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(svn r17943) -Change: use 24bpp BMP format instead of 32bpp for screenshots. Saves space and is supported by more image viewers

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pull/155/head
smatz 15 years ago
parent f37f2d037c
commit 2d008c9cfd
1 changed files with 83 additions and 56 deletions
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139
src/screenshot.cpp
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@ -46,6 +46,7 @@ struct ScreenshotFormat {
#pragma pack(push, 1)
#endif
/** BMP File Header (stored in little endian) */
struct BitmapFileHeader {
uint16 type;
uint32 size;
@ -58,6 +59,7 @@ assert_compile(sizeof(BitmapFileHeader) == 14);
#pragma pack(pop)
#endif
/** BMP Info Header (stored in little endian) */
struct BitmapInfoHeader {
uint32 size;
int32 width, height;
@ -66,47 +68,63 @@ struct BitmapInfoHeader {
};
assert_compile(sizeof(BitmapInfoHeader) == 40);
/** Format of palette data in BMP header */
struct RgbQuad {
byte blue, green, red, reserved;
};
assert_compile(sizeof(RgbQuad) == 4);
/* generic .BMP writer */
/** Pixel data in 24bpp BMP */
struct RgbTriplet {
byte b, g, r;
};
assert_compile(sizeof(RgbTriplet) == 3);
/**
* Generic .BMP writer
* @param name file name including extension
* @param callb callback used for gathering rendered image
* @param userdata parameters forwarded to #callb
* @param w width in pixels
* @param h height in pixels
* @param pixelformat bits per pixel
* @param paletter colour paletter (for 8bpp mode)
* @return was everything ok?
*/
static bool MakeBmpImage(char *name, ScreenshotCallback *callb, void *userdata, uint w, uint h, int pixelformat, const Colour *palette)
{
BitmapFileHeader bfh;
BitmapInfoHeader bih;
RgbQuad rq[256];
FILE *f;
uint i, padw;
uint n, maxlines;
uint pal_size = 0;
uint bpp = pixelformat / 8;
/* only implemented for 8bit and 32bit images so far. */
if (pixelformat != 8 && pixelformat != 32) return false;
uint bpp; // bytes per pixel
switch (pixelformat) {
case 8: bpp = 1; break;
/* 32bpp mode is saved as 24bpp BMP */
case 32: bpp = 3; break;
/* Only implemented for 8bit and 32bit images so far */
default: return false;
}
f = fopen(name, "wb");
FILE *f = fopen(name, "wb");
if (f == NULL) return false;
/* each scanline must be aligned on a 32bit boundary */
padw = w;
if (pixelformat == 8) padw = Align(padw, 4);
/* Each scanline must be aligned on a 32bit boundary */
uint bytewidth = Align(w * bpp, 4); // bytes per line in file
if (pixelformat == 8) pal_size = sizeof(RgbQuad) * 256;
/* Size of palette. Only present for 8bpp mode */
uint pal_size = pixelformat == 8 ? sizeof(RgbQuad) * 256 : 0;
/* setup the file header */
/* Setup the file header */
BitmapFileHeader bfh;
bfh.type = TO_LE16('MB');
bfh.size = TO_LE32(sizeof(bfh) + sizeof(bih) + pal_size + padw * h * bpp);
bfh.size = TO_LE32(sizeof(BitmapFileHeader) + sizeof(BitmapInfoHeader) + pal_size + bytewidth * h);
bfh.reserved = 0;
bfh.off_bits = TO_LE32(sizeof(bfh) + sizeof(bih) + pal_size);
bfh.off_bits = TO_LE32(sizeof(BitmapFileHeader) + sizeof(BitmapInfoHeader) + pal_size);
/* setup the info header */
/* Setup the info header */
BitmapInfoHeader bih;
bih.size = TO_LE32(sizeof(BitmapInfoHeader));
bih.width = TO_LE32(w);
bih.height = TO_LE32(h);
bih.planes = TO_LE16(1);
bih.bitcount = TO_LE16(pixelformat);
bih.bitcount = TO_LE16(bpp * 8);
bih.compression = 0;
bih.sizeimage = 0;
bih.xpels = 0;
@ -114,57 +132,66 @@ static bool MakeBmpImage(char *name, ScreenshotCallback *callb, void *userdata,
bih.clrused = 0;
bih.clrimp = 0;
/* Write file header and info header */
if (fwrite(&bfh, sizeof(bfh), 1, f) != 1 || fwrite(&bih, sizeof(bih), 1, f) != 1) {
fclose(f);
return false;
}
if (pixelformat == 8) {
/* convert the palette to the windows format */
for (i = 0; i != 256; i++) {
/* Convert the palette to the windows format */
RgbQuad rq[256];
for (uint i = 0; i < 256; i++) {
rq[i].red = palette[i].r;
rq[i].green = palette[i].g;
rq[i].blue = palette[i].b;
rq[i].reserved = 0;
}
/* Write the palette */
if (fwrite(rq, sizeof(rq), 1, f) != 1) {
fclose(f);
return false;
}
}
/* write file header and info header and palette */
if (fwrite(&bfh, sizeof(bfh), 1, f) != 1 || fwrite(&bih, sizeof(bih), 1, f) != 1) {
fclose(f);
return false;
}
if (pixelformat == 8 && fwrite(rq, sizeof(rq), 1, f) != 1) {
fclose(f);
return false;
}
/* use by default 64k temp memory */
maxlines = Clamp(65536 / padw, 16, 128);
/* Try to use 64k of memory, store between 16 and 128 lines */
uint maxlines = Clamp(65536 / (w * pixelformat / 8), 16, 128); // number of lines per iteration
/* now generate the bitmap bits */
uint8 *buff = CallocT<uint8>(padw * maxlines * bpp); // by default generate 128 lines at a time.
uint8 *buff = MallocT<uint8>(maxlines * w * pixelformat / 8); // buffer which is rendered to
uint8 *line = AllocaM(uint8, bytewidth); // one line, stored to file
memset(line, 0, bytewidth);
/* start at the bottom, since bitmaps are stored bottom up. */
/* Start at the bottom, since bitmaps are stored bottom up */
do {
/* determine # lines */
n = min(h, maxlines);
uint n = min(h, maxlines);
h -= n;
/* render the pixels */
callb(userdata, buff, h, padw, n);
#if TTD_ENDIAN == TTD_BIG_ENDIAN
if (pixelformat == 32) {
/* Data stored in BMP are always little endian,
* but we have big endian data in buffer */
uint32 *buff32 = (uint32 *)buff;
for (i = 0; i < padw * n; i++) buff32[i] = BSWAP32(buff32[i]);
}
#endif /* TTD_ENDIAN == TTD_BIG_ENDIAN */
/* write each line */
while (n)
if (fwrite(buff + (--n) * padw * bpp, padw * bpp, 1, f) != 1) {
/* Render the pixels */
callb(userdata, buff, h, w, n);
/* Write each line */
while (n-- != 0) {
if (pixelformat == 8) {
/* Move to 'line', leave last few pixels in line zeroed */
memcpy(line, buff + n * w, w);
} else {
/* Convert from 'native' 32bpp to BMP-like 24bpp.
* Works for both big and little endian machines */
Colour *src = ((Colour *)buff) + n * w;
RgbTriplet *dst = (RgbTriplet *)line;
for (uint i = 0; i < w; i++) {
dst[i].r = src[i].r;
dst[i].g = src[i].g;
dst[i].b = src[i].b;
}
}
/* Write to file */
if (fwrite(line, bytewidth, 1, f) != 1) {
free(buff);
fclose(f);
return false;
}
}
} while (h != 0);
free(buff);

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