/**
* Read pixels from 565 format.
*
* \param x x-coordinate of the first pixel
* \param y y-coordinate of the first pixel
* \param width x-dimension of the pixel rectangle
* \param height y-dimension of the pixel rectangle
* \param format format of the pixel data
* \param type data type of the pixel data
* \param pixels pixel data
* \param info hardware buffer info
*/
static void
_readpixels565 (GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
GLvoid *pixels,
GrLfbInfo_t *info)
{
const GLint srcStride = info->strideInBytes / 2;
const GLushort *src = (const GLushort *)info->lfbPtr + y * srcStride + x;
if (format == GL_RGB && type == GL_UNSIGNED_BYTE) {
/* convert 5R6G5B into 8R8G8B */
GLint row, col;
GLint dstStride = image_stride(&ctx_pack, width, 3);
GLubyte *dst = (GLubyte *)image_address(&ctx_pack, pixels, width, height, 3, 0, 0, 0);
for (row = 0; row < height; row++) {
GLubyte *d = dst;
for (col = 0; col < width; col++) {
const GLushort pixel = src[col];
GLuint r = (pixel & 0xf800) >> 8;
GLuint g = (pixel & 0x07e0) >> 3;
GLuint b = (pixel & 0x001f) << 3;
*d++ = r | (r >> 5);
*d++ = g | (g >> 6);
*d++ = b | (b >> 5);
}
dst += dstStride;
src -= srcStride;
}
} else if (format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
void *
tc_encode (const PACKING *unpack,
int dst_width, int dst_height,
void *dst,
GLenum dst_format,
int src_width, int src_height,
const GLvoid *src,
GLenum src_format,
GLenum src_type)
{
TC_ENCODER encoder = NULL;
int srcStrideInBytes;
int srcTexelBytes;
int destRowStride;
int size;
if (h == NULL) {
return NULL;
}
if ((src_format != GL_RGB && src_format != GL_RGBA) || (src_type != GL_UNSIGNED_BYTE)) {
return NULL;
}
srcTexelBytes = (src_format == GL_RGB) ? 3 : 4;
switch (dst_format) {
case GL_COMPRESSED_RGB_FXT1_3DFX:
case GL_COMPRESSED_RGBA_FXT1_3DFX:
encoder = fxt1_encode;
break;
case GL_RGB_S3TC:
case GL_RGB4_S3TC:
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
encoder = dxt1_rgb_encode;
break;
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
encoder = dxt1_rgba_encode;
break;
case GL_RGBA_S3TC:
case GL_RGBA4_S3TC:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
encoder = dxt3_rgba_encode;
break;
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
encoder = dxt5_rgba_encode;
break;
default:
return NULL;
}
srcStrideInBytes = image_stride(unpack, src_width, srcTexelBytes);
destRowStride = tc_stride(dst_format, dst_width);
size = tc_size(dst_format, dst_width, dst_height);
if (dst == NULL) {
dst = malloc(size);
}
if (dst == NULL) {
return NULL;
}
encoder(src_width, src_height, srcTexelBytes, src, srcStrideInBytes, dst, destRowStride);
return dst;
}
