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Fixes to RLE_4, RLE_8 and 16 bit BMP images

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BMP image handling now complete.
The only standard BMP feature not supported is transparency (alpha).
This commit is contained in:
Andrew Hannam 2013-04-03 14:58:35 +10:00
parent 64971549fd
commit 40e6d9c532
1 changed files with 16 additions and 14 deletions
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30
src/gdisp/image_bmp.c
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@ -35,16 +35,16 @@
#define GDISP_NEED_IMAGE_BMP_4 TRUE
#endif
#ifndef GDISP_NEED_IMAGE_BMP_4_RLE
#define GDISP_NEED_IMAGE_BMP_4_RLE FALSE // Currently Broken
#define GDISP_NEED_IMAGE_BMP_4_RLE TRUE
#endif
#ifndef GDISP_NEED_IMAGE_BMP_8
#define GDISP_NEED_IMAGE_BMP_8 TRUE
#endif
#ifndef GDISP_NEED_IMAGE_BMP_8_RLE
#define GDISP_NEED_IMAGE_BMP_8_RLE FALSE // Currently Broken
#define GDISP_NEED_IMAGE_BMP_8_RLE TRUE
#endif
#ifndef GDISP_NEED_IMAGE_BMP_16
#define GDISP_NEED_IMAGE_BMP_16 FALSE // Currently Broken
#define GDISP_NEED_IMAGE_BMP_16 TRUE
#endif
#ifndef GDISP_NEED_IMAGE_BMP_24
#define GDISP_NEED_IMAGE_BMP_24 TRUE
@ -89,7 +89,6 @@ static const uint8_t dwordOrder[4] = { 1, 2, 3, 4 };
#define CONVERT_FROM_WORD_LE(w) { if (!isWordLittleEndian()) w = ((((uint16_t)(w))>>8)|(((uint16_t)(w))<<8)); }
#define CONVERT_FROM_DWORD_LE(dw) { if (!isDWordLittleEndian()) dw = (((uint32_t)(((const uint8_t *)(&dw))[0]))|(((uint32_t)(((const uint8_t *)(&dw))[1]))<<8)|(((uint32_t)(((const uint8_t *)(&dw))[2]))<<16)|(((uint32_t)(((const uint8_t *)(&dw))[3]))<<24)); }
#endif
#define CONVERT_FROM_WORD_BE(w) { if (isWordLittleEndian()) w = ((((uint16_t)(w))>>8)|(((uint16_t)(w))<<8)); }
typedef struct gdispImagePrivate {
uint8_t bmpflags;
@ -372,9 +371,9 @@ gdispImageError gdispImageOpen_BMP(gdispImage *img) {
priv->maskalpha = 0;
} else if (priv->bitsperpixel == 16) {
priv->bmpflags |= BMP_COMP_MASK;
priv->maskred = 0x001F0000;
priv->maskgreen = 0x07E00000;
priv->maskblue = 0xF8000000;
priv->maskred = 0x7C00;
priv->maskgreen = 0x03E0;
priv->maskblue = 0x001F;
priv->maskalpha = 0;
} else if (priv->bitsperpixel == 32) {
priv->bmpflags |= BMP_COMP_MASK;
@ -389,11 +388,6 @@ gdispImageError gdispImageOpen_BMP(gdispImage *img) {
priv->shiftred = 0;
priv->shiftgreen = 0;
priv->shiftblue = 0;
if (priv->bitsperpixel == 16) {
priv->maskred >>= 16;
priv->maskgreen >>= 16;
priv->maskblue >>= 16;
}
if (priv->maskred) {
if (priv->maskred < 256)
for(adword = priv->maskred; adword < 128; priv->shiftred--, adword <<= 1);
@ -528,6 +522,10 @@ static coord_t getPixels(gdispImage *img, coord_t x) {
}
if (priv->rlerun) // Return if we have more run to do
return len;
if ((img->io.pos - priv->frame0pos)&1) { // Make sure we are on a word boundary
if (img->io.fns->read(&img->io, &b, 1) != 1)
return 0;
}
}
// We have finished the current run - read a new run
@ -618,6 +616,10 @@ static coord_t getPixels(gdispImage *img, coord_t x) {
}
if (priv->rlerun) // Return if we have more run to do
return len;
if ((img->io.pos - priv->frame0pos)&1) { // Make sure we are on a word boundary
if (img->io.fns->read(&img->io, &b, 1) != 1)
return 0;
}
}
// We have finished the current run - read a new run
@ -683,8 +685,8 @@ static coord_t getPixels(gdispImage *img, coord_t x) {
while(x < img->width && len <= BLIT_BUFFER_SIZE-2) {
if (img->io.fns->read(&img->io, &w, 4) != 4)
return 0;
CONVERT_FROM_WORD_BE(w[0]);
CONVERT_FROM_WORD_BE(w[1]);
CONVERT_FROM_WORD_LE(w[0]);
CONVERT_FROM_WORD_LE(w[1]);
if (priv->shiftred < 0)
r = (color_t)((w[0] & priv->maskred) << -priv->shiftred);
else