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paysages3d/gui_gtk/preview.c
Michaël Lemaire bfd25bcf42 paysages: Refactoring sources (WIP) 
git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@199 b1fd45b6-86a6-48da-8261-f70d1f35bdcc
2011-12-23 22:00:19 +00:00

432 lines
11 KiB
C
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/* Small preview management */
#include <string.h>
#include <math.h>
#include "common.h"
#include "../shared/types.h"
#include "../shared/functions.h"
#include "../shared/constants.h"
#include "../shared/system.h"
#include "../water.h"
#define MAX_PREVIEWS 30
struct SmallPreview
{
double conf_scroll_xmin;
double conf_scroll_xmax;
double conf_scroll_ymin;
double conf_scroll_ymax;
double conf_scale_min;
double conf_scale_max;
double conf_scale_step;
double xoffset;
double yoffset;
double scaling;
Mutex* lock;
GdkPixbuf* pixbuf;
GtkImage* image;
int mousex;
int mousey;
int need_rerender;
int need_render;
int need_update;
SmallPreviewCallback renderer;
};
static int _previews_count = 0;
static SmallPreview _preview[MAX_PREVIEWS];
static Thread* _thread_update;
static inline void _forceRender(SmallPreview* preview)
{
gdk_pixbuf_fill(preview->pixbuf, 0x00000000);
preview->need_rerender = 0;
preview->need_render = 1;
}
static inline void _updateImage(SmallPreview* preview)
{
gtk_image_set_from_pixbuf(preview->image, preview->pixbuf);
}
static inline void _renderPixbuf(SmallPreview* preview)
{
int x, y, done;
Color col;
void* pixels = gdk_pixbuf_get_pixels(preview->pixbuf);
guint32* pixel;
int rowstride = gdk_pixbuf_get_rowstride(preview->pixbuf);
/* TODO Use pixbuf size */
for (x = 0; x < 256; x++)
{
mutexAcquire(preview->lock);
if (preview->need_rerender)
{
mutexRelease(preview->lock);
break;
}
done = 0;
for (y = 0; y < 256; y++)
{
pixel = (guint32*)(pixels + y * rowstride + x * 4);
if (!*pixel)
{
col = preview->renderer(preview, (double)(x - 128) * preview->scaling + preview->xoffset, (double)(y - 128) * preview->scaling + preview->yoffset, preview->xoffset, preview->yoffset, preview->scaling);
*pixel = (guint32)colorTo32BitRGBA(&col);
done = 1;
}
}
if (done)
{
preview->need_update = 1;
}
mutexRelease(preview->lock);
}
}
static void* _doRenders(void* data)
{
int i;
SmallPreview* preview;
while (1)
{
for (i = 0; i < _previews_count; i++)
{
preview = _preview + i;
if (preview->need_rerender)
{
_forceRender(preview);
}
if (preview->need_render)
{
preview->need_render = 0;
_renderPixbuf(preview);
}
}
timeSleepMs(100);
}
return NULL;
}
static int _doUpdates(void* data)
{
int i;
SmallPreview* preview;
for (i = 0; i < _previews_count; i++)
{
preview = _preview + i;
if (preview->need_update)
{
preview->need_update = 0;
_updateImage(preview);
}
}
return 1;
}
static void _scrollPixbuf(SmallPreview* preview, int dx, int dy)
{
int xstart, ystart, xsize, ysize, y;
void* pixels = gdk_pixbuf_get_pixels(preview->pixbuf);
int rowstride = gdk_pixbuf_get_rowstride(preview->pixbuf);
preview->xoffset -= (double)dx * preview->scaling;
preview->yoffset -= (double)dy * preview->scaling;
/* TODO Use pixbuf size */
if (dx == 0 && dy == 0)
{
return;
}
else if (dx <= -256 || dx >= 256 || dy <= -256 || dy >= 256)
{
_forceRender(preview);
}
else
{
if (dx < 0)
{
xstart = -dx;
xsize = 256 + dx;
}
else
{
xstart = 0;
xsize = 256 - dx;
}
if (dy < 0)
{
ystart = -dy;
ysize = 256 + dy;
}
else
{
ystart = 0;
ysize = 256 - dy;
}
memmove(pixels + (ystart + dy) * rowstride + (xstart + dx) * 4, pixels + ystart * rowstride + xstart * 4, (ysize - 1) * rowstride + xsize * 4);
if (dy < 0)
{
memset(pixels + (256 + dy) * rowstride, 0, (-dy - 1) * rowstride + 256 * 4);
}
else if (dy > 0)
{
memset(pixels, 0, (dy - 1) * rowstride + 256 * 4);
}
if (dx < 0)
{
for (y = ystart + dy; y < ystart + dy + ysize; y++)
{
memset(pixels + y * rowstride + xsize * 4, 0, -dx * 4);
}
}
else if (dx > 0)
{
for (y = ystart + dy; y < ystart + dy + ysize; y++)
{
memset(pixels + y * rowstride, 0, dx * 4);
}
}
preview->need_render = 1;
}
}
static inline int _fixScroll(SmallPreview* preview, int dx, int dy, int* new_dx, int* new_dy)
{
*new_dx = dx;
*new_dy = dy;
if (preview->xoffset - dx * preview->scaling > preview->conf_scroll_xmax)
{
*new_dx = (int)floor((preview->conf_scroll_xmax - preview->xoffset) / preview->scaling);
}
if (preview->xoffset - dx * preview->scaling < preview->conf_scroll_xmin)
{
*new_dx = (int)floor((preview->conf_scroll_xmin - preview->xoffset) / preview->scaling);
}
if (preview->yoffset - dy * preview->scaling > preview->conf_scroll_ymax)
{
*new_dy = (int)floor((preview->conf_scroll_ymax - preview->yoffset) / preview->scaling);
}
if (preview->yoffset - dy * preview->scaling < preview->conf_scroll_ymin)
{
*new_dy = (int)floor((preview->conf_scroll_ymin - preview->yoffset) / preview->scaling);
}
return (*new_dx == 0 && *new_dy == 0) ? 0 : 1;
}
static inline int _fixScaling(SmallPreview* preview, double scaling, double* new_scaling)
{
double old_scaling = preview->scaling;
*new_scaling = scaling;
if (scaling < preview->conf_scale_min)
{
*new_scaling = preview->conf_scale_min;
}
if (scaling > preview->conf_scale_max)
{
*new_scaling = preview->conf_scale_max;
}
return (old_scaling == *new_scaling) ? 0 : 1;
}
static int _cbMouseScroll(GtkEventBox* image, GdkEventScroll* event, gpointer data)
{
SmallPreview* preview = (SmallPreview*)data;
/* TODO Center the zoom on the cursor */
if (event->direction == GDK_SCROLL_UP)
{
mutexAcquire(preview->lock);
if (_fixScaling(preview, preview->scaling - preview->conf_scale_step, &preview->scaling))
{
preview->need_rerender = 1;
}
mutexRelease(preview->lock);
}
else if (event->direction == GDK_SCROLL_DOWN)
{
mutexAcquire(preview->lock);
if (_fixScaling(preview, preview->scaling + preview->conf_scale_step, &preview->scaling))
{
preview->need_rerender = 1;
}
mutexRelease(preview->lock);
}
return 1;
}
static int _cbMouseButtonPressed(GtkEventBox* image, GdkEventButton* event, gpointer data)
{
SmallPreview* preview = (SmallPreview*)data;
if (event->button == 1)
{
preview->mousex = (int)event->x;
preview->mousey = (int)event->y;
}
return 1;
}
static int _cbMouseMove(GtkEventBox* image, GdkEventMotion* event, gpointer data)
{
SmallPreview* preview = (SmallPreview*)data;
int dx, dy;
if (event->state & GDK_BUTTON1_MASK)
{
mutexAcquire(preview->lock);
dx = (int)event->x - preview->mousex;
dy = (int)event->y - preview->mousey;
if (_fixScroll(preview, dx, dy, &dx, &dy))
{
_scrollPixbuf(preview, dx, dy);
}
preview->mousex = (int)event->x;
preview->mousey = (int)event->y;
mutexRelease(preview->lock);
}
return 1;
}
static Color _renderNone(SmallPreview* preview, double x, double y, double xoffset, double yoffset, double scaling)
{
return COLOR_BLACK;
}
void guiPreviewStart()
{
_thread_update = threadCreate(_doRenders, NULL);
g_timeout_add(200, _doUpdates, NULL);
}
void guiPreviewRedraw(SmallPreview* preview)
{
mutexAcquire(preview->lock);
preview->need_rerender = 1;
mutexRelease(preview->lock);
}
void guiPreviewRedrawAll()
{
int i;
for (i = 0; i < _previews_count; i++)
{
guiPreviewRedraw(_preview + i);
}
}
SmallPreview* guiPreviewNew(GtkImage* image)
{
GtkWidget* parent = gtk_widget_get_parent(GTK_WIDGET(image));
SmallPreview* preview;
/* TODO Check the parent can receive events (or is a GtkEventBox) */
if (_previews_count < MAX_PREVIEWS)
{
preview = _preview + _previews_count;
preview->lock = mutexCreate();
preview->conf_scroll_xmin = 0.0;
preview->conf_scroll_xmax = 0.0;
preview->conf_scroll_ymin = 0.0;
preview->conf_scroll_ymax = 0.0;
preview->conf_scale_min = 1.0;
preview->conf_scale_max = 1.0;
preview->conf_scale_step = 0.0;
preview->scaling = 1.0;
preview->xoffset = 0.0;
preview->yoffset = 0.0;
/* TODO Get size from GtkImage */
preview->pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, 1, 8, 256, 256);
preview->image = image;
preview->need_rerender = 0;
preview->need_render = 0;
preview->need_update = 0;
preview->renderer = _renderNone;
gtk_image_clear(image);
_forceRender(preview);
g_signal_connect(parent, "scroll-event", G_CALLBACK(_cbMouseScroll), (gpointer)preview);
g_signal_connect(parent, "button-press-event", G_CALLBACK(_cbMouseButtonPressed), (gpointer)preview);
g_signal_connect(parent, "motion-notify-event", G_CALLBACK(_cbMouseMove), (gpointer)preview);
_previews_count++;
return preview;
}
else
{
/* TODO Return fake preview */
return NULL;
}
}
void guiPreviewConfigScrolling(SmallPreview* preview, double xmin, double xmax, double ymin, double ymax)
{
mutexAcquire(preview->lock);
preview->conf_scroll_xmin = xmin;
preview->conf_scroll_xmax = xmax;
preview->conf_scroll_ymin = ymin;
preview->conf_scroll_ymax = ymax;
preview->need_rerender = 1;
mutexRelease(preview->lock);
}
void guiPreviewConfigScaling(SmallPreview* preview, double min, double max, double step)
{
mutexAcquire(preview->lock);
preview->conf_scale_min = min;
preview->conf_scale_max = max;
preview->conf_scale_step = step;
preview->need_rerender = 1;
mutexRelease(preview->lock);
}
void guiPreviewSetRenderer(SmallPreview* preview, SmallPreviewCallback renderer)
{
mutexAcquire(preview->lock);
preview->renderer = renderer;
preview->need_rerender = 1;
mutexRelease(preview->lock);
}
void guiPreviewSetViewport(SmallPreview* preview, double xoffset, double yoffset, double scaling)
{
mutexAcquire(preview->lock);
preview->xoffset = xoffset;
preview->yoffset = yoffset;
preview->scaling = scaling;
preview->need_rerender = 1;
mutexRelease(preview->lock);
}
void guiPreviewSetTerrainHeight(SmallPreview* preview)
{
/*preview->conf_scroll_x = 1;
preview->conf_scroll_y = 1;
preview->conf_zoom = 1;
preview->init_scaling = preview->scaling = 0.1;
preview->init_xoffset = preview->xoffset = 0.0;
preview->init_yoffset = preview->yoffset = 0.0;
preview->renderer = _renderTopDownHeight;*/
guiPreviewRedraw(preview);
}
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