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#include "image.h"
#include "3rdparty/stb/stb_image.h"
#include "../utils/utils.h"
#include "../math/math.h"
namespace jin
{
namespace render
{
Image::Image(const char* file)
: Drawable(), pixels(0)
{
loadf(file);
}
Image::Image(const char* buffer, size_t size)
: Drawable(), pixels(0)
{
loadb(buffer, size);
}
Image::~Image()
{
stbi_image_free(pixels);
}
color Image::getPixel(int x, int y)
{
if (without(x, 0, width) || without(y, 0, height))
{
return { 0 };
}
return pixels[x + y * width];
}
bool Image::loadf(const char* f)
{
unsigned char* imageData = stbi_load(f, &width, &height, NULL, STBI_rgb_alpha);
if (imageData == 0) return false;
pixels = (color*)imageData;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width,
height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData);
// set render vertices
Drawable::setVertices(
new float [DRAWABLE_V_SIZE] {
0, 0,
0, (float)height,
(float)width, (float)height,
(float)width, 0,
},
new float [DRAWABLE_V_SIZE] {
0, 0,
0, 1,
1, 1,
1, 0
}
);
return true;
}
bool Image::loadb(const char* b, size_t size)
{
// ʹstbi_load_from_memory
unsigned char* imageData = stbi_load_from_memory((unsigned char *)b, size, &width, &height, NULL, STBI_rgb_alpha);
if (imageData == 0) return false;
pixels = (color*)imageData;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width,
height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData);
// set render vertices
Drawable::setVertices(
new float [DRAWABLE_V_SIZE] {
0, 0,
0, (float)height,
(float)width, (float)height,
(float)width, 0,
},
new float [DRAWABLE_V_SIZE] {
0, 0,
0, 1,
1, 1,
1, 0
}
);
return true;
}
}
}
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