static void DrawLatticeGouraudShading(CFX_DIBitmap* pBitmap,
CFX_Matrix* pObject2Bitmap,
CPDF_Stream* pShadingStream,
CPDF_Function** pFuncs,
int nFuncs,
CPDF_ColorSpace* pCS,
int alpha) {
ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
int row_verts = pShadingStream->GetDict()->GetInteger("VerticesPerRow");
if (row_verts < 2)
return;
CPDF_MeshStream stream;
if (!stream.Load(pShadingStream, pFuncs, nFuncs, pCS))
return;
CPDF_MeshVertex* vertex = FX_Alloc2D(CPDF_MeshVertex, row_verts, 2);
if (!stream.GetVertexRow(vertex, row_verts, pObject2Bitmap)) {
FX_Free(vertex);
return;
}
int last_index = 0;
while (1) {
CPDF_MeshVertex* last_row = vertex + last_index * row_verts;
CPDF_MeshVertex* this_row = vertex + (1 - last_index) * row_verts;
if (!stream.GetVertexRow(this_row, row_verts, pObject2Bitmap)) {
FX_Free(vertex);
return;
}
CPDF_MeshVertex triangle[3];
for (int i = 1; i < row_verts; i++) {
triangle[0] = last_row[i];
triangle[1] = this_row[i - 1];
triangle[2] = last_row[i - 1];
DrawGouraud(pBitmap, alpha, triangle);
triangle[2] = this_row[i];
DrawGouraud(pBitmap, alpha, triangle);
}
last_index = 1 - last_index;
}
FX_Free(vertex);
}
