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#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;
}
}
}
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