/**
* 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 Dirty::swapImagePixels(Image* image)
{
RowsList::iterator row_it = m_rows.begin();
RowsList::iterator row_end = m_rows.end();
for (; row_it != row_end; ++row_it) {
Row* row = *row_it;
ColsList::iterator col_it = (*row_it)->cols.begin();
ColsList::iterator col_end = (*row_it)->cols.end();
for (; col_it != col_end; ++col_it) {
Col* col = *col_it;
uint8_t* address = (uint8_t*)image_address(image, col->x, row->y);
std::swap_ranges(address, address+getLineSize(col->w), col->data.begin());
}
}
}