void Image::setPixel( int x, int y, Color c ){
assert( width > 0 && height > 0);
ensureBuffer();
if(x>=0&&y>=0&&x<width&&y<height){
int index = ( x + y * width ) * 4;
buffer[index] = (unsigned char) (c.r*255);
buffer[index+1] = (unsigned char) (c.g*255);
buffer[index+2] = (unsigned char) (c.b*255);
buffer[index+3] = (unsigned char) (c.a*255);
}
modified_pixel_num += 1;
}
bool Image::loadPNG( const char *path, bool multiply_color_by_alpha ) {
const char *cpath = platformCStringPath(path);
FILE *fp = fopen(cpath,"rb");
if(!fp) {
print( "Image::loadPNG: can't open file:%s", cpath );
return false;
}
unsigned error;
unsigned char* image_data;
unsigned w, h;
error = lodepng_decode32_file(&image_data, &w, &h, cpath );
if(error) {
fprintf(stderr, "decoder error %u: %s\n", error, lodepng_error_text(error) );
FREE(image_data);
fclose(fp);
return false;
}
width = w;
height = h;
if( multiply_color_by_alpha ) multiplyAlphaRGBA(image_data,width,height);
ensureBuffer();
#define IMAGE_BUFFER_COPY \
for(int i=0;i<width*height;i++){ \
int x = i % width; \
int y = (i / width); \
int ii = y * width + x; \
buffer[ii*4+0] = image_data[i*4+0]; /*r*/ \
buffer[ii*4+1] = image_data[i*4+1]; /*g*/ \
buffer[ii*4+2] = image_data[i*4+2]; /*b*/ \
buffer[ii*4+3] = image_data[i*4+3]; /*a*/ \
}
IMAGE_BUFFER_COPY;
// clean up
FREE(image_data);
fclose(fp);
strncpy( last_load_file_path, path, sizeof(last_load_file_path) );
return true;
}
bool Image::loadPNGMem( unsigned char *ptr, size_t sz, bool multiply_color_by_alpha ) {
unsigned error;
unsigned char* image_data = (unsigned char*) MALLOC( 2048 * 2048 * 4 );
unsigned w, h;
error = lodepng_decode32( &image_data, &w, &h, ptr,sz );
if(error) {
fprintf(stderr, "decoder error %u: %s\n", error, lodepng_error_text(error) );
FREE(image_data);
return false;
}
width = w;
height = h;
if( multiply_color_by_alpha ) multiplyAlphaRGBA(image_data,width,height);
ensureBuffer();
IMAGE_BUFFER_COPY;
FREE(image_data);
return true;
}
void writeDouble(double value)
{
ensureBuffer(8);
memcpy(&data[offset], &value, sizeof(double));
offset += 8;
}
void writeFloat(float value)
{
ensureBuffer(4);
memcpy(&data[offset], &value, sizeof(float));
offset += 4;
}
void writeInt(unsigned int value)
{
ensureBuffer(4);
memcpy(&data[offset], &value, sizeof(unsigned int));
offset += 4;
}
void writeBytes(const char* value, UTsize size)
{
ensureBuffer(size);
memcpy(data + sizeof(unsigned char)*offset, value, size);
offset += size;
}
void writeByte(unsigned char value)
{
ensureBuffer(1);
data[offset] = value;
offset++;
}
void Image::setSize(int w, int h ) {
width = w; height = h;
ensureBuffer();
}
