refactor: adjust the project infra. (#1)

* refactor: adjust the project infra.

This patch adds cmake build system to the project, and adjust infrastructure
stuff.
Signed-off-by: Jun Zhang <jun@junz.org>

* fix: remove compiler flags that only exist in GCC.

Signed-off-by: Jun Zhang <jun@junz.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/bitmap.cpp b/src/bitmap.cpp
new file mode 100644
index 0000000..612f2af
--- /dev/null
+++ b/src/bitmap.cpp
@@ -0,0 +1,53 @@
+#include "bitmap.h"
+
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb/stb_image.h>
+
+Bitmap::Bitmap(const char* image)
+{
+	int width, height, bitDepth;
+
+	uint8_t* buffer = stbi_load(image, &width, &height, &bitDepth, STBI_rgb_alpha);
+	if (!buffer) {
+		return;
+	}
+
+	this->width = width;
+	this->height = height;
+	data = new uint32_t[width * height];
+
+	for (int i = 0; i < width * height; i++) {
+		uint8_t r = buffer[i * 4 + 0];
+		uint8_t g = buffer[i * 4 + 1];
+		uint8_t b = buffer[i * 4 + 2];
+		uint8_t a = buffer[i * 4 + 3];
+
+		data[i] = (a << 24) | (r << 16) | (g << 8) | b;
+	}
+
+	stbi_image_free(buffer);
+}
+
+void Bitmap::clear(uint32_t colour)
+{
+	memset(data, colour, width * height * 4);
+}
+
+void Bitmap::blit(Bitmap const& other, int xo, int yo, int xc, int yc, int w, int h)
+{
+	constexpr int MaskColour = 0xffff00ff;
+
+	for (int y = 0; y < h; ++y) {
+		int yp = y + yo;
+		if (yp < 0 || yp >= height) continue;
+
+		for (int x = 0; x < w; ++x) {
+			int xp = x + xo;
+			if (xp < 0 || xp >= width) continue;
+
+			int src = other.data[(x + xc) + (y + yc) * other.width];
+			if (src != MaskColour)
+				data[xp + yp * width] = src;
+		}
+	}
+}