gecko-dev/lib/xlate/xlateimg.c

290 строки
10 KiB
C

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/*
** All the wonderful code for dealing with images
*/
#define JMC_INIT_PSIMGCB_ID
#include "xlate_i.h"
#include "libimg.h" /* Image Library public API. */
#include "il_util.h" /* Colormap/Colorspace API. */
/* Create and initialize the Image Library JMC callback interface.
Also create an IL_GroupContext for the current context. */
XP_Bool
psfe_init_image_callbacks(MWContext *cx)
{
IL_GroupContext *img_cx;
PSIMGCB* img_cb;
JMCException *exc = NULL;
if (!cx->img_cx) {
img_cb = PSIMGCBFactory_Create(&exc); /* JMC Module */
if (exc) {
JMC_DELETE_EXCEPTION(&exc); /* XXXM12N Should really return
exception */
return FALSE;
}
/* Create an Image Group Context. IL_NewGroupContext augments the
reference count for the JMC callback interface. The opaque argument
to IL_NewGroupContext is the Front End's display context, which will
be passed back to all the Image Library's FE callbacks. */
img_cx = IL_NewGroupContext((void*)cx, (IMGCBIF *)img_cb);
/* Attach the IL_GroupContext to the FE's display context. */
cx->img_cx = img_cx;
}
return TRUE;
}
/*****************************************************************************/
/* Image Library callbacks */
/*****************************************************************************/
#define HOWMANY(x, r) (((x) + ((r) - 1)) / (r))
#define ROUNDUP(x, r) (HOWMANY(x, r) * (r))
JMC_PUBLIC_API(void)
_PSIMGCB_init(struct PSIMGCB* self, JMCException* *exception)
{
/* Nothing to be done here. */
}
extern JMC_PUBLIC_API(void*)
_PSIMGCB_getBackwardCompatibleInterface(struct PSIMGCB* self,
const JMCInterfaceID* iid,
JMCException* *exception)
{
return NULL; /* Nothing to be done here. */
}
/**************************** Pixmap creation ********************************/
JMC_PUBLIC_API(void)
_PSIMGCB_NewPixmap(PSIMGCB* img_cb, jint op, void *dpy_cx, jint width,
jint height, IL_Pixmap *image, IL_Pixmap *mask)
{
uint8 img_depth, pixmap_depth;
NI_PixmapHeader *img_header = &image->header;
NI_PixmapHeader *mask_header = mask ? &mask->header : NULL;
MWContext *context = (MWContext *)dpy_cx; /* XXXM12N This should be the
FE's display context. */
/* Determine the depth of the image. */
pixmap_depth = context->color_space->pixmap_depth;
/* Override the image colorspace with the display colorspace. This
instructs the image library to decode to the display colorspace
instead of decoding to the image's source colorspace. */
IL_ReleaseColorSpace(img_header->color_space);
img_header->color_space = context->color_space;
IL_AddRefToColorSpace(img_header->color_space);
/* Ask the image library to scale to the requested dimensions.
Context-specific scaling, however, will be handled by the PSFE. */
img_header->width = width;
img_header->height = height;
if (mask) {
mask_header->width = width;
mask_header->height = height;
}
/* Compute the number of bytes per scan line for the image and mask,
and make sure it is quadlet aligned. */
img_depth = img_header->color_space->pixmap_depth;
XP_ASSERT(img_depth == pixmap_depth);
img_header->widthBytes = (img_header->width * img_depth + 7) / 8;
img_header->widthBytes = ROUNDUP(img_header->widthBytes, 4);
if (mask) {
mask_header->widthBytes = (mask_header->width + 7) / 8;
mask_header->widthBytes = ROUNDUP(mask_header->widthBytes, 4);
}
/* Allocate memory for the image bits, and for the mask bits (if
required.) */
image->bits = calloc(img_header->widthBytes * img_header->height, 1);
if (!image->bits)
return;
if (mask) {
mask->bits = calloc(mask_header->widthBytes * mask_header->height, 1);
if (!mask->bits) {
free(image->bits);
image->bits = NULL;
return;
}
}
}
/**************************** Pixmap update **********************************/
JMC_PUBLIC_API(void)
_PSIMGCB_UpdatePixmap(PSIMGCB* img_cb, jint op, void* dpy_cx,
IL_Pixmap* pixmap, jint x_offset, jint y_offset,
jint width, jint height)
{
}
/************************** Pixmap memory management *************************/
JMC_PUBLIC_API(void)
_PSIMGCB_ControlPixmapBits(PSIMGCB* img_cb, jint op, void* dpy_cx,
IL_Pixmap* pixmap, IL_PixmapControl message)
{
}
/**************************** Pixmap destruction *****************************/
/* XXXM12N The dpy_cx argument is not used in DestroyPixmap and should be
removed. */
JMC_PUBLIC_API(void)
_PSIMGCB_DestroyPixmap(PSIMGCB* img_cb, jint op, void* dpy_cx,
IL_Pixmap* pixmap)
{
/* Free the pixmap's bits. */
if (pixmap->bits) {
free(pixmap->bits);
pixmap->bits = NULL;
}
}
/**************************** Pixmap display *********************************/
JMC_PUBLIC_API(void)
_PSIMGCB_DisplayPixmap(PSIMGCB* img_cb, jint op, void* dpy_cx,
IL_Pixmap* image, IL_Pixmap* mask, jint x, jint y,
jint x_offset, jint y_offset, jint width, jint height,
jint req_w, jint req_h )
{
int32 img_x_offset, img_y_offset; /* Offset of image in drawable. */
int32 rect_x_offset, rect_y_offset; /* Offset of update rect in
drawable. */
NI_PixmapHeader *img_header = &image->header;
uint32 img_width = img_header->width; /* Image width. */
uint32 img_height = img_header->height; /* Image height. */
MWContext *context = (MWContext *)dpy_cx; /* XXX This should be the FE's
display context. */
XP_Bool tiling_required = FALSE;
/* Check for zero display area. */
if (width == 0 || height == 0)
return;
/* Perform context scaling. */
x *= context->convertPixX;
y *= context->convertPixY;
x_offset *= context->convertPixX;
y_offset *= context->convertPixY;
width *= context->convertPixX;
height *= context->convertPixY;
img_width *= context->convertPixX;
img_height *= context->convertPixY;
/* Determine whether tiling is required. */
if ((x_offset + width > img_width) || (y_offset + height > img_height))
tiling_required = TRUE;
/* Compute the offset into the drawable of the image origin. */
img_x_offset = x; /* + fe_drawable->x_origin; */
img_y_offset = y; /* + fe_drawable->y_origin; */
/* Check whether the image is ready to be displayed. */
if (!XP_CheckElementSpan(context, img_y_offset, img_height))
return;
/* Draw the image. */
xl_colorimage(context, x, y, width, height, image, mask);
}
/**************************** Icon dimensions ********************************/
JMC_PUBLIC_API(void)
_PSIMGCB_GetIconDimensions(PSIMGCB* img_cb, jint op, void* dpy_cx, int* width,
int* height, jint icon_number)
{
/* Call the screen FE to get the icon dimensions in pixels. */
FE_GetPSIconDimensions(icon_number, width, height);
}
/**************************** Icon display ***********************************/
JMC_PUBLIC_API(void)
_PSIMGCB_DisplayIcon(PSIMGCB* img_cb, jint op, void* dpy_cx, jint x, jint y,
jint icon_number)
{
int width; /* Width of the icon in context scaled coordinates. */
int height; /* Height of the icon in context scaled coordinates. */
int img_depth; /* Depth of the image. */
MWContext *context = (MWContext *)dpy_cx;
IL_Pixmap image; /* Image pixmap. */
NI_PixmapHeader *img_header = &image.header;
/* Call the screen FE to get the icon dimensions in pixels. */
FE_GetPSIconDimensions(icon_number, &width, &height);
img_header->width = (int32)width;
img_header->height = (int32)height;
/* Apply context scaling to the dimensions. */
width *= context->convertPixX;
height *= context->convertPixY;
/* Check whether we are ready to display the icon. */
if (!XP_CheckElementSpan(context, y, height))
return;
/* Don't attempt to display the icon if either dimension is zero. */
if (!width || !height)
return;
/* Get ourselves a colorspace. */
img_header->color_space = context->color_space;
IL_AddRefToColorSpace(img_header->color_space);
/* Allocate bits for the icon. We don't cache icons created for the
purpose of printing. */
img_depth = img_header->color_space->pixmap_depth;
img_header->widthBytes = (img_header->width * img_depth + 7) / 8;
img_header->widthBytes = ROUNDUP(img_header->widthBytes, 4);
/* Allocate memory for the image bits. */
image.bits = calloc(img_header->widthBytes * img_header->height, 1);
if (!image.bits) {
IL_ReleaseColorSpace(img_header->color_space);
return;
}
/* Get the icon data from the screen FE and draw the icon. */
if (FE_GetPSIconData(icon_number, &image, NULL))
xl_colorimage(context, x, y, width, height, &image, NULL);
/* Clean up. */
free(image.bits);
IL_ReleaseColorSpace(img_header->color_space);
}
/*****************************************************************************/
/* End of Image Library callbacks */
/*****************************************************************************/