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https://github.com/python-pillow/Pillow.git
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301 lines
7.9 KiB
C
301 lines
7.9 KiB
C
/*
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* The Python Imaging Library
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* $Id$
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*
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* imaging display object for Windows
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*
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* history:
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* 1996-05-12 fl Created
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* 1996-05-17 fl Up and running
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* 1996-05-21 fl Added palette stuff
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* 1996-05-26 fl Added query palette and mode inquery
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* 1997-09-21 fl Added draw primitive
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* 1998-01-20 fl Use StretchDIBits instead of StretchBlt
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* 1998-12-30 fl Plugged a resource leak in DeleteDIB (from Roger Burnham)
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*
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* Copyright (c) Secret Labs AB 1997-2001.
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* Copyright (c) Fredrik Lundh 1996.
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*
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* See the README file for information on usage and redistribution.
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*/
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#include "Imaging.h"
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#ifdef _WIN32
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#include "ImDib.h"
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char*
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ImagingGetModeDIB(int size_out[2])
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{
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/* Get device characteristics */
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HDC dc;
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char* mode;
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dc = CreateCompatibleDC(NULL);
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mode = "P";
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if (!(GetDeviceCaps(dc, RASTERCAPS) & RC_PALETTE)) {
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mode = "RGB";
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if (GetDeviceCaps(dc, BITSPIXEL) == 1)
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mode = "1";
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}
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if (size_out) {
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size_out[0] = GetDeviceCaps(dc, HORZRES);
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size_out[1] = GetDeviceCaps(dc, VERTRES);
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}
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DeleteDC(dc);
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return mode;
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}
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ImagingDIB
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ImagingNewDIB(const char *mode, int xsize, int ysize)
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{
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/* Create a Windows bitmap */
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ImagingDIB dib;
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RGBQUAD *palette;
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int i;
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/* Check mode */
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if (strcmp(mode, "1") != 0 && strcmp(mode, "L") != 0 &&
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strcmp(mode, "RGB") != 0)
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return (ImagingDIB) ImagingError_ModeError();
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/* Create DIB context and info header */
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/* malloc check ok, small constant allocation */
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dib = (ImagingDIB) malloc(sizeof(*dib));
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if (!dib)
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return (ImagingDIB) ImagingError_MemoryError();
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/* malloc check ok, small constant allocation */
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dib->info = (BITMAPINFO*) malloc(sizeof(BITMAPINFOHEADER) +
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256 * sizeof(RGBQUAD));
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if (!dib->info) {
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free(dib);
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return (ImagingDIB) ImagingError_MemoryError();
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}
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memset(dib->info, 0, sizeof(BITMAPINFOHEADER));
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dib->info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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dib->info->bmiHeader.biWidth = xsize;
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dib->info->bmiHeader.biHeight = ysize;
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dib->info->bmiHeader.biPlanes = 1;
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dib->info->bmiHeader.biBitCount = strlen(mode)*8;
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dib->info->bmiHeader.biCompression = BI_RGB;
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/* Create DIB */
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dib->dc = CreateCompatibleDC(NULL);
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if (!dib->dc) {
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free(dib->info);
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free(dib);
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return (ImagingDIB) ImagingError_MemoryError();
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}
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dib->bitmap = CreateDIBSection(dib->dc, dib->info, DIB_RGB_COLORS,
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&dib->bits, NULL, 0);
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if (!dib->bitmap) {
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free(dib->info);
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free(dib);
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return (ImagingDIB) ImagingError_MemoryError();
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}
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strcpy(dib->mode, mode);
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dib->xsize = xsize;
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dib->ysize = ysize;
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dib->pixelsize = strlen(mode);
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dib->linesize = (xsize * dib->pixelsize + 3) & -4;
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if (dib->pixelsize == 1)
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dib->pack = dib->unpack = (ImagingShuffler) memcpy;
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else {
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dib->pack = ImagingPackBGR;
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dib->unpack = ImagingPackBGR;
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}
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/* Bind the DIB to the device context */
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dib->old_bitmap = SelectObject(dib->dc, dib->bitmap);
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palette = dib->info->bmiColors;
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/* Bind a palette to it as well (only required for 8-bit DIBs) */
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if (dib->pixelsize == 1) {
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for (i = 0; i < 256; i++) {
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palette[i].rgbRed =
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palette[i].rgbGreen =
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palette[i].rgbBlue = i;
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palette[i].rgbReserved = 0;
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}
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SetDIBColorTable(dib->dc, 0, 256, palette);
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}
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/* Create an associated palette (for 8-bit displays only) */
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if (strcmp(ImagingGetModeDIB(NULL), "P") == 0) {
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char palbuf[sizeof(LOGPALETTE)+256*sizeof(PALETTEENTRY)];
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LPLOGPALETTE pal = (LPLOGPALETTE) palbuf;
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int i, r, g, b;
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/* Load system palette */
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pal->palVersion = 0x300;
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pal->palNumEntries = 256;
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GetSystemPaletteEntries(dib->dc, 0, 256, pal->palPalEntry);
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if (strcmp(mode, "L") == 0) {
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/* Greyscale DIB. Fill all 236 slots with a greyscale ramp
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* (this is usually overkill on Windows since VGA only offers
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* 6 bits greyscale resolution). Ignore the slots already
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* allocated by Windows */
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i = 10;
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for (r = 0; r < 236; r++) {
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pal->palPalEntry[i].peRed =
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pal->palPalEntry[i].peGreen =
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pal->palPalEntry[i].peBlue = i;
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i++;
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}
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dib->palette = CreatePalette(pal);
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} else if (strcmp(mode, "RGB") == 0) {
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#ifdef CUBE216
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/* Colour DIB. Create a 6x6x6 colour cube (216 entries) and
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* add 20 extra greylevels for best result with greyscale
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* images. */
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i = 10;
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for (r = 0; r < 256; r += 51)
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for (g = 0; g < 256; g += 51)
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for (b = 0; b < 256; b += 51) {
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pal->palPalEntry[i].peRed = r;
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pal->palPalEntry[i].peGreen = g;
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pal->palPalEntry[i].peBlue = b;
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i++;
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}
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for (r = 1; r < 22-1; r++) {
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/* Black and white are already provided by the cube. */
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pal->palPalEntry[i].peRed =
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pal->palPalEntry[i].peGreen =
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pal->palPalEntry[i].peBlue = r * 255 / (22-1);
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i++;
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}
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#else
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/* Colour DIB. Alternate palette. */
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i = 10;
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for (r = 0; r < 256; r += 37)
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for (g = 0; g < 256; g += 32)
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for (b = 0; b < 256; b += 64) {
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pal->palPalEntry[i].peRed = r;
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pal->palPalEntry[i].peGreen = g;
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pal->palPalEntry[i].peBlue = b;
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i++;
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}
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#endif
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dib->palette = CreatePalette(pal);
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}
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}
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return dib;
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}
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void
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ImagingPasteDIB(ImagingDIB dib, Imaging im, int xy[4])
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{
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/* Paste image data into a bitmap */
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/* FIXME: check size! */
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int y;
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for (y = 0; y < im->ysize; y++)
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dib->pack(dib->bits + dib->linesize*(dib->ysize-(xy[1]+y)-1) +
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xy[0]*dib->pixelsize, im->image[y], im->xsize);
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}
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void
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ImagingExposeDIB(ImagingDIB dib, void *dc)
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{
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/* Copy bitmap to display */
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if (dib->palette != 0)
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SelectPalette((HDC) dc, dib->palette, FALSE);
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BitBlt((HDC) dc, 0, 0, dib->xsize, dib->ysize, dib->dc, 0, 0, SRCCOPY);
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}
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void
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ImagingDrawDIB(ImagingDIB dib, void *dc, int dst[4], int src[4])
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{
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/* Copy bitmap to printer/display */
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if (GetDeviceCaps((HDC) dc, RASTERCAPS) & RC_STRETCHDIB) {
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/* stretchdib (printers) */
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StretchDIBits((HDC) dc, dst[0], dst[1], dst[2]-dst[0], dst[3]-dst[1],
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src[0], src[1], src[2]-src[0], src[3]-src[1], dib->bits,
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dib->info, DIB_RGB_COLORS, SRCCOPY);
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} else {
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/* stretchblt (displays) */
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if (dib->palette != 0)
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SelectPalette((HDC) dc, dib->palette, FALSE);
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StretchBlt((HDC) dc, dst[0], dst[1], dst[2]-dst[0], dst[3]-dst[1],
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dib->dc, src[0], src[1], src[2]-src[0], src[3]-src[1],
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SRCCOPY);
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}
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}
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int
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ImagingQueryPaletteDIB(ImagingDIB dib, void *dc)
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{
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/* Install bitmap palette */
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int n;
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if (dib->palette != 0) {
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/* Realize associated palette */
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HPALETTE now = SelectPalette((HDC) dc, dib->palette, FALSE);
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n = RealizePalette((HDC) dc);
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/* Restore palette */
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SelectPalette((HDC) dc, now, FALSE);
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} else
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n = 0;
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return n; /* number of colours that was changed */
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}
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void
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ImagingDeleteDIB(ImagingDIB dib)
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{
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/* Clean up */
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if (dib->palette)
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DeleteObject(dib->palette);
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if (dib->bitmap) {
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SelectObject(dib->dc, dib->old_bitmap);
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DeleteObject(dib->bitmap);
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}
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if (dib->dc)
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DeleteDC(dib->dc);
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free(dib->info);
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}
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#endif /* _WIN32 */
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