C++ draw_image函数代码示例

void render_exit_menu(exit_menu_t *state, float cursor_x, float cursor_y)
{
    // Update center of cursor
    set_cursor_position(state->cursor_state, cursor_x, cursor_y);

    // Check if anything selected
    check_cursor_in_image(state->cursor_state, state->mandelbrot_state);
    check_cursor_in_image(state->cursor_state, state->sph_state);
    check_cursor_in_image(state->cursor_state, state->terminal_state);

    // Draw background rectangle
    float center[2] = {0.0f, 0.0f};
    float gl_dims[2] = {2.0f, 0.7f};
    float background_color[4] = {1.0f, 1.0f, 1.0f, 0.8f};
    render_rectangle(state->rectangle_state, center, gl_dims, background_color);

    // Draw mandelbrot image
    draw_image(state->mandelbrot_state);

    // Draw terminal image
    draw_image(state->terminal_state);

    // Draw SPH image
    draw_image(state->sph_state);

    // Draw cursor
    draw_cursor(state->cursor_state);
}

int main (int argc, char **argv) {
    SDL_Surface *screen = NULL;
    SDL_Window *window = NULL;

    if (startup("Space Shooter")) {
        SDL_Surface *background = load_image("assets/background.png");
        SDL_Surface *ship = load_image("assets/captain.png");

        draw_image(background, 0, 0);
        draw_image(ship, 100, 100);
        SDL_UpdateWindowSurface(g_window);

        #if __EMSCRIPTEN__
        #else
            SDL_Delay(5000);
        #endif

        SDL_FreeSurface(background);
        SDL_FreeSurface(ship);
    }
    else {
        printf("Could not initialise SDL\n");
    }

    SDL_DestroyWindow(g_window);
    SDL_Quit();
    return 0;
}

/* draw_pipe - draws all active pipes on the screen */
void draw_pipe() {
	
	int i, j, len = 0, actives[MAX_PIPES], offset = 12, bottom_height, cur_ind;
	
	for (i = 0; i < MAX_PIPES; i++)
		if (pipes[i].active)
			actives[len++] = i;
	
	
	for (j = 0; j < len; j++) {
		
		cur_ind = actives[j];
		
		bottom_height = (GROUND_HEIGHT - offset - (PIPE_GAP + 
						pipes[cur_ind].height * pipes[cur_ind].pipe->h)) / pipes[cur_ind].pipe->h;

		for (i = 0; i < pipes[cur_ind].height - 2; i++) {
			draw_image(pipes[cur_ind].pipe, pipes[cur_ind].x, i * pipes[cur_ind].pipe->h);
		}

		for (i = pipes[cur_ind].height - 2; i <= pipes[cur_ind].height; i++) {
			draw_image(pipes[cur_ind].pipe_top, pipes[cur_ind].x - 2, i * pipes[cur_ind].pipe->h - 1);
		}

		for (i = 0; i < bottom_height - 2; i++) {
			draw_image(pipes[cur_ind].pipe, pipes[cur_ind].x, 
			           GROUND_HEIGHT - offset - i * pipes[cur_ind].pipe->h);
		}

		for (i = bottom_height - 2; i <= bottom_height; i++) {
			draw_image(pipes[cur_ind].pipe_top, pipes[cur_ind].x - 2, 
					   GROUND_HEIGHT - offset - i * pipes[cur_ind].pipe->h - 1);
		}
	}
}

static void othello_color_draw(PzWidget *wid, ttk_surface srf)
{
	unsigned char xline, yline, c;
	int x, y, step, startx, endx, size;

#ifdef SDL
	ttk_fillrect(srf, 0,0, wid->w, wid->h, ttk_ap_getx("window.bg")->color);
#endif
	step = (wid->h / 8);
	size = step * 8;
	startx = (wid->w - wid->h) / 2;
	endx = startx + size;
	ttk_fillrect(srf, startx,0, endx, size, BGCOLOR);
	for (x = 0; x < 9; ++x) {
		int mod = (size / 8) * x;
		ttk_line(srf, startx, mod, endx, mod, 0x000000);
		ttk_line(srf, startx + mod, 0, startx + mod, size, 0x000000);
	}
	yline = 0;
	for (c = 0; c < 64; c++) {
		xline = c % 8;
		x = xline * step + step/2 + startx;
		y = yline * step + step/2 + 0;
		if (_othello->b_set & (1ULL << c)) {
			if (_othello->board & (1ULL << c))
				draw_image(_othello->black, srf, x, y);
			else
				draw_image(_othello->white, srf, x, y);
		}
		else if (_othello->cur_bit == c)
			draw_image(_othello->selection, srf, x, y);
		if (xline == 7) yline++;
	}
}

int main (int argc, char **argv)
{
    HPDF_Doc  pdf;
    HPDF_Font font;
    HPDF_Page page;
    char fname[256];
    HPDF_Destination dst;

    strcpy (fname, argv[0]);
    strcat (fname, ".pdf");

    pdf = HPDF_New (error_handler, NULL);
    if (!pdf) {
        printf ("error: cannot create PdfDoc object\n");
        return 1;
    }

    /* error-handler */
    if (setjmp(env)) {
        HPDF_Free (pdf);
        return 1;
    }

    HPDF_SetCompressionMode (pdf, HPDF_COMP_ALL);

    /* create default-font */
    font = HPDF_GetFont (pdf, "Helvetica", NULL);

    /* add a new page object. */
    page = HPDF_AddPage (pdf);

    HPDF_Page_SetWidth (page, 650);
    HPDF_Page_SetHeight (page, 500);

    dst = HPDF_Page_CreateDestination (page);
    HPDF_Destination_SetXYZ (dst, 0, HPDF_Page_GetHeight (page), 1);
    HPDF_SetOpenAction(pdf, dst);

    HPDF_Page_BeginText (page);
    HPDF_Page_SetFontAndSize (page, font, 20);
    HPDF_Page_MoveTextPos (page, 220, HPDF_Page_GetHeight (page) - 70);
    HPDF_Page_ShowText (page, "JpegDemo");
    HPDF_Page_EndText (page);

    HPDF_Page_SetFontAndSize (page, font, 12);

    draw_image (pdf, "rgb.jpg", 70, HPDF_Page_GetHeight (page) - 410,
                "24bit color image");
    draw_image (pdf, "gray.jpg", 340, HPDF_Page_GetHeight (page) - 410,
                "8bit grayscale image");

    /* save the document to a file */
    HPDF_SaveToFile (pdf, fname);

    /* clean up */
    HPDF_Free (pdf);

    return 0;
}

void render_switcher(struct desktop *desktops)
{		
	tile_image(theme->tile_img, switcher_pos, switcher_width);
	if (!desktops)
		return;
	int ox = switcher_pos;
	int limgw, rimgw;
	ox += theme->switcher.space_gap;
	uint state;
	struct desktop *iter = desktops;
	state = iter->focused ? BSTATE_PRESSED : BSTATE_IDLE;
	if (!iter->next)
		draw_switcher_alone(state, ox, iter->width);
	else 
		draw_switcher_left_corner(state, ox, iter->width);
	limgw = get_image_width(theme->switcher.left_corner_img[state]);
	rimgw = get_image_width(theme->switcher.right_img[state]);
	ox += limgw;
	draw_text(theme->switcher.font, theme->switcher.text_align, ox, iter->width - limgw - rimgw,
			theme->switcher.text_offset_x, theme->switcher.text_offset_y,
			iter->name, &theme->switcher.text_color[state]);
	ox += iter->width - limgw;

	if (!iter->next)
		return;
	iter = iter->next;
	state = iter->focused ? BSTATE_PRESSED : BSTATE_IDLE;
	if (theme->switcher.separator_img) {
		draw_image(theme->switcher.separator_img, ox);
		ox += get_image_width(theme->switcher.separator_img);
	}

	limgw = get_image_width(theme->switcher.left_img[state]);
	while (iter->next) {
		draw_switcher_middle(state, ox, iter->width);
		ox += limgw;
		draw_text(theme->switcher.font, theme->switcher.text_align, ox, iter->width - limgw - rimgw,
				theme->switcher.text_offset_x, theme->switcher.text_offset_y,
				iter->name, &theme->switcher.text_color[state]);
		ox += iter->width - limgw;
		iter = iter->next;
		state = iter->focused ? BSTATE_PRESSED : BSTATE_IDLE;
		if (theme->switcher.separator_img) {
			draw_image(theme->switcher.separator_img, ox);
			ox += get_image_width(theme->switcher.separator_img);
		}
	}

	rimgw = get_image_width(theme->switcher.right_corner_img[state]);
	draw_switcher_right_corner(state, ox, iter->width);
	ox += limgw;
	draw_text(theme->switcher.font, theme->switcher.text_align, ox, iter->width - limgw - rimgw,
			theme->switcher.text_offset_x, theme->switcher.text_offset_y,
			iter->name, &theme->switcher.text_color[state]);
}

void Active::draw()
{
    bool blend = (active_flags & TRANSPARENT) || blend_color.a < 255 ||
                  effect != Render::NONE;
    if (blend) {
        draw_image(image, x, y, blend_color, angle, x_scale, y_scale);
        return;
    }
    Render::disable_blend();
    draw_image(image, x, y, blend_color, angle, x_scale, y_scale);
    Render::enable_blend();
}

void SWRenderDisplayWindowProvider::flip(int interval)
{
	SWRenderGraphicContextProvider *gc_provider = static_cast<SWRenderGraphicContextProvider*>(gc.get_provider());
	PixelCanvas *canvas = gc_provider->get_canvas();

#ifdef WIN32
	HWND hwnd = window.get_hwnd();
	HDC hdc = GetDC(hwnd);
	draw_image(hdc, get_viewport(), canvas->to_pixelbuffer());
	ReleaseDC(hwnd, hdc);
#elif !defined(__APPLE__)
	PixelBuffer &image = canvas->to_pixelbuffer();
	draw_image(get_viewport(), image, Rect(0, 0, image.get_width(), image.get_height()));
#endif

	if (interval == -1)
		interval = swap_interval;    // use swap interval from the previous flip
	else
		swap_interval = interval;

	if (interval<=0)
	{
		flip_timer_set = false;
	}
	else
	{
		if (!flip_timer_set)
		{
			flip_last_time = System::get_time();
			flip_timer_set = true;
		}
		else
		{
			ubyte64 current_time = System::get_time();

			int time_diff = current_time - flip_last_time;

			interval *= 1000 / refresh_rate;
			int time_wait = interval - time_diff;

			if ( (time_wait > 0) && (time_wait < interval) )
			{
				System::sleep(time_wait);
				flip_last_time = current_time + time_wait;
			}
			else
			{
				flip_last_time = current_time;
			}
		}
	}
}

	//-----------------------------------------------------------------//
	void monograph::draw_font(int16_t x, int16_t y, char code)
	{
#ifdef KANJI_FONTS
		if(multi_byte_hi_) {
			uint8_t hi = multi_byte_hi_;
			multi_byte_hi_ = 0;
			if(-KANJI_FONT_WIDTH >= x || x >= fb_width_) return;

			if(kanji_mode_ == 0) {
				draw_image_P(x - FONT_WIDTH, y, &font6x12_[9 * 18], 6, 12);
				draw_image_P(x, y, &font6x12_[9 * 19], 6, 12);
				return;
			}

			const uint8_t* bitmap = scan_kanji_bitmap(hi, static_cast<uint8_t>(code));
			if(bitmap != 0) {
				draw_image(x - FONT_WIDTH, y, bitmap, KANJI_FONT_WIDTH, KANJI_FONT_HWIGHT);
			} else {
				uint8_t* bitmap = alloc_kanji_bitmap(hi, static_cast<uint8_t>(code));
				uint16_t pos = sjis_to_liner(hi, static_cast<uint8_t>(code));
				if(read_kanji_bitmap(pos, bitmap)) {
					draw_image(x - FONT_WIDTH, y, bitmap, KANJI_FONT_WIDTH, KANJI_FONT_HEIGHT);
				} else {
					draw_image_P(x - FONT_WIDTH, y, &font6x12_[9 * 18], FONT_WIDTH, FONT_HEIGHT);
					draw_image_P(x, y, &font6x12_[9 * 19], FONT_WIDTH, FONT_HEIGHT);
				}
			}
		} else
#endif
		{
#ifdef LCD128X64
			if(code >= 0) {
				if(-FONT_WIDTH >= x || static_cast<uint16_t>(x) >= fb_width_) {
					return;
				}
				draw_image_P(x, y, &font6x12_[(code << 3) + code], FONT_WIDTH, FONT_HEIGHT);
			} else if(static_cast<uint8_t>(code) >= 0x81
				   && static_cast<uint8_t>(code) <= 0x9f) {
				multi_byte_hi_ = code;
			} else if(static_cast<uint8_t>(code) >= 0xe0
				   && static_cast<uint8_t>(code) <= 0xef) {
				multi_byte_hi_ = code;
			} else {
				// 無効キャラクターの意味として
				multi_byte_hi_ = 0;
				if(-FONT_WIDTH >= x || static_cast<uint16_t>(x) >= fb_width_) return;
				draw_image_P(x, y, &font6x12_[(1 << 3)], FONT_WIDTH, FONT_HEIGHT);
			}
#endif
		}
	}

/* **slide\_title\_in()**, **slide\_title\_out()** and
 * **bling\_title()** are used by the level
 * timeline to animate the title.
 *
 * We use cosine interpolation to slide the title in
 * and out, creating a smoother effect.
 *
 * **progress** will hold a value between 0 to 1
 * based on the event progess/duration, making it ideal
 * for use with interpolation functions.
 */
static void* before_title_in(void* data, float elapsed_ms, float progress)
{
    struct rectangle c = { 0, 0, 192, 108 };
    struct rectangle r = { 0, 0, 64, 64 };
    struct level_data* ldata = data;
    UNUSED(elapsed_ms);
    UNUSED(progress);
    clear_image(ldata->title.mask, color_from_RGB(0, 0, 0));
    draw_on_image(ldata->title.mask);
    draw_image(ldata->title.spot, -15, 40, &r, 0);
    draw_on_screen();
    draw_image(ldata->title.mask, 0, 0, &c, 0);
    return NULL;
}

void show_scores()
{
    int i=0;
    char text_name[25];
    char text_score[25];
    
    TTF_Font *MyFont;
    SDL_Color MyColor = {255,255,255};
    SDL_Color MyColor2 = {255,0,0};
    SDL_Surface *message = NULL;
    
    MyFont = TTF_OpenFont("fonts\\sfont.ttf",20);
    message = TTF_RenderText_Blended(MyFont,"TEAM NAMES",MyColor2);
    draw_image(message,screen,NULL,150,170);
    
    SDL_FreeSurface(message);
    message = NULL;
    
    message = TTF_RenderText_Blended(MyFont,"SCORES",MyColor2);
    draw_image(message,screen,NULL,800,170);

    SDL_FreeSurface(message);
    message = NULL;
    
    read_score();
    sort_score();    

    for(i=0;i<10;++i)
    {
            strcpy(text_name,score[i].name);
            message = TTF_RenderText_Blended(MyFont,text_name,MyColor);
            draw_image(message,screen,NULL,150,200 + (30 * i));
            
            SDL_FreeSurface(message);
            message = NULL;
    
            itoa(score[i].score,text_score,10);
            message = TTF_RenderText_Blended(MyFont,text_score,MyColor);
            draw_image(message,screen,NULL,800,200 + (30 * i));
            
            SDL_FreeSurface(message);
            message = NULL;
    }
    
    SDL_Flip(screen);
    TTF_CloseFont(MyFont);
    SDL_FreeSurface(message);
    MyFont = NULL;
    message = NULL;
}

static void apply_image(GLenum texture, int image)
{
    if (GL_has_multitexture && texture < GL_max_multitexture)
    {
        glActiveTextureARB(texture);

        /* Always apply texture 0, but disable all other unused textures. */

        if (texture == GL_TEXTURE0_ARB || image != 0)
            draw_image(image);
        else
            glDisable(GL_TEXTURE_2D);
    }
    else draw_image(image);
}

static void draw_tile_sequence(Imlib_Image left, Imlib_Image tile, Imlib_Image right,
		int ox, int width)
{
	int lw = get_image_width(left);
	int rw = get_image_width(right);
	int tilew = width - lw - rw;
	if (tilew < 0)
		return;

	draw_image(left, ox);
	ox += lw;
	tile_image(tile, ox, tilew);
	ox += tilew;
	draw_image(right, ox);
}

int main(int argc, char *argv[]) {
  char *prog = argv[0];
  int opt, rc=-1;
  hex_t h;

  utarray_new(cfg.hexv, &hex_icd);

  while ( (opt = getopt(argc, argv, "v+i:o:h")) != -1) {
    switch (opt) {
      case 'v': cfg.verbose++; break;
      case 'i': cfg.infile = strdup(optarg); break;
      case 'o': cfg.outfile = strdup(optarg); break;
      case 'h': default: usage(prog); break;
    }
  }

  if (!cfg.outfile || !cfg.infile) usage(prog);

  /* read input file */
  tpl_node *tn = tpl_map("A(sii)", &h.id, &h.x, &h.y);
  if (tpl_load(tn, TPL_FILE, cfg.infile)) goto done;
  while(tpl_unpack(tn,1) > 0) utarray_push_back(cfg.hexv, &h);
  tpl_free(tn);

  find_bounds();
  draw_image();
  rc = 0;

 done:
  utarray_free(cfg.hexv);
  return rc;

}

static int control(struct vo *vo, uint32_t request, void *data)
{
    struct xvctx *ctx = vo->priv;
    switch (request) {
    case VOCTRL_GET_PANSCAN:
        return VO_TRUE;
    case VOCTRL_SET_PANSCAN:
        resize(vo);
        return VO_TRUE;
    case VOCTRL_SET_EQUALIZER: {
        vo->want_redraw = true;
        struct voctrl_set_equalizer_args *args = data;
        return xv_set_eq(vo, ctx->xv_port, args->name, args->value);
    }
    case VOCTRL_GET_EQUALIZER: {
        struct voctrl_get_equalizer_args *args = data;
        return xv_get_eq(vo, ctx->xv_port, args->name, args->valueptr);
    }
    case VOCTRL_REDRAW_FRAME:
        draw_image(vo, ctx->original_image);
        return true;
    }
    int events = 0;
    int r = vo_x11_control(vo, &events, request, data);
    if (events & (VO_EVENT_EXPOSE | VO_EVENT_RESIZE))
        resize(vo);
    vo_event(vo, events);
    return r;
}