/**
* @name teleaf_canvas_context_2d_rebind
* @brief if the given context is active, rebind it
* @param ctx - (context_2d *) context to rebind
* @retval NONE
*/
void tealeaf_canvas_context_2d_rebind(context_2d *ctx)
{
if (canvas.active_ctx == ctx) {
canvas.active_ctx = NULL;
tealeaf_canvas_context_2d_bind(ctx);
}
}
/**
* @name context_2d_bind
* @brief bind's the given context to gl and enables / disables scissors
* @param ctx - (context_2d *) context to bind
* @retval NONE
*/
void context_2d_bind(context_2d *ctx) {
if (tealeaf_canvas_context_2d_bind(ctx)) {
if (IS_SCISSOR_ENABLED(ctx)) {
enable_scissor(ctx);
} else {
disable_scissor(ctx);
}
}
}
/**
Saves the given context_2d's buffer to a file of the given filetype
@param ctx the given context2d
@param file_name filename to save the buffer to
@return void
**/
char *context_2d_save_buffer_to_base64(context_2d *ctx, const char *image_type) {
//bind offscreen buffer to gl frame buffer
tealeaf_canvas_context_2d_bind(ctx);
unsigned char *buffer = (unsigned char*)context_2d_read_pixels(ctx);
//opengGL gives this as RGBA, Need to switch to
//BGRA which will be interpreted as ARGB in Java
//becuase of the endianess difference between Java/C
// int i;
// for(i = 0; i < ctx->width * ctx->height * 4; i+=4) {
// char r = buffer[i];
// buffer[i] = buffer[i + 2];
// buffer[i + 2] = r;
// }
char *buf = (char*)write_image_to_base64(image_type, buffer, ctx->width, ctx->height, 4);
tealeaf_canvas_context_2d_bind(context_2d_get_onscreen());
free(buffer);
return buf;
}
/**
* @name tealeaf_canvas_init
* @brief initilizes the tealeaf canvas object
* @param framebuffer_name - (int) gl id of the onscreen framebuffer
* @retval NONE
*/
void tealeaf_canvas_init(int framebuffer_name) {
LOG("{canvas} Initializing Canvas");
int width = config_get_screen_width();
int height = config_get_screen_height();
GLuint offscreen_buffer_name;
GLTRACE(glGenFramebuffers(1, &offscreen_buffer_name));
canvas.offscreen_framebuffer = offscreen_buffer_name;
canvas.view_framebuffer = framebuffer_name;
canvas.onscreen_ctx = context_2d_init(&canvas, "onscreen", -1, true);
canvas.onscreen_ctx->width = width;
canvas.onscreen_ctx->height = height;
canvas.active_ctx = 0;
// TODO: should_resize is not respected on iOS
tealeaf_canvas_context_2d_bind(canvas.onscreen_ctx);
}