{
int width = ximg->info.bmiHeader.biWidth;
int height = ximg->info.bmiHeader.biHeight;
- int rowbytes = width * 3;
unsigned char * pixel;
- /* Don't support putting pixels in images with palettes. */
- xassert (ximg->info.bmiHeader.biBitCount == 24);
-
- /* Ensure scanlines are aligned on 4 byte boundaries. */
- if (rowbytes % 4)
- rowbytes += 4 - (rowbytes % 4);
-
- pixel = ximg->data + y * rowbytes + x * 3;
- /* Windows bitmaps are in BGR order. */
- *pixel = GetBValue (color);
- *(pixel + 1) = GetGValue (color);
- *(pixel + 2) = GetRValue (color);
+ /* True color images. */
+ if (ximg->info.bmiHeader.biBitCount == 24)
+ {
+ int rowbytes = width * 3;
+ /* Ensure scanlines are aligned on 4 byte boundaries. */
+ if (rowbytes % 4)
+ rowbytes += 4 - (rowbytes % 4);
+
+ pixel = ximg->data + y * rowbytes + x * 3;
+ /* Windows bitmaps are in BGR order. */
+ *pixel = GetBValue (color);
+ *(pixel + 1) = GetGValue (color);
+ *(pixel + 2) = GetRValue (color);
+ }
+ /* Monochrome images. */
+ else if (ximg->info.bmiHeader.biBitCount == 1)
+ {
+ int rowbytes = width / 8;
+ /* Ensure scanlines are aligned on 4 byte boundaries. */
+ if (rowbytes % 4)
+ rowbytes += 4 - (rowbytes % 4);
+ pixel = ximg->data + y * rowbytes + x / 8;
+ /* Filter out palette info. */
+ if (color & 0x00ffffff)
+ *pixel = *pixel | (1 << x % 8);
+ else
+ *pixel = *pixel & ~(1 << x % 8);
+ }
+ else
+ image_error ("XPutPixel: palette image not supported.", NULL, Qnil);
}
-
/* Create IMG->pixmap from an array COLORS of XColor structures, whose
RGB members are set. F is the frame on which this all happens.
COLORS will be freed; an existing IMG->pixmap will be freed, too. */
image_background_transparent (img, f, img_dc);
/* Put mask_img into img->mask. */
- x_destroy_x_image (mask_img);
+ x_destroy_x_image ((XImage *)mask_img);
SelectObject (img_dc, prev);
DeleteDC (img_dc);
{
struct image_keyword fmt[PNG_LAST];
bcopy (png_format, fmt, sizeof fmt);
-
+
if (!parse_image_spec (object, fmt, PNG_LAST, Qpng))
return 0;
if (length > tbr->len - tbr->index)
png_error (png_ptr, "Read error");
-
+
bcopy (tbr->bytes + tbr->index, data, length);
tbr->index = tbr->index + length;
}
png_info *info_ptr = NULL, *end_info = NULL;
FILE *volatile fp = NULL;
png_byte sig[8];
- png_byte *volatile pixels = NULL;
- png_byte **volatile rows = NULL;
+ png_byte * volatile pixels = NULL;
+ png_byte ** volatile rows = NULL;
png_uint_32 width, height;
int bit_depth, color_type, interlace_type;
png_byte channels;
png_uint_32 row_bytes;
int transparent_p;
- char *gamma_str;
double screen_gamma, image_gamma;
int intent;
struct png_memory_storage tbr; /* Data to be read */
{
file = x_find_image_file (specified_file);
if (!STRINGP (file))
- {
- image_error ("Cannot find image file `%s'", specified_file, Qnil);
- UNGCPRO;
- return 0;
- }
+ {
+ image_error ("Cannot find image file `%s'", specified_file, Qnil);
+ UNGCPRO;
+ return 0;
+ }
/* Open the image file. */
fp = fopen (SDATA (file), "rb");
if (!fp)
- {
- image_error ("Cannot open image file `%s'", file, Qnil);
- UNGCPRO;
- fclose (fp);
- return 0;
- }
+ {
+ image_error ("Cannot open image file `%s'", file, Qnil);
+ UNGCPRO;
+ fclose (fp);
+ return 0;
+ }
/* Check PNG signature. */
if (fread (sig, 1, sizeof sig, fp) != sizeof sig
- || !png_check_sig (sig, sizeof sig))
- {
- image_error ("Not a PNG file:` %s'", file, Qnil);
- UNGCPRO;
- fclose (fp);
- return 0;
- }
+ || !png_check_sig (sig, sizeof sig))
+ {
+ image_error ("Not a PNG file: `%s'", file, Qnil);
+ UNGCPRO;
+ fclose (fp);
+ return 0;
+ }
}
else
{
png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
&interlace_type, NULL, NULL);
- /* If image contains simply transparency data, we prefer to
+ /* If image contains simply transparency data, we prefer to
construct a clipping mask. */
if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS))
transparent_p = 1;
else
transparent_p = 0;
- /* This function is easier to write if we only have to handle
+ /* This function is easier to write if we only have to handle
one data format: RGB or RGBA with 8 bits per channel. Let's
transform other formats into that format. */
png_set_expand (png_ptr);
/* Convert grayscale images to RGB. */
- if (color_type == PNG_COLOR_TYPE_GRAY
+ if (color_type == PNG_COLOR_TYPE_GRAY
|| color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb (png_ptr);
- /* The value 2.2 is a guess for PC monitors from PNG example.c. */
- gamma_str = getenv ("SCREEN_GAMMA");
- screen_gamma = gamma_str ? atof (gamma_str) : 2.2;
+ screen_gamma = (f->gamma ? 1 / f->gamma / 0.45455 : 2.2);
+#if 0 /* Avoid double gamma correction for PNG images. */
/* Tell the PNG lib to handle gamma correction for us. */
-
#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
if (png_get_sRGB (png_ptr, info_ptr, &intent))
- /* There is a special chunk in the image specifying the gamma. */
- png_set_sRGB (png_ptr, info_ptr, intent);
+ /* The libpng documentation says this is right in this case. */
+ png_set_gamma (png_ptr, screen_gamma, 0.45455);
else
#endif
if (png_get_gAMA (png_ptr, info_ptr, &image_gamma))
/* Image contains gamma information. */
png_set_gamma (png_ptr, screen_gamma, image_gamma);
else
- /* Use a default of 0.5 for the image gamma. */
- png_set_gamma (png_ptr, screen_gamma, 0.5);
+ /* Use the standard default for the image gamma. */
+ png_set_gamma (png_ptr, screen_gamma, 0.45455);
+#endif /* if 0 */
/* Handle alpha channel by combining the image with a background
color. Do this only if a real alpha channel is supplied. For
simple transparency, we prefer a clipping mask. */
if (!transparent_p)
{
- png_color_16 *image_background;
+ png_color_16 *image_bg;
Lisp_Object specified_bg
= image_spec_value (img->spec, QCbackground, NULL);
-
if (STRINGP (specified_bg))
/* The user specified `:background', use that. */
{
png_color_16 user_bg;
bzero (&user_bg, sizeof user_bg);
- user_bg.red = color.red;
- user_bg.green = color.green;
- user_bg.blue = color.blue;
+ user_bg.red = 256 * GetRValue (color);
+ user_bg.green = 256 * GetGValue (color);
+ user_bg.blue = 256 * GetBValue (color);
png_set_background (png_ptr, &user_bg,
PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
}
}
- else if (png_get_bKGD (png_ptr, info_ptr, &image_background))
- /* Image contains a background color with which to
+ else if (png_get_bKGD (png_ptr, info_ptr, &image_bg))
+ /* Image contains a background color with which to
combine the image. */
- png_set_background (png_ptr, image_background,
+ png_set_background (png_ptr, image_bg,
PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
else
{
/* Image does not contain a background color with which
- to combine the image data via an alpha channel. Use
+ to combine the image data via an alpha channel. Use
the frame's background instead. */
- XColor color;
- Colormap cmap;
+ COLORREF color;
png_color_16 frame_background;
+ color = FRAME_BACKGROUND_PIXEL (f);
+#if 0 /* TODO : Colormap support. */
+ Colormap cmap;
cmap = FRAME_X_COLORMAP (f);
- color.pixel = FRAME_BACKGROUND_PIXEL (f);
x_query_color (f, &color);
+#endif
bzero (&frame_background, sizeof frame_background);
- frame_background.red = color.red;
- frame_background.green = color.green;
- frame_background.blue = color.blue;
+ frame_background.red = 256 * GetRValue (color);
+ frame_background.green = 256 * GetGValue (color);
+ frame_background.blue = 256 * GetBValue (color);
png_set_background (png_ptr, &frame_background,
PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
fclose (fp);
fp = NULL;
}
-
+
/* Create the X image and pixmap. */
if (!x_create_x_image_and_pixmap (f, width, height, 0, &ximg,
&img->pixmap))
goto error;
-
+
/* Create an image and pixmap serving as mask if the PNG image
contains an alpha channel. */
if (channels == 4
&mask_img, &img->mask))
{
x_destroy_x_image (ximg);
- XFreePixmap (FRAME_W32_DISPLAY (f), img->pixmap);
+ DeleteObject (img->pixmap);
img->pixmap = 0;
goto error;
}
-
/* Fill the X image and mask from PNG data. */
+#if 0 /* TODO: Color tables. */
init_color_table ();
+#endif
for (y = 0; y < height; ++y)
{
{
unsigned r, g, b;
- r = *p++ << 8;
- g = *p++ << 8;
- b = *p++ << 8;
+ r = *p++;
+ g = *p++;
+ b = *p++;
+#if 0 /* TODO: Color tables. */
XPutPixel (ximg, x, y, lookup_rgb_color (f, r, g, b));
-
+#else
+ XPutPixel (ximg, x, y, PALETTERGB (r, g, b));
+#endif
/* An alpha channel, aka mask channel, associates variable
- transparency with an image. Where other image formats
- support binary transparency---fully transparent or fully
+ transparency with an image. Where other image formats
+ support binary transparency---fully transparent or fully
opaque---PNG allows up to 254 levels of partial transparency.
The PNG library implements partial transparency by combining
the image with a specified background color.
I'm not sure how to handle this here nicely: because the
background on which the image is displayed may change, for
- real alpha channel support, it would be necessary to create
- a new image for each possible background.
+ real alpha channel support, it would be necessary to create
+ a new image for each possible background.
What I'm doing now is that a mask is created if we have
boolean transparency information. Otherwise I'm using
png_color_16 *bg;
if (png_get_bKGD (png_ptr, info_ptr, &bg))
{
+#if 0 /* TODO: Color tables. */
img->background = lookup_rgb_color (f, bg->red, bg->green, bg->blue);
+#else
+ img->background = PALETTERGB (bg->red / 256, bg->green / 256,
+ bg->blue / 256);
+#endif
img->background_valid = 1;
}
}
+#if 0 /* TODO: Color tables. */
/* Remember colors allocated for this image. */
img->colors = colors_in_color_table (&img->ncolors);
free_color_table ();
+#endif
/* Clean up. */
png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);
projects / emacs.git / commitdiff