New file (image.c) for Image consolidation:
(COLOR_TABLE_SUPPORT): New define to control whether color table support is available (X only). (Bitmap_Record): Common name for x_bitmap_record, w32_bitmap_record, and mac_bitmap_record. (XImagePtr): Common name for pointer to XImage or equivalent. (XImagePtr_or_DC): New type to simplify code sharing; equivalent to XImagePtr on X+MAC, and to HDC on W32. (GET_PIXEL): Wrapper for XGetPixel or equivalent. (NO_PIXMAP): Common name for "None" or equivalent. (PNG_BG_COLOR_SHIFT): Bits to shift PNG background colors. (RGB_PIXEL_COLOR): Common type for an integer "pixel color" value. (PIX_MASK_RETAIN, PIX_MASK_DRAW): Portability macros (from macfns.c). (FRAME_X_VISUAL, x_defined_color, DefaultDepthOfScreen): Define with suitable equivalents on W32 and MAC for code sharing. (XDrawLine): Define on MAC for code sharing. (Destroy_Image, Free_Pixmap): Wrappers for code sharing. (IF_LIB_AVAILABLE): Macro to simplify code sharing. (Vx_bitmap_file_path, Vimage_cache_eviction_delay) (x_bitmap_height, x_bitmap_width, x_bitmap_pixmap) (x_reference_bitmap, x_create_bitmap_from_data) (x_create_bitmap_from_file, x_destroy_bitmap) (x_destroy_all_bitmaps, x_create_bitmap_mask) (XGetImage, XPutPixel, XGetPixel, XDestroyImage) (QCascent, QCmargin, QCrelief, QCconversion, QCcolor_symbols) (QCheuristic_mask, QCindex, QCmatrix, QCcolor_adjustment, QCmask) (Qlaplace, Qemboss, Qedge_detection, Qheuristic, Qcenter) (define_image_type, lookup_image_type, valid_image_p) (image_error, enum image_value_type, struct image_keyword) (parse_image_spec, image_spec_value, Fimage_size, Fimage_mask_p) (make_image, free_image, prepare_image_for_display, image_ascent) (four_corners_best, image_background, image_background_transparent) (x_clear_image_1, x_clear_image, x_alloc_image_color) (make_image_cache, free_image_cache, clear_image_cache) (Fclear_image_cache, postprocess_image, lookup_image, cache_image) (forall_images_in_image_cache, x_create_x_image_and_pixmap) (x_destroy_x_image, x_put_x_image, x_find_image_file, slurp_file) (find_image_fsspec, image_load_qt_1, image_load_quicktime) (init_image_func_pointer, image_load_quartz2d) (struct ct_color, init_color_table, free_color_table) (lookup_rgb_color, lookup_pixel_color, colors_in_color_table) (cross_disabled_images, x_to_xcolors, x_from_xcolors) (x_detect_edges, x_emboss, x_laplace, x_edge_detection) (x_disable_image, x_build_heuristic_mask) (XBM support, XPM support, PBM support, PNG support, JPEG support) (TIFF support, GIF support, Ghostscript support): Consolidate image code from xfns.c, w32fns.c, and macfns.c. (syms_of_image): Consolidate image related symbol setup here. (init_image): Consolidate image related initializations here.
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