphics_SetPixel_(x2, y2, clrAtr);
}
/// @brief Draws a circle (works in both text and graphics modes)
/// @param x The circles center x position
/// @param y The circles center y position
/// @param radius The radius of the circle
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawCircle(int32_t x, int32_t y, int32_t radius, uint32_t clrAtr)
{
// Clip the circle completely if bounding box is completely off-image
if (x + radius < 0 || x - radius >= write_page->width || y + radius < 0 || y - radius >= write_page->height)
return;
Graphics_SelectSetPixelFunction_();
// Special case: draw a single pixel if the radius is <= zero
if (radius <= 0)
{
Graphics_SetPixel_(x, y, clrAtr);
return;
}
int32_t p = 1 - radius, cx = 0, cy = radius, px, py;
do
{
// Calculate the eight symmetric points and set the pixels
px = x + cx;
py = y + cy;
Graphics_SetPixel_(px, py, clrAtr);
px = x - cx;
Graphics_SetPixel_(px, py, clrAtr);
px = x + cx;
py = y - cy;
Graphics_SetPixel_(px, py, clrAtr);
px = x - cx;
Graphics_SetPixel_(px, py, clrAtr);
px = x + cy;
py = y + cx;
Graphics_SetPixel_(px, py, clrAtr);
py = y - cx;
Graphics_SetPixel_(px, py, clrAtr);
px = x - cy;
py = y + cx;
Graphics_SetPixel_(px, py, clrAtr);
py = y - cx;
Graphics_SetPixel_(px, py, clrAtr);
++cx;
if (p < 0)
{
p += ((cx << 1) + 1);
}
else
{
cy--;
p += (((cx - cy) << 1) + 1);
}
} while (cx <= cy);
}
/// @brief Draws a filled circle (works in both text and graphics modes)
/// @param x The circles center x position
/// @param y The circles center y position
/// @param radius The radius of the circle
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawFilledCircle(int32_t x, int32_t y, int32_t radius, uint32_t clrAtr)
{
// Clip the circle completely if bounding box is completely off-image
if (x + radius < 0 || x - radius >= write_page->width || y + radius < 0 || y - radius >= write_page->height)
return;
// Special case: draw a single pixel if the radius is < zero
if (radius <= 0)
{
Graphics_DrawPixel(x, y, clrAtr);
return;
}
// Initialize the coordinates and error term
auto px = radius, py = 0, radiusError = -radius;
// Draw the central horizontal line
Graphics_DrawFilledRectangle(x - px, y, x + px, y, clrAtr);
while (px > py)
{
// Update the error term
radiusError += (py << 1) + 1;
if (radiusError >= 0)
{
if (px != py + 1)
{
// Draw horizontal lines at the top and bottom of the circle
Graphics_DrawFilledRectangle(x - py, y - px, x + py, y - px, clrAtr);
Graphics_DrawFilledRectangle(x - py, y + px, x + py, y + px, clrAtr);
}
// Decrease the x coordinate and update the error term
--px;
radiusError -= px << 1;
}
// Increase the y coordinate
++py;
// Draw horizontal lines at the top and bottom of the circle
Graphics_DrawFilledRectangle(x - px, y - py, x + px, y - py, clrAtr);
Graphics_DrawFilledRectangle(x - px, y + py, x + px, y + py, clrAtr);
}
}
/// @brief Draws an ellipse (works in both text and graphics modes)
/// @param x The circles center x position
/// @param y The circles center y position
/// @param rx The horizontal radius
/// @param ry The vertical radius
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawEllipse(int32_t x, int32_t y, int32_t rx, int32_t ry, uint32_t clrAtr)
{
// Calculate the bounding box
auto left = x - rx;
auto right = x + rx;
auto top = y - ry;
auto bottom = y + ry;
// Clip the ellipse completely if bounding box is completely off-image
if (right < 0 || left >= write_page->width || bottom < 0 || top >= write_page->height)
return;
Graphics_SelectSetPixelFunction_();
// Special case: draw a single pixel if both rx and ry are <= zero
if (rx <= 0 && ry <= 0)
{
Graphics_SetPixel_(x, y, clrAtr);
return;
}
// Special case for rx = 0: draw a vline
if (rx == 0)
{
Graphics_DrawVerticalLine(x, top, bottom, clrAtr);
return;
}
// Special case for ry = 0: draw a hline
if (ry == 0)
{
Graphics_DrawHorizontalLine(left, y, right, clrAtr);
return;
}
int32_t ix, iy;
int32_t h, i, j, k;
h = i = j = k = 0xFFFF;
if (rx > ry)
{
ix = 0;
iy = rx << 6;
do
{
int32_t oh = h;
int32_t oi = i;
int32_t oj = j;
int32_t ok = k;
h = (ix + 32) >> 6;
i = (iy + 32) >> 6;
j = (h * ry) / rx;
k = (i * ry) / rx;
if ((h != oh || k != ok) && (h < oi))
{
Graphics_SetPixel_(x + h, y + k, clrAtr);
Graphics_SetPixel_(x - h, y + k, clrAtr);
Graphics_SetPixel_(x + h, y - k, clrAtr);
Graphics_SetPixel_(x - h, y - k, clrAtr);
}
if ((i != oi || j != oj) && (h < i))
{
Graphics_SetPixel_(x + i, y + j, clrAtr);
Graphics_SetPixel_(x - i, y + j, clrAtr);
Graphics_SetPixel_(x + i, y - j, clrAtr);
Graphics_SetPixel_(x - i, y - j, clrAtr);
}
ix = ix + (iy / rx);
iy = iy - (ix / rx);
} while (i > h);
}
else
{
ix = 0;
iy = ry << 6;
do
{
int32_t oh = h;
int32_t oi = i;
int32_t oj = j;
int32_t ok = k;
h = (ix + 32) >> 6;
i = (iy + 32) >> 6;
j = (h * rx) / ry;
k = (i * rx) / ry;
if ((j != oj || i != oi) && (h < i))
{
Graphics_SetPixel_(x + j, y + i, clrAtr);
Graphics_SetPixel_(x - j, y + i, clrAtr);
Graphics_SetPixel_(x + j, y - i, clrAtr);
Graphics_SetPixel_(x - j, y - i, clrAtr);
}
if ((k != ok || h != oh) && (h < oi))
{
Graphics_SetPixel_(x + k, y + h, clrAtr);
Graphics_SetPixel_(x - k, y + h, clrAtr);
Graphics_SetPixel_(x + k, y - h, clrAtr);
Graphics_SetPixel_(x - k, y - h, clrAtr);
}
ix = ix + (iy / ry);
iy = iy - (ix / ry);
} while (i > h);
}
}
/// @brief Draws a filled ellipse (works in both text and graphics modes)
/// @param cx The circles center x position
/// @param cy The circles center y position
/// @param rx The horizontal radius
/// @param ry The vertical radius
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawFilledEllipse(int32_t cx, int32_t cy, int32_t rx, int32_t ry, uint32_t clrAtr)
{
// Calculate the bounding box
auto left = cx - rx;
auto right = cx + rx;
auto top = cy - ry;
auto bottom = cy + ry;
// Clip the ellipse completely if bounding box is outside the image bounds
if (right < 0 || left >= write_page->width || bottom < 0 || top >= write_page->height)
return;
// Special case if both rx and ry are <= zero: draw a single pixel
if (rx <= 0 && ry <= 0)
{
Graphics_DrawPixel(cx, cy, clrAtr);
return;
}
// Special case for rx = 0: draw a vline
if (rx == 0)
{
Graphics_DrawVerticalLine(cx, top, bottom, clrAtr);
return;
}
// Special case for ry = 0: draw a hline
if (ry == 0)
{
Graphics_DrawHorizontalLine(left, cy, right, clrAtr);
return;
}
int32_t a = 2 * rx * rx;
int32_t b = 2 * ry * ry;
int32_t x = rx;
int32_t y = 0;
int32_t xx = ry * ry * (1 - rx - rx);
int32_t yy = rx * rx;
int32_t sx = b * rx;
int32_t sy = 0;
int32_t e = 0;
while (sx >= sy)
{
Graphics_DrawHorizontalLine(cx - x, cy - y, cx + x, clrAtr);
if (y != 0)
Graphics_DrawHorizontalLine(cx - x, cy + y, cx + x, clrAtr);
y = y + 1;
sy = sy + a;
e = e + yy;
yy = yy + a;
if ((e + e + xx) > 0)
{
x = x - 1;
sx = sx - b;
e = e + xx;
xx = xx + b;
}
}
x = 0;
y = ry;
xx = rx * ry;
yy = rx * rx * (1 - ry - ry);
e = 0;
sx = 0;
sy = a * ry;
while (sx <= sy)
{
Graphics_DrawHorizontalLine(cx - x, cy - y, cx + x, clrAtr);
Graphics_DrawHorizontalLine(cx - x, cy + y, cx + x, clrAtr);
do
{
x = x + 1;
sx = sx + b;
e = e + xx;
xx = xx + b;
} while ((e + e + yy) <= 0);
y = y - 1;
sy = sy - a;
e = e + yy;
yy = yy + a;
}
}
/// @brief Draws a triangle outline (works in both text and graphics modes)
/// @param x1 Vertex 1 x
/// @param y1 Vertex 1 y
/// @param x2 Vertex 2 x
/// @param y2 Vertex 2 y
/// @param x3 Vertex 3 x
/// @param y3 Vertex 3 y
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawTriangle(int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t x3, int32_t y3, uint32_t clrAtr)
{
// Sort vertices by their y-coordinates
if (y1 > y2)
{
std::swap(x1, x2);
std::swap(y1, y2);
}
if (y1 > y3)
{
std::swap(x1, x3);
std::swap(y1, y3);
}
if (y2 > y3)
{
std::swap(x2, x3);
std::swap(y2, y3);
}
// Check if the entire triangle is outside the image bounds
if (x3 < 0 || x1 >= write_page->width || y3 < 0 || y1 >= write_page->height)
return; // The triangle is completely outside the image
// Select the correct pixel drawing routine just once
Graphics_SelectSetPixelFunction_();
// Now draw the 3 sides. Since we are using the internal line drawing function, this will not re-draw the vertices
Graphics_DrawLineInternal_(x1, y1, x2, y2, clrAtr);
Graphics_DrawLineInternal_(x2, y2, x3, y3, clrAtr);
Graphics_DrawLineInternal_(x3, y3, x1, y1, clrAtr);
}
/// @brief Draws a filled triangle (works in both text and graphics modes)
/// @param x1 Vertex 1 x
/// @param y1 Vertex 1 y
/// @param x2 Vertex 2 x
/// @param y2 Vertex 2 y
/// @param x3 Vertex 3 x
/// @param y3 Vertex 3 y
/// @param clrAtr A color index for index graphics surfaces or a text color attribute for text surfaces or a 32-bit RGBA color
void Graphics_DrawFilledTriangle(int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t x3, int32_t y3, uint32_t clrAtr)
{
// Sort vertices by their y-coordinates
if (y1 > y2)
{
std::swap(x1, x2);
std::swap(y1, y2);
}
if (y1 > y3)
{
std::swap(x1, x3);
std::swap(y1, y3);
}
if (y2 > y3)
{
std::swap(x2, x3);
std::swap(y2, y3);
}
// Check if the entire triangle is outside the image bounds
if (x3 < 0 || x1 >= write_page->width || y3 < 0 || y1 >= write_page->height)
{
return; // The triangle is completely outside the image
}
// Calculate slopes of the two lines
float invSlope1 = (float)(x2 - x1) / (y2 - y1);
float invSlope2 = (float)(x3 - x1) / (y3 - y1);
float curX1 = x1;
float curX2 = x1;
// Fill the top part of the triangle
for (int32_t scanlineY = y1; scanlineY <= y2; scanlineY++)
{
Graphics_DrawHorizontalLine(curX1, scanlineY, curX2, clrAtr);
curX1 += invSlope1;
curX2 += invSlope2;
}
// Calculate the new slope for the bottom part of the clipped triangle
invSlope1 = (float)(x3 - x2) / (y3 - y2);
curX1 = x2;
// Fill the bottom part of the triangle
for (int32_t scanlineY = y2 + 1; scanlineY <= y3; scanlineY++)
{
Graphics_DrawHorizontalLine(curX1, scanlineY, curX2, clrAtr);
curX1 += invSlope1;
curX2 += invSlope2;
}
}
/// @brief Makes a RGBA color from RGBA components
/// @param r Red (0 - 255)
/// @param g Green (0 - 255)
/// @param b Blue (0 - 255)
/// @param a Alpha (0 - 255)
/// @return Returns an RGBA color
inline constexpr uint32_t Graphics_MakeRGBA(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
{
return ((static_cast<uint32_t>(a) << 24) | (static_cast<uint32_t>(b) << 16) | (static_cast<uint32_t>(g) << 8) | static_cast<uint32_t>(r));
}
/// @brief Returns the Red component
/// @param rgba An RGBA color
/// @return Red
inline constexpr uint8_t Graphics_GetRedFromRGBA(uint32_t rgba)
{
return static_cast<uint8_t>(rgba);
}
/// @brief Returns the Green component
/// @param rgba An RGBA color
/// @return Green
inline constexpr uint8_t Graphics_GetGreenFromRGBA(uint32_t rgba)
{
return static_cast<uint8_t>(rgba >> 8);
}
/// @brief Returns the Blue component
/// @param rgba An RGBA color
/// @return Blue
inline constexpr uint8_t Graphics_GetBlueFromRGBA(uint32_t rgba)
{
return static_cast<uint8_t>(rgba >> 16);
}
/// @brief Returns the Alpha value.
/// @param rgba An RGBA color.
/// @return Alpha.
inline constexpr uint8_t Graphics_GetAlphaFromRGBA(uint32_t rgba)
{
return static_cast<uint8_t>(rgba >> 24);
}
/// @brief Interpolates between two colors.
/// @param colorA The first color.
/// @param colorB The second color.
/// @param factor The interpolation factor.
/// @return The interpolated color.
inline constexpr auto Graphics_InterpolateColor(uint32_t colorA, uint32_t colorB, float factor)
{
auto a = func__alpha32(colorA);
auto r = func__red32(colorA);
auto g = func__green32(colorA);
auto b = func__blue32(colorA);
return func__rgba32(r + int32_t((func__red32(colorB) - r) * factor), g + int32_t((func__green32(colorB) - g) * factor), b + int32_t((func__blue32(colorB) - b) * factor), a + int32_t((func__alpha32(colorB) - a) * factor));
}
/// @brief Calculates the distance between two colors.
/// @param colorA The first color.
/// @param colorB The second color.
/// @return The distance between the two colors.
inline auto Graphics_GetRGBDistance(uint32_t colorA, uint32_t colorB)
{
return image_calculate_rgb_distance(image_get_bgra_red(colorA), image_get_bgra_green(colorA), image_get_bgra_blue(colorA), image_get_bgra_red(colorB), image_get_bgra_green(colorB), image_get_bgra_blue(colorB));
}
/// @brief Calculates the delta between two colors.
/// @param colorA The first color.
/// @param colorB The second color.
/// @return The delta between the two colors.
inline auto Graphics_GetRGBDelta(uint32_t colorA, uint32_t colorB)
{
return image_get_color_delta(image_get_bgra_red(colorA), image_get_bgra_green(colorA), image_get_bgra_blue(colorA), image_get_bgra_red(colorB), image_get_bgra_green(colorB), image_get_bgra_blue(colorB));
}
/// @brief Set the text image's transparent "color" that will be used by Graphics_PutTextImage()
/// @param imageHandle A valid text image handle
/// @param clrAtr A text color attribute for text surfaces. See Graphics_MakeTextColorAttribute()
void Graphics_SetTextImageClearColor(int32_t imageHandle, uint32_t clrAtr)
{
img_struct *textImage;
// Validate image handle
if (imageHandle >= 0)
{
validatepage(imageHandle);
textImage = &img[page[imageHandle]];
}
else
{
imageHandle = -imageHandle;
if (imageHandle >= nextimg)
{
error(QB_ERROR_INVALID_HANDLE);
return;
}
textImage = &img[imageHandle];
if (!textImage->valid)
{
error(QB_ERROR_INVALID_HANDLE);
return;
}
}