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#include <math.h>
#include <SDL.h>
#include <SDL_image.h>
#include <SDL_rotozoom.h>
#include <SDL_gfxBlitFunc.h>
#include "osc_graphics.h"
#include "layer_image.h"
Layer::CtorInfo LayerImage::ctor_info = {"image", "s" /* file */};
#if 0
static inline void
rgba_blit_with_alpha(SDL_Surface *src_surf, SDL_Surface *dst_surf, Uint8 alpha)
{
SDL_FillRect(dst_surf, NULL,
SDL_MapRGBA(dst_surf->format,
0, 0, 0, SDL_ALPHA_TRANSPARENT));
SDL_gfxBlitRGBA(src_surf, NULL, dst_surf, NULL);
SDL_gfxMultiplyAlpha(dst_surf, alpha);
}
#else
static inline void
rgba_blit_with_alpha(SDL_Surface *src_surf, SDL_Surface *dst_surf, Uint8 alpha)
{
Uint8 *src = (Uint8 *)src_surf->pixels;
Uint8 *dst = (Uint8 *)dst_surf->pixels;
SDL_PixelFormat *fmt = src_surf->format;
int inc = fmt->BytesPerPixel;
int len = src_surf->w * src_surf->h;
SDL_MAYBE_LOCK(src_surf);
SDL_MAYBE_LOCK(dst_surf);
GFX_DUFFS_LOOP4({
register Uint32 pixel;
register int a;
pixel = *(Uint32 *)src;
a = ((pixel & fmt->Amask) >> fmt->Ashift) << fmt->Aloss;
a = (a*alpha)/SDL_ALPHA_OPAQUE;
a = (a << fmt->Aloss) << fmt->Ashift;
pixel &= ~fmt->Amask;
pixel |= a;
*(Uint32 *)dst = pixel;
src += inc;
dst += inc;
}, len)
SDL_MAYBE_UNLOCK(dst_surf);
SDL_MAYBE_UNLOCK(src_surf);
}
#endif
LayerImage::LayerImage(const char *name, SDL_Rect geo, float opacity,
const char *file) :
Layer(name),
surf_alpha(NULL), surf_scaled(NULL), surf(NULL)
{
file_osc_id = register_method("file", "s",
(OSCServer::MethodHandlerCb)file_osc);
LayerImage::alpha(opacity);
LayerImage::geo(geo);
LayerImage::file(file);
}
void
LayerImage::geo(SDL_Rect geo)
{
if (!geo.x && !geo.y && !geo.w && !geo.h)
geov = (SDL_Rect){0, 0, screen->w, screen->h};
else
geov = geo;
if (!surf)
return;
if (surf_scaled &&
surf_scaled->w == geov.w && surf_scaled->h == geov.h)
return;
SDL_FREESURFACE_SAFE(surf_alpha);
SDL_FREESURFACE_SAFE(surf_scaled);
if (surf->w != geov.w || surf->h != geov.h) {
surf_scaled = zoomSurface(surf,
(double)geov.w/surf->w,
(double)geov.h/surf->h,
SMOOTHING_ON);
}
alpha(alphav);
}
void
LayerImage::alpha(float opacity)
{
SDL_Surface *use_surf = surf_scaled ? : surf;
Uint8 alpha = (Uint8)ceilf(opacity*SDL_ALPHA_OPAQUE);
alphav = opacity;
if (!use_surf)
return;
if (!use_surf->format->Amask) {
if (alpha == SDL_ALPHA_OPAQUE)
SDL_SetAlpha(use_surf, 0, 0);
else
SDL_SetAlpha(use_surf, SDL_SRCALPHA | SDL_RLEACCEL, alpha);
return;
}
if (alpha == SDL_ALPHA_OPAQUE) {
SDL_FREESURFACE_SAFE(surf_alpha);
return;
}
if (!surf_alpha) {
surf_alpha = SDL_CreateRGBSurface(use_surf->flags,
use_surf->w, use_surf->h,
use_surf->format->BitsPerPixel,
use_surf->format->Rmask,
use_surf->format->Gmask,
use_surf->format->Bmask,
use_surf->format->Amask);
}
if (alpha == SDL_ALPHA_TRANSPARENT) {
SDL_FillRect(surf_alpha, NULL,
SDL_MapRGBA(surf_alpha->format,
0, 0, 0, SDL_ALPHA_TRANSPARENT));
} else {
rgba_blit_with_alpha(use_surf, surf_alpha, alpha);
}
}
void
LayerImage::file(const char *file)
{
SDL_FREESURFACE_SAFE(surf_alpha);
SDL_FREESURFACE_SAFE(surf_scaled);
SDL_FREESURFACE_SAFE(surf);
if (!file || !*file)
return;
surf = IMG_Load(file);
if (!surf) {
SDL_IMAGE_ERROR("IMG_Load");
exit(EXIT_FAILURE);
}
geo(geov);
}
void
LayerImage::frame(SDL_Surface *target)
{
if (surf)
SDL_BlitSurface(surf_alpha ? : surf_scaled ? : surf, NULL,
target, &geov);
}
LayerImage::~LayerImage()
{
unregister_method(file_osc_id);
SDL_FREESURFACE_SAFE(surf_alpha);
SDL_FREESURFACE_SAFE(surf_scaled);
SDL_FREESURFACE_SAFE(surf);
}
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