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sdl zooming 

Hi all,
this patch implements zooming capabilities for the sdl interface.
A new sdl_zoom_blit function is added that is able to scale and blit a
portion of a surface into another.
This way we can enable SDL_RESIZABLE and have a real_screen surface with
a different size than the guest surface and let sdl_zoom_blit take care
of the problem.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Stefano Stabellini 2009-06-24 11:58:25 +01:00 committed by Anthony Liguori
parent 14899cdf3a
commit c18a2c360e
6 changed files with 413 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Makefile
View File

@ -165,7 +165,7 @@ OBJS+=$(addprefix audio/, $(AUDIO_OBJS))
OBJS+=keymaps.o
ifdef CONFIG_SDL
OBJS+=sdl.o x_keymap.o
OBJS+=sdl.o sdl_zoom.o x_keymap.o
endif
ifdef CONFIG_CURSES
OBJS+=curses.o
@ -209,7 +209,9 @@ cocoa.o: cocoa.m
keymaps.o: keymaps.c keymaps.h
sdl.o: sdl.c keymaps.h sdl_keysym.h
sdl_zoom.o: sdl_zoom.c sdl_zoom.h sdl_zoom_template.h
sdl.o: sdl.c keymaps.h sdl_keysym.h sdl_zoom.h
sdl.o audio/sdlaudio.o baum.o: CFLAGS += $(SDL_CFLAGS)

4
console.h
View File

@ -75,6 +75,7 @@ void kbd_put_keysym(int keysym);
#define QEMU_BIG_ENDIAN_FLAG 0x01
#define QEMU_ALLOCATED_FLAG 0x02
#define QEMU_REALPIXELS_FLAG 0x04
struct PixelFormat {
uint8_t bits_per_pixel;
@ -172,7 +173,8 @@ static inline int is_surface_bgr(DisplaySurface *surface)
static inline int is_buffer_shared(DisplaySurface *surface)
{
return (!(surface->flags & QEMU_ALLOCATED_FLAG));
return (!(surface->flags & QEMU_ALLOCATED_FLAG) &&
!(surface->flags & QEMU_REALPIXELS_FLAG));
}
static inline void register_displaychangelistener(DisplayState *ds, DisplayChangeListener *dcl)

78
sdl.c
View File

@ -32,6 +32,7 @@
#include "console.h"
#include "sysemu.h"
#include "x_keymap.h"
#include "sdl_zoom.h"
static DisplayChangeListener *dcl;
static SDL_Surface *real_screen;
@ -54,20 +55,29 @@ static int guest_cursor = 0;
static int guest_x, guest_y;
static SDL_Cursor *guest_sprite = 0;
static uint8_t allocator;
static uint8_t hostbpp;
static SDL_PixelFormat host_format;
static int scaling_active = 0;
static void sdl_update(DisplayState *ds, int x, int y, int w, int h)
{
// printf("updating x=%d y=%d w=%d h=%d\n", x, y, w, h);
SDL_Rect rec;
rec.x = x;
rec.y = y;
rec.w = w;
rec.h = h;
if (guest_screen) {
SDL_Rect rec;
rec.x = x;
rec.y = y;
rec.w = w;
rec.h = h;
SDL_BlitSurface(guest_screen, &rec, real_screen, &rec);
}
SDL_UpdateRect(real_screen, x, y, w, h);
if (!scaling_active) {
SDL_BlitSurface(guest_screen, &rec, real_screen, &rec);
} else {
if (sdl_zoom_blit(guest_screen, real_screen, SMOOTHING_ON, &rec) < 0) {
fprintf(stderr, "Zoom blit failed\n");
exit(1);
}
}
}
SDL_UpdateRect(real_screen, rec.x, rec.y, rec.w, rec.h);
}
static void sdl_setdata(DisplayState *ds)
@ -92,7 +102,7 @@ static void do_sdl_resize(int new_width, int new_height, int bpp)
// printf("resizing to %d %d\n", w, h);
flags = SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL;
flags = SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL|SDL_RESIZABLE;
if (gui_fullscreen)
flags |= SDL_FULLSCREEN;
if (gui_noframe)
@ -110,7 +120,10 @@ static void do_sdl_resize(int new_width, int new_height, int bpp)
static void sdl_resize(DisplayState *ds)
{
if (!allocator) {
do_sdl_resize(ds_get_width(ds), ds_get_height(ds), 0);
if (!scaling_active)
do_sdl_resize(ds_get_width(ds), ds_get_height(ds), 0);
else if (real_screen->format->BitsPerPixel != ds_get_bits_per_pixel(ds))
do_sdl_resize(real_screen->w, real_screen->h, ds_get_bits_per_pixel(ds));
sdl_setdata(ds);
} else {
if (guest_screen != NULL) {
@ -163,8 +176,26 @@ static DisplaySurface* sdl_create_displaysurface(int width, int height)
surface->width = width;
surface->height = height;
if (scaling_active) {
if (host_format.BytesPerPixel != 2 && host_format.BytesPerPixel != 4) {
surface->linesize = width * 4;
surface->pf = qemu_default_pixelformat(32);
} else {
surface->linesize = width * host_format.BytesPerPixel;
surface->pf = sdl_to_qemu_pixelformat(&host_format);
}
#ifdef WORDS_BIGENDIAN
surface->flags = QEMU_ALLOCATED_FLAG | QEMU_BIG_ENDIAN_FLAG;
#else
surface->flags = QEMU_ALLOCATED_FLAG;
#endif
surface->data = (uint8_t*) qemu_mallocz(surface->linesize * surface->height);
if (hostbpp == 16)
return surface;
}
if (host_format.BitsPerPixel == 16)
do_sdl_resize(width, height, 16);
else
do_sdl_resize(width, height, 32);
@ -174,9 +205,9 @@ static DisplaySurface* sdl_create_displaysurface(int width, int height)
surface->data = real_screen->pixels;
#ifdef WORDS_BIGENDIAN
surface->flags = QEMU_ALLOCATED_FLAG | QEMU_BIG_ENDIAN_FLAG;
surface->flags = QEMU_REALPIXELS_FLAG | QEMU_BIG_ENDIAN_FLAG;
#else
surface->flags = QEMU_ALLOCATED_FLAG;
surface->flags = QEMU_REALPIXELS_FLAG;
#endif
allocator = 1;
@ -188,6 +219,9 @@ static void sdl_free_displaysurface(DisplaySurface *surface)
allocator = 0;
if (surface == NULL)
return;
if (surface->flags & QEMU_ALLOCATED_FLAG)
qemu_free(surface->data);
qemu_free(surface);
}
@ -482,8 +516,8 @@ static void sdl_send_mouse_event(int dx, int dy, int dz, int x, int y, int state
static void toggle_full_screen(DisplayState *ds)
{
gui_fullscreen = !gui_fullscreen;
do_sdl_resize(real_screen->w, real_screen->h, real_screen->format->BitsPerPixel);
if (gui_fullscreen) {
scaling_active = 0;
gui_saved_grab = gui_grab;
sdl_grab_start();
} else {
@ -675,6 +709,18 @@ static void sdl_refresh(DisplayState *ds)
}
}
break;
case SDL_VIDEORESIZE:
{
SDL_ResizeEvent *rev = &ev->resize;
int bpp = real_screen->format->BitsPerPixel;
if (bpp != 16 && bpp != 32)
bpp = 32;
do_sdl_resize(rev->w, rev->h, bpp);
scaling_active = 1;
vga_hw_invalidate();
vga_hw_update();
break;
}
default:
break;
}
@ -783,7 +829,7 @@ void sdl_display_init(DisplayState *ds, int full_screen, int no_frame)
exit(1);
}
vi = SDL_GetVideoInfo();
hostbpp = vi->vfmt->BitsPerPixel;
host_format = *(vi->vfmt);
dcl = qemu_mallocz(sizeof(DisplayChangeListener));
dcl->dpy_update = sdl_update;

94
sdl_zoom.c Normal file
View File

@ -0,0 +1,94 @@
/*
* SDL_zoom - surface scaling
*
* Copyright (c) 2009 Citrix Systems, Inc.
*
* Derived from: SDL_rotozoom, LGPL (c) A. Schiffler from the SDL_gfx library.
* Modifications by Stefano Stabellini.
*
* This work is licensed under the terms of the GNU GPL version 2.
* See the COPYING file in the top-level directory.
*
*/
#include "sdl_zoom.h"
#include "osdep.h"
#include <stdint.h>
static int sdl_zoom_rgb16(SDL_Surface *src, SDL_Surface *dst, int smooth,
SDL_Rect *dst_rect);
static int sdl_zoom_rgb32(SDL_Surface *src, SDL_Surface *dst, int smooth,
SDL_Rect *dst_rect);
#define BPP 32
#include "sdl_zoom_template.h"
#undef BPP
#define BPP 16
#include "sdl_zoom_template.h"
#undef BPP
int sdl_zoom_blit(SDL_Surface *src_sfc, SDL_Surface *dst_sfc, int smooth,
SDL_Rect *in_rect)
{
SDL_Rect zoom, src_rect;
int extra;
/* Grow the size of the modified rectangle to avoid edge artefacts */
src_rect.x = (in_rect->x > 0) ? (in_rect->x - 1) : 0;
src_rect.y = (in_rect->y > 0) ? (in_rect->y - 1) : 0;
src_rect.w = in_rect->w + 1;
if (src_rect.x + src_rect.w > src_sfc->w)
src_rect.w = src_sfc->w - src_rect.x;
src_rect.h = in_rect->h + 1;
if (src_rect.y + src_rect.h > src_sfc->h)
src_rect.h = src_sfc->h - src_rect.y;
/* (x,y) : round down */
zoom.x = (int)(((float)(src_rect.x * dst_sfc->w)) / (float)(src_sfc->w));
zoom.y = (int)(((float)(src_rect.y * dst_sfc->h)) / (float)(src_sfc->h));
/* (w,h) : round up */
zoom.w = (int)( ((double)((src_rect.w * dst_sfc->w) + (src_sfc->w - 1))) /
(double)(src_sfc->w));
zoom.h = (int)( ((double)((src_rect.h * dst_sfc->h) + (src_sfc->h - 1))) /
(double)(src_sfc->h));
/* Account for any (x,y) rounding by adding one-source-pixel's worth
* of destination pixels and then edge checking.
*/
extra = ((dst_sfc->w-1) / src_sfc->w) + 1;
if ((zoom.x + zoom.w) < (dst_sfc->w - extra))
zoom.w += extra;
else
zoom.w = dst_sfc->w - zoom.x;
extra = ((dst_sfc->h-1) / src_sfc->h) + 1;
if ((zoom.y + zoom.h) < (dst_sfc->h - extra))
zoom.h += extra;
else
zoom.h = dst_sfc->h - zoom.y;
/* The rectangle (zoom.x, zoom.y, zoom.w, zoom.h) is the area on the
* destination surface that needs to be updated.
*/
if (src_sfc->format->BitsPerPixel == 32)
sdl_zoom_rgb32(src_sfc, dst_sfc, smooth, &zoom);
else if (src_sfc->format->BitsPerPixel == 16)
sdl_zoom_rgb16(src_sfc, dst_sfc, smooth, &zoom);
else {
fprintf(stderr, "pixel format not supported\n");
return -1;
}
/* Return the rectangle of the update to the caller */
*in_rect = zoom;
return 0;
}

25
sdl_zoom.h Normal file
View File

@ -0,0 +1,25 @@
/*
* SDL_zoom - surface scaling
*
* Copyright (c) 2009 Citrix Systems, Inc.
*
* Derived from: SDL_rotozoom, LGPL (c) A. Schiffler from the SDL_gfx library.
* Modifications by Stefano Stabellini.
*
* This work is licensed under the terms of the GNU GPL version 2.
* See the COPYING file in the top-level directory.
*
*/
#ifndef _SDL_zoom_h
#define _SDL_zoom_h
#include <SDL/SDL.h>
#define SMOOTHING_OFF 0
#define SMOOTHING_ON 1
int sdl_zoom_blit(SDL_Surface *src_sfc, SDL_Surface *dst_sfc,
int smooth, SDL_Rect *src_rect);
#endif /* _SDL_zoom_h */

225
sdl_zoom_template.h Normal file
View File

@ -0,0 +1,225 @@
/*
* SDL_zoom_template - surface scaling
*
* Copyright (c) 2009 Citrix Systems, Inc.
*
* Derived from: SDL_rotozoom, LGPL (c) A. Schiffler from the SDL_gfx library.
* Modifications by Stefano Stabellini.
*
* This work is licensed under the terms of the GNU GPL version 2.
* See the COPYING file in the top-level directory.
*
*/
#if BPP == 16
#define SDL_TYPE Uint16
#elif BPP == 32
#define SDL_TYPE Uint32
#else
#error unsupport depth
#endif
/*
* Simple helper functions to make the code looks nicer
*
* Assume spf = source SDL_PixelFormat
* dpf = dest SDL_PixelFormat
*
*/
#define getRed(color) (((color) & spf->Rmask) >> spf->Rshift)
#define getGreen(color) (((color) & spf->Gmask) >> spf->Gshift)
#define getBlue(color) (((color) & spf->Bmask) >> spf->Bshift)
#define getAlpha(color) (((color) & spf->Amask) >> spf->Ashift)
#define setRed(r, pcolor) do { \
*pcolor = ((*pcolor) & (~(dpf->Rmask))) + \
(((r) & (dpf->Rmask >> dpf->Rshift)) << dpf->Rshift); \
} while (0);
#define setGreen(g, pcolor) do { \
*pcolor = ((*pcolor) & (~(dpf->Gmask))) + \
(((g) & (dpf->Gmask >> dpf->Gshift)) << dpf->Gshift); \
} while (0);
#define setBlue(b, pcolor) do { \
*pcolor = ((*pcolor) & (~(dpf->Bmask))) + \
(((b) & (dpf->Bmask >> dpf->Bshift)) << dpf->Bshift); \
} while (0);
#define setAlpha(a, pcolor) do { \
*pcolor = ((*pcolor) & (~(dpf->Amask))) + \
(((a) & (dpf->Amask >> dpf->Ashift)) << dpf->Ashift); \
} while (0);
static int glue(sdl_zoom_rgb, BPP)(SDL_Surface *src, SDL_Surface *dst, int smooth,
SDL_Rect *dst_rect)
{
int x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy, ex, ey, t1, t2, sstep, sstep_jump;
SDL_TYPE *c00, *c01, *c10, *c11, *sp, *csp, *dp;
int d_gap;
SDL_PixelFormat *spf = src->format;
SDL_PixelFormat *dpf = dst->format;
if (smooth) {
/* For interpolation: assume source dimension is one pixel.
* Smaller here to avoid overflow on right and bottom edge.
*/
sx = (int) (65536.0 * (float) (src->w - 1) / (float) dst->w);
sy = (int) (65536.0 * (float) (src->h - 1) / (float) dst->h);
} else {
sx = (int) (65536.0 * (float) src->w / (float) dst->w);
sy = (int) (65536.0 * (float) src->h / (float) dst->h);
}
if ((sax = (int *) malloc((dst->w + 1) * sizeof(Uint32))) == NULL) {
return (-1);
}
if ((say = (int *) malloc((dst->h + 1) * sizeof(Uint32))) == NULL) {
free(sax);
return (-1);
}
sp = csp = (SDL_TYPE *) src->pixels;
dp = (SDL_TYPE *) (dst->pixels + dst_rect->y * dst->pitch +
dst_rect->x * dst->format->BytesPerPixel);
csx = 0;
csax = sax;
for (x = 0; x <= dst->w; x++) {
*csax = csx;
csax++;
csx &= 0xffff;
csx += sx;
}
csy = 0;
csay = say;
for (y = 0; y <= dst->h; y++) {
*csay = csy;
csay++;
csy &= 0xffff;
csy += sy;
}
d_gap = dst->pitch - dst_rect->w * dst->format->BytesPerPixel;
if (smooth) {
csay = say;
for (y = 0; y < dst_rect->y; y++) {
csay++;
sstep = (*csay >> 16) * src->pitch;
csp = (SDL_TYPE *) ((Uint8 *) csp + sstep);
}
/* Calculate sstep_jump */
csax = sax;
sstep_jump = 0;
for (x = 0; x < dst_rect->x; x++) {
csax++;
sstep = (*csax >> 16);
sstep_jump += sstep;
}
for (y = 0; y < dst_rect->h ; y++) {
/* Setup colour source pointers */
c00 = csp + sstep_jump;
c01 = c00 + 1;
c10 = (SDL_TYPE *) ((Uint8 *) csp + src->pitch) + sstep_jump;
c11 = c10 + 1;
csax = sax + dst_rect->x;
for (x = 0; x < dst_rect->w; x++) {
/* Interpolate colours */
ex = (*csax & 0xffff);
ey = (*csay & 0xffff);
t1 = ((((getRed(*c01) - getRed(*c00)) * ex) >> 16) +
getRed(*c00)) & (dpf->Rmask >> dpf->Rshift);
t2 = ((((getRed(*c11) - getRed(*c10)) * ex) >> 16) +
getRed(*c10)) & (dpf->Rmask >> dpf->Rshift);
setRed((((t2 - t1) * ey) >> 16) + t1, dp);
t1 = ((((getGreen(*c01) - getGreen(*c00)) * ex) >> 16) +
getGreen(*c00)) & (dpf->Gmask >> dpf->Gshift);
t2 = ((((getGreen(*c11) - getGreen(*c10)) * ex) >> 16) +
getGreen(*c10)) & (dpf->Gmask >> dpf->Gshift);
setGreen((((t2 - t1) * ey) >> 16) + t1, dp);
t1 = ((((getBlue(*c01) - getBlue(*c00)) * ex) >> 16) +
getBlue(*c00)) & (dpf->Bmask >> dpf->Bshift);
t2 = ((((getBlue(*c11) - getBlue(*c10)) * ex) >> 16) +
getBlue(*c10)) & (dpf->Bmask >> dpf->Bshift);
setBlue((((t2 - t1) * ey) >> 16) + t1, dp);
t1 = ((((getAlpha(*c01) - getAlpha(*c00)) * ex) >> 16) +
getAlpha(*c00)) & (dpf->Amask >> dpf->Ashift);
t2 = ((((getAlpha(*c11) - getAlpha(*c10)) * ex) >> 16) +
getAlpha(*c10)) & (dpf->Amask >> dpf->Ashift);
setAlpha((((t2 - t1) * ey) >> 16) + t1, dp);
/* Advance source pointers */
csax++;
sstep = (*csax >> 16);
c00 += sstep;
c01 += sstep;
c10 += sstep;
c11 += sstep;
/* Advance destination pointer */
dp++;
}
/* Advance source pointer */
csay++;
csp = (SDL_TYPE *) ((Uint8 *) csp + (*csay >> 16) * src->pitch);
/* Advance destination pointers */
dp = (SDL_TYPE *) ((Uint8 *) dp + d_gap);
}
} else {
csay = say;
for (y = 0; y < dst_rect->y; y++) {
csay++;
sstep = (*csay >> 16) * src->pitch;
csp = (SDL_TYPE *) ((Uint8 *) csp + sstep);
}
/* Calculate sstep_jump */
csax = sax;
sstep_jump = 0;
for (x = 0; x < dst_rect->x; x++) {
csax++;
sstep = (*csax >> 16);
sstep_jump += sstep;
}
for (y = 0 ; y < dst_rect->h ; y++) {
sp = csp + sstep_jump;
csax = sax + dst_rect->x;
for (x = 0; x < dst_rect->w; x++) {
/* Draw */
*dp = *sp;
/* Advance source pointers */
csax++;
sstep = (*csax >> 16);
sp += sstep;
/* Advance destination pointer */
dp++;
}
/* Advance source pointers */
csay++;
sstep = (*csay >> 16) * src->pitch;
csp = (SDL_TYPE *) ((Uint8 *) csp + sstep);
/* Advance destination pointer */
dp = (SDL_TYPE *) ((Uint8 *) dp + d_gap);
}
}
free(sax);
free(say);
return (0);
}
#undef SDL_TYPE