Handout

kernel/device/graphicsstream.cc

@@ -0,0 +1,131 @@
+#include "./graphicsstream.h"
+
+#include "../debug/assert.h"
+#include "../graphics/fonts/font.h"
+#include "../interrupt/guard.h"
+#include "../utils/alloc.h"
+#include "../utils/math.h"
+
+const Color GraphicsStream::BLACK(0x00, 0x00, 0x00);
+const Color GraphicsStream::BLUE(0x00, 0x00, 0xAA);
+const Color GraphicsStream::GREEN(0x00, 0xAA, 0x00);
+const Color GraphicsStream::CYAN(0x00, 0xAA, 0xAA);
+const Color GraphicsStream::RED(0xAA, 0x00, 0x00);
+const Color GraphicsStream::MAGENTA(0xAA, 0x00, 0xAA);
+const Color GraphicsStream::BROWN(0xAA, 0x55, 0x00);
+const Color GraphicsStream::LIGHT_GREY(0xAA, 0xAA, 0xAA);
+
+const Color GraphicsStream::DARK_GREY(0x55, 0x55, 0x55);
+const Color GraphicsStream::LIGHT_BLUE(0x55, 0x55, 0xFF);
+const Color GraphicsStream::LIGHT_GREEN(0x55, 0xFF, 0x55);
+const Color GraphicsStream::LIGHT_CYAN(0x55, 0xFF, 0xFF);
+const Color GraphicsStream::LIGHT_RED(0xFF, 0x55, 0x55);
+const Color GraphicsStream::LIGHT_MAGENTA(0xFF, 0x55, 0xFF);
+const Color GraphicsStream::YELLOW(0xFF, 0xFF, 0x55);
+const Color GraphicsStream::WHITE(0xFF, 0xFF, 0xFF);
+
+GraphicsStream::GraphicsStream(const Point &start, unsigned width,
+							   unsigned height, Font *const font)
+	: offset(0),
+	  x(0),
+	  y(0),
+	  FONT(font == nullptr ? Font::get() : font),
+	  START(start),
+	  ROWS(height / this->FONT->height),
+	  COLUMNS(width / this->FONT->width) {
+	cell = reinterpret_cast<Cell *>(calloc(ROWS * COLUMNS, sizeof(Cell)));
+}
+
+void GraphicsStream::setPos(int x, int y) {
+	if (x < 0) {
+		x += COLUMNS;
+	}
+	if (y < 0) {
+		y += ROWS;
+	}
+
+	if (x >= 0 && static_cast<unsigned>(x) < COLUMNS && y >= 0 &&
+		static_cast<unsigned>(y) <= ROWS) {
+		this->x = x;
+		this->y = y;
+	}
+}
+
+void GraphicsStream::getPos(int &x, int &y) const {
+	x = this->x;
+	y = this->y;
+}
+
+void GraphicsStream::show(int x, int y, char character, const Color &color) {
+	if (x < 0) {
+		x += COLUMNS;
+	}
+	if (y < 0) {
+		y += ROWS;
+	}
+	// only print if position within the screen range
+	if (x >= 0 && static_cast<unsigned>(x) < COLUMNS && y >= 0 &&
+		static_cast<unsigned>(y) < ROWS) {
+		cell[((offset + y) % ROWS) * COLUMNS + x] = (Cell){character, color};
+	}
+}
+
+void GraphicsStream::print(char *str, int length, const Color &color) {
+	while (length > 0) {
+		switch (*str) {
+			case '\n':
+				for (unsigned i = x; i < COLUMNS; ++i) {
+					show(i, y, ' ', color);
+				}
+				x = 0;
+				y++;
+				break;
+
+			default:
+				show(x, y, *str, color);
+				if (++x >= COLUMNS) {
+					x = 0;
+					y++;
+				}
+				break;
+		}
+		str++;
+		if (y >= ROWS) {
+			offset = (offset + 1) % ROWS;
+			y--;
+			for (unsigned i = 0; i < COLUMNS; ++i) {
+				show(i, y, ' ', color);
+			}
+		}
+		length--;
+	}
+}
+
+void GraphicsStream::reset(char character, const Color &color) {
+	for (unsigned y = 0; y < ROWS; ++y) {
+		for (unsigned x = 0; x < COLUMNS; ++x) {
+			show(x, y, character, color);
+		}
+	}
+	setPos(0, 0);
+}
+
+void GraphicsStream::flush() {
+	print(buffer, pos);
+	pos = 0;
+}
+
+void GraphicsStream::draw() {
+	flush();
+	Point pos = START;
+	for (unsigned y = 0; y < ROWS; y++) {
+		for (unsigned x = 0; x < COLUMNS; x++) {
+			Cell &c = cell[((offset + y) % ROWS) * COLUMNS + x];
+			Guard::enter().vault().graphics.text(pos, &c.character, 1, c.color,
+												 FONT);
+			pos.x += FONT->width;
+		}
+		pos.x = START.x;
+		pos.y += FONT->height;
+	}
+}